Principles Of Organic Agriculture Research Articles

Assessment of the environmental sustainability of organic farming: Definitions, indicators and the major challenges

Halberg, N. 2012. Assessment of the environmental sustainability of organic farming: Definitions, indicators and the major challenges. Can. J. Plant Sci. 92: 981-996. The debate over agricultural sustainability continues due to the challenges of reducing externalities of intensive farming methods and preserving vital natural capital, but many definitions of sustainability are too wide to allow for a prioritized assessment. This paper uses a more narrow definition of agricultural sustainability focusing on the functional integrity of a system to highlight specific aspects of vital importance for the long-term resilience and reproducibility of agricultural systems. Key areas of resource sufficiency are also identified. Based on a review of scientific literature the relative sustainability of organic agriculture is assessed with a focus on environmental impact and resource use in Europe and North America. While there are many examples of organic agriculture with improved performance in terms of soil fertility and preservation of biodiversity, in other aspects - such as resource use per kilogram product - the difference to conventional farming is less important. The paper presents a framework for selection of indicators based on the principles of organic agriculture which may be used to monitor and improve the performance of organic agriculture with respect to functional integrity and resource sufficiency. The differences between comparable organic farms may be used for improving farm practices through a benchmarking process.

The making of an agricultural classic: farmers of forty centuries or permanent agriculture in China, Korea and Japan, 1911-2011

Few agriculture books achieve the status of ‘classic’. F. H. King’s book Farmers of Forty Centuries or Permanent Agriculture in China, Korea and Japan was privately published in Wisconsin, USA, in 1911. The book had an inauspicious start, and the longevity and acclaim that this book has since achieved must have been, then, barely conceivable. The author was dead, the book was incomplete, and there was no commercial publisher. Yet through a combination of perhaps luck and circumstance the book was ‘resurrected’ in 1927 by a London publisher, Jonathan Cape, who then kept it in print for more than two decades. The London issue of King’s book was favourably cited in the 1930s and 1940s by leading agriculture and organic agriculture writers including: Lord North- bourne, Eve Balfour, Viscount Lymington, Albert and Louise Howard in Britain; Ehrenfried Pfeiffer in Switzerland; Jerome Rodale in the USA; and Stanton Hicks in Australia. These endorsements served to entrench King’s book as a ‘classic’. Jerome Rodale reintroduced the book to a US audience with an edition published by his Organic Gardening Press, c.1949. King’s book arose out of his discontent with the views promulgated by the US Department of Agriculture (USDA), he differentiated the Asian agriculture he encountered as ‘permanent agriculture’, he provided a detailed account of the ancien regime organic agriculture of China, Korea and Japan, he called for a “world movement” for agricultural reform, and his book was been taken as a validation of the principles of organic agriculture. At least twenty six impressions of Farmers of Forty Centuries have been published in the past century, ten of these appeared during the first nine decades, while 16 have appeared in the past decade.

The need to breed crop varieties suitable for organic farming, using wheat, tomato and broccoli as examples: A review

It is estimated that more than 95% of organic production is based on crop varieties that were bred for the conventional high-input sector. Recent studies have shown that such varieties lack important traits required under organic and low-input production conditions. This is primarily due to selection in conventional breeding programmes being carried out in the background of high inorganic fertilizer and crop protection inputs. Also, some of the traits (e.g., semi-dwarf genes) that were introduced to address problems like lodging in cereals in high-input systems were shown to have negative side-effects (reduced resistance to diseases such as Septoria, lower protein content and poorer nutrient-use efficiency) on the performance of varieties under organic and low-input agronomic conditions. This review paper, using wheat, tomato and broccoli as examples, describes (1) the main traits required under low-input conditions, (2) current breeding programmes for organic, low-input agriculture, (3) currently available breeding and/or selection approaches, and (4) the benefits and potential negative side-effects of different breeding methodologies and their relative acceptability under organic farming principles.

Energy efficiency of organic pear production in greenhouses in China

AbstractThe development of organic protected cultivation taking place in densely populated areas has raised the question whether it is an environmentally friendly production system. The present study investigated energy consumption of organic pear production in two production systems, namely in traditional Chinese solar greenhouses and in the open field. In both production systems, energy output/input ratio and energy productivity were used as indicators to determine the energy efficiency; yield, cost of production, net economic return per land area unit and benefit/cost ratio were used to evaluate economic productivity. The analysis results indicated that energy input and energy output per land area unit in the solar greenhouse were higher than in the open field; whereas energy efficiency in terms of output/input ratio and energy productivity were lower in the solar greenhouse than those in the open field. However, if energy input sequestered in the protected structure was excluded in the solar greenhouse production system, energy efficiency was higher in the greenhouse system than in the open-field system. Our analysis further showed that the economic costs, the yield, cost of production, gross product value and net income per land area unit in the greenhouse were more than twice as high as those in the open field due to a higher tree density and a premium price. However, the production taking place in the open field used a great share of renewable energy and higher energy efficiency, which may comply more with the principles of organic farming than the greenhouse production system.

Strengthening US organic standards on animal health and welfare

AbstractOrganic livestock production has been increasing in the US, although it still merely constitutes a small fraction of total production. Its success will require detailed standards supported by scientific knowledge and consistent with organic farming principles. However, such standards, mandated under the Organic Foods Production Act of 1990, are yet to be fully developed. Regulations issued by the USDA's National Organic Program identify livestock health and welfare concerns that must be addressed in a farmer's organic farm plan (eg that there be appropriate housing). However, specifics regarding achievement of these goals are not provided in the form of clear standards for organic livestock production. This paper provides a new starting point to further the development of such standards. First, we outline a rationale based upon the legal context and state of the organic livestock industry detailing the reasons why development of these standards is timely. Second, using a review of existing organic and nonorganic national and international animal health and welfare standards, a search of available scientific research, and a consensus of key stakeholders, we identify areas in which organic standards should be readily adopted. We conclude by presenting one example of a plausible organic standard for each of four major US livestock categories: minimum space for feedlot beef cattle; prohibition of routine tail-docking in dairy cows; provision of perches for laying hens and prohibition of gestation crates for sows.

Assessment of environmental effects, animal welfare and milk quality among organic dairy farms

Within the organic dairy farming sector in Germany, traditional mixed farms with relatively low yearly milk yields of around 6000 kg per cow exist beside highly specialised grassland based farms with more than 9000 kg milk yield per cow and year. Specialisation and intensification are discussed critically within the organic sector as negative environmental effects are expected. In this study the potential environmental impacts of four different types of organic dairy farms are compared, based on a survey of 27 organic dairy farms classified by a percentage of grassland on total farm area and feeding intensity. The analysed environmental impact categories were energy consumption, climate impact, land demand, ammonia emissions, nitrate leaching, conservation of soil fertility, biodiversity, animal welfare and milk quality. Farms with a high feeding intensity tended to show ecological advantages in the impact categories climate impact and land demand. In contrast, low-input farm types showed positive environmental effects in the impact categories animal welfare, milk quality and ammonia losses. In an overall environmental index, the farm type “low-input mixed farming” showed the best results. The hypothesis that farms orientated on the traditional principles of organic farming tend to have less negative environmental effects even within the range of organic dairy farms is hereby confirmed. However, further research is needed to affirm the methodology used to quantify the environmental effects in the categories of animal welfare and milk quality. The results show that focussing only on the classical environmental impact categories, e.g. energy consumption and climate impact, may lead to different results than a more complex system approach that considers a broader range of relevant impacts and ecological benefits.

Conventionalisation of organic farming practices: from structural criteria towards an assessment based on organic principles. A review

Organic farming is widely perceived as being more environmentally friendly than conventional farming. As a form of sustainable agriculture, it receives substantial support from policy for its contribution to environmental protection as well as the provision of amenities such as biodiversity and cultural landscapes. Consumers are attracted to organic foods as they are produced without synthetic chemicals and comply with higher animal welfare standards. Although organic farming certainly has the potential to fulfil these expectations, studies have shown that some certified organic farms do not. Their practices comply with the regulations, but not with the principles of organic farming. This trend has been called ‘conventionalisation’ of organic farming. In this paper we review the studies that discuss the conventionalisation of organic farming, focusing on the farm level and on evidence from Europe. We argue that to strengthen organic farming’s transformative potential, the debate must move beyond its focus on the bifurcation between artisanal and conventionalised organic farms, so as to capture the full range of empirical heterogeneity. Our core argument is that to adequately understand the dynamics within organic farming and their potential impact on the ability of organic farming to fulfil the expectations of consumers and policy-makers, it is not sufficient to focus on structural changes. Instead, we need to assess whether or not the observed changes comply with the principles and values that are the fundament of organic farming.

Organic farming principles related to agro-ecological tropical smallholder livestock systems

Organic farming principles related to agro-ecological tropical smallholder livestock systems

Dry matter and fiber yields, and the fiber characteristics of five nettle clones ( Urtica dioica L.) organically grown in Austria for potential textile use

The aim of the field trial was to quantifiy yield, fibre content and fibre quality of 5 fibre nettle clones cultivated according to the principles of organic farming. The field trial started in 1997 and was organized in a randomised block design with 4 replications per clone. The field trial was situated in Neulengbach, Lower Austria. Since fibre nettle does not provide sufficient yields in the first cultivation year, the harvest of the second and third cultivation year (1998 respectively 1999) was used for calculation of yield per hectar and for the analysis of fibre content and quality. The dry matter yield (stalks) of the 5 nettle clones in the second cultivation year (1998) lies between 2,3 – 4,7 t/ha. Clone 1 and Clone 7 achieve the highest yields. This result was statistically significant. The dry matter yields of that year correspond with the dry matter yield achieved under extensive cultivation conditions (without nitrogen fertilizer) as described by SCHMIDKE ET AL. (1998). The dry matter yields of the third cultivation year (5,6 – 9,7 t/ha), however, are more than twice as high as those of the second cultivation year. They are also higher than the yields from the nitrogen intensive cultivation system described by VETTER ET AL. (1996) with 200 kg N/ha + 100 kg N/ha after the first cutting (per year; the fertilizer used was calcium ammonium nitrate). This large increase in yield in the third cultivation year is caused by an increase in the height (20 – 40 cm higher) and by the production of runners: the number of stalks per plot more than doubled in the third cultivation year. Additionally the undersowing of clover (Trifolium repens) seems to have had a positive effect on the growing of fibre nettle. The fibre yields lie between 335 – 411 kg/ha in the second cultivation year and between 743 – 1.016 kg/ha in the third cultivation year. Clones with a high dry matter yield have a low fibre content and vice versa. Therefore the differences between the clones in dry matter yield/ha and fibre content are balanced and there is no more difference between the fibre yield/ha of the clones. The fibre content after chemical processing lies in both the second and the third cultivation year between 8 – 16 % drymatter (stalks). This result confirms the maximum fibre contents reported in recent literature (DREYER ET AL. 1996, DREYER & DREYLING 1997, SCHMIDTKE ET AL. 1998, KOHLER ET AL. 1999, FRANCKEN-WELZ ET AL. 1999). Clone 8 and Clone 9 have the highest fibre content in 1998 (16,0 respectively 14,5 %), and Clone 8 (15,7 %) in 1999. There is no significant difference between the fibre quality (fibre strength, elongation, fibre fineness, lenght of fibre) of the five nettle clones. In general the fibre material is very inhomogeneous, which is caused by the differing consistence of the upper and the lower part of the stalk and by fibre processing methods. In principle, nettle fibres are suitable for textile use, however, the further developement of an economic and functional method for processing along with high yields is essential. The results show that higher yields and fibre contents were achieved in the third cultivation year under the described cultivation conditions of organic farming than other authors (BREDEMANN 1959, VETTER ET AL. 1996, DREYER ET AL. 1996, SCHMIDTKE ET AL 1998, FRANCKEN-WELZ ET AL. 1999). The yields of the third cultivation year are higher than the minimum for economic cultivation as defined by DREYER & DREYLING (1997). The cultivation of fibre nettle under the conditions of organic farming in Austria is therefore possible, as long as fibre processing plants and consumer demand exists. There is a need for further research in optimizing cultivation methods in organic farming (undersowing of leguminosae, manuring with slurry, row width, crop rotation) as well as in optimizing fibre processing methods for the quality of raw materials available and taking into account further processing into textiles (e.g. production of a pure yarn or a mixed yarn with cotton). There is also a need for research into possibilities to use fibres from different parts of the nettle plant for different purposes (e.g. textile and industrial uses).

Supplementing dairy steers and organically managed dairy cows with synthetic vitamin D3is unnecessary at pasture during exposure to summer sunlight

Use of synthetic feed additives, including synthetic vitamin D3 (D3) in the feed for cows and other ruminants, is not consistent with the international principles of organic farming. If dairy farmers wish to produce in accordance with the organic principles, production animals would be left with only their endogenous production of D3 from summer sunlight as a source of D3. To examine the impact of supplemental synthetic D3 from the feed on the D3 status of dairy cattle in organic production in Nordic countries, 20 high-yielding dairy cows and 30 dairy steers were divided into two groups: one supplemented with synthetic D3 in the feed and one not supplemented with synthetic D3. Vitamin D3 status of the animals was assessed by measuring the concentration of the liver-derived 25-hydroxyvitamin D3 (25OHD3) in plasma. Results showed that 25OHD3 concentration in plasma from dairy cattle as well as from steers decreased during winter for both supplemented and unsupplemented groups. Unsupplemented cows and steers had approximately 2 ng 25OHD3 per ml plasma during winter, whereas supplemented animals had between 10 (cows) and 30 (steers) ng/ml. During summer and autumn there was no additive effect of supplementing with synthetic D3 since unsupplemented and supplemented animals had the same D3 status at this time of year. In all cows summer concentrations of 25OHD3 were 20-25 ng/ml and in all steers 40-50 ng/ml plasma. The decrease in vitamin D3 status during winter indicates that cows and steers are able to store D3 only to a limited extent. The results also show that cows or steers fed supplemental D3 according to Swedish recommendation throughout the year are not able to maintain their summer value of 25OHD3 during winter.

Animal Welfare and Organic Aquaculture in Open Systems

The principles of organic farming espouse a holistic approach to agriculture that promotes sustainable and harmonious relationships amongst the natural environment, plants, and animals, as well as regard for animals’ physiological and behavioral needs. However, open aquaculture systems—both organic and conventional—present unresolved and significant challenges to the welfare of farmed and wild fish, as well as other wildlife, and to environmental integrity, due to water quality issues, escapes, parasites, predator control, and feed-source sustainability. Without addressing these issues, it is unlikely that open net-pen aquaculture production can be compatible with the principles inherent to organic farming.

The implementation of organic principles and values in the European Regulation for organic food

The paper is based on selected findings of the research project EEC 2092/91 (Organic) revision. It contributes to an improved understanding of the core ethical values associated with and principles of organic farming, analyses reference to such values in the European Regulation (EEC) 2092/91 and its ongoing revision, and contrasts them with current practice of organic agriculture. An analysis of differences in the implementation of the Regulation by national governments and private standards is presented. Ethical values are per se in need of interpretation, so the final section sets out procedural issues arguing for a deliberative model of decision-making, when aiming to achieve a coherent integration in the structure of a regulation.

An Observational Study on Early-Lactation Metabolic Profiles in Swedish Organically and Conventionally Managed Dairy Cows

The aim of this observational study was to compare indicators of energy balance in early lactation in organically managed dairy cows (OMC) and conventionally managed dairy cows (CMC) under field conditions. The diets of OMC and CMC differ as a consequence of the rules and principles of organic dairy farming. The study was based on clinical examinations and blood samples from cows within the range from 2 wk prepartum to 6 wk postpartum, collected from 20 organic and 20 conventional dairy farms with 3 visits at each farm. The farms were located in a southeastern area of Sweden and ranged in size from 45 to 120 cows. The blood parameters selected to reflect energy metabolism were nonesterified fatty acids, β-hydroxybutyrate, glucose, and insulin. At clinical examination body condition score was registered. The shape of the lactation curve in early lactation was modeled to assess potential differences that could explain the blood parameter profiles. The conventionally managed cows increased their milk yield faster than OMC within the first 2 wk of lactation. Blood nonesterified fatty acid concentrations were similar between the management types, but with a tendency of lesser concentrations in OMC, primarily in early lactation. Postcalving β-hydroxybutyrate concentrations were constantly lesser in OMC during the first 6 wk of lactation. An interaction between season and insulin concentration necessitated stratification on season. During spring the profiles overlapped, but there was a significant difference in the first 4 d post-calving, when organically managed cows had greater insulin concentrations and in d 30 to 34 when conventionally managed cows had greater insulin concentrations. During fall the profiles overlapped completely and there was no significant difference at any point in time. Glucose concentrations tended to decrease slightly postcalving followed by a gradual elevation to a concentration just under the precalving concentration during the study period. Body condition scores decreased slightly over the study period. No differences were found between the management types with regard to glucose concentrations or registered body condition score. In conclusion, the OMC did not show a greater extent of mobilization of body tissue than CMC as expressed by our study variables. Hence, OMC adjusted the production amount according to feed intake.

Farming strategies in organic dairy farming: Effects on breeding goal and choice of breed. An explorative study

Organic farming principles give rise to multifunctionality: different activities are combined at farm level to create ecological and economic synergies. These principles do however allow for different operationalisations and different farm development strategies, for example with regard to the use of external inputs or the decision whether or not to use advanced breeding technologies such as artificial insemination. Maintaining and improving diversity are therefore characteristic to organic farming. Since organic farming took off in the early 1990 s, many specialised dairy farms which tend to be more mono-functional in nature, have converted to organic, adding a new farming strategy to the diverse collection of farming strategies in organic dairy farming. All these farming strategies actually create different organic production environments for cows, which might result in different demands on selective breeding and breeding technology. This differential demand was explored in a survey, among 151 organic dairy farmers, on general farm strategy, milk production, breeding goal, choice of breed and approach to reproduction. Farmers were divided into one of two groups on each of three strategic options: a) diversification in farm business—Specialised Dairy Farming vs. Multifunctional Farming; b) intensity of milk production—Low Input vs. High Input Farming and c) naturalness of breeding—Farming with Artificial Insemination vs. Farming with Natural Service. A pair-wise comparison within each strategic option showed that each pair differed significantly with regard to farm characteristics, farm goal and animal production goals. However, there were only minor or no significant differences within each pair with regard to overall breeding goal. For each strategic option, big differences were found within each pair as regards preferred cattle breeds and crossbreeds. Farmers in the Specialised Dairy Farming and High Input Farming groups preferred milk-type cattle (Holstein and Holstein crossbreeds), while farmers in the Multifunctional Farming and Low Input Farming groups preferred various native Dutch breeds. But even farmers with a similar strategy (within one group) differed strongly in their choice of breeds and crossbreeds. These results indicate that organic farmers are going through process of learning by doing, experimenting as they search for breeds or crossbreeds that are optimally suited to their farm environment and that best agree with their farm development strategy. In this, the growing preference for keeping bulls on the farm for natural service is remarkable.

Transition to large-scale organic vegetable production in the Salinas Valley, California

Studying the management strategies suited to large-scale organic production, particularly during the mandated 3-year transition period from conventional management, is a unique research challenge. Organic production traditionally relies on small, diverse plantings and complex management responses to cope with soil fertility and pest pressures, so research should represent decision-making options of an organic grower at the farm scale. This study analyzes crop, soil, pest and management changes during the organic transition period on two ranches (40 and 47 ha) in the Salinas Valley, California in cooperation with a large conventional vegetable producer, Tanimura and Antle, Inc. Permanent transects were established across the two ranches at the onset of adoption of organic practices, and soil and plants were sampled at harvest of almost all crops, while all management operations were recorded by the co-operator. The ∼10 ha blocks were divided into many small plantings, and 17 different cash crop and cover crop species were planted during the transition period. Management inputs consisted of a range of organic fertilizers and amendments, sprinkler and drip irrigation, cultivation and hand-hoeing, and several types of organic pesticides. Results from the 3-year period followed these general trends: increase in soil biological indicators (microbial biomass and arbuscular mycorrhizae), low soil nitrate pools, adequate crop nutrients, minor disease and weed problems, and sporadic mild insect damage. Multivariate statistical analyses indicated that some crops and cultivars consistently produced higher yields than others, relative to the maximum yield for a given crop. Multi-factor contingency tables showed clear differences in insect and disease damage between crop taxa. Although Tanimura and Antle, Inc. used some of the principles of organic farming (e.g., crop diversity, crop rotation, and organic matter (OM) management), they also relied on substitution-based management, such as fertigation with soluble nutrients, initially heavy applications of organic pesticides, and use of inputs derived from off-farm sources. Their initial production of a large number of crop taxa in small plantings at staggered intervals proved to be an effective strategy for avoiding risks from low yields or crop failure and allowed them to move towards a smaller number of select, successful crops towards the end of the transition. This study demonstrates the feasibility of large-scale producers to transition to organic practices in a manner that was conducive to both production goals and environmental quality, i.e., increased soil C pools, low soil nitrate, and absence of synthetic pesticides.

Soil microbiological and biochemical properties for assessing the effect of agricultural management practices in Estonian cultivated soils

A set of soil microbiological and biochemical properties was used to assess the influence of agricultural practices such as rotation, usage of pesticides, and fertilizers on the three most widespread soil types (Calcaric Regosols, Calcaric Cambisols and Stagnic Luvisols) in the fields of horticultural farms throughout Estonia. Microbial biomass, dehydrogenase and alkaline phosphatase activity were significantly higher in Calcaric Regosols, whereas measured soil chemical parameters showed practically no difference among soil types. Multivariate exploratory analysis of soil biochemical and microbiological parameters clearly distinguished soils with different management practices when the effect of soil type was taken into account in data analysis. Activity of dehydrogenase, potential nitrification, N-mineralisation, and microbial biomass contributed most strongly to the differentiation of soils from differently managed fields. Soils managed according to organic farming principles were generally characterized by elevated microbiological parameter values, but at the same time the variation of those parameters among soils from these fields was also highest. The application of organic manure positively affected microbial biomass, N-mineralisation, potential nitrification, dehydrogenase and acidic phosphatase activity. Data analysis indicated that the amount of mineral nitrogen fertilizers added over time has a stronger effect on microbial biomass than the amount added in a given year. Legume-based crop rotation increased soil respiration and microbial biomass.

A CRITICAL ANALYSIS OF THE AGRONOMIC AND ECONOMIC SUSTAINABILITY OF ORGANIC COFFEE PRODUCTION

Organic coffee is one of several types of speciality coffees selling at a premium over mainstream coffees because of distinct origin and flavour, environment-friendly production or socio-economic concerns for the smallholder coffee growers. The demand for organic coffee in Western Europe, North America and Japan exceeds the present supply, which is still small (<1% of annual world production). More than 85% of organic coffees come from Latin America and practically all is (washed) arabica coffee. The production of certified organic coffee follows the principles of organic farming developed in Europe and the United States out of concern for the perceived negative effects of conventional high-input agriculture on health and environment. It claims superior ecological sustainability in combination with sound economic viability. A rather complex and expensive system of certification has to be passed before such coffees can be sold as truly organic. Growers adhering to the strict rules of organic coffee production may to some extent share the concern of the health- and environment-conscious consumers, but they are motivated primarily by the economic benefits from the premium received for certified organic coffee. Nevertheless, there appears to be considerable injustice between the extreme preconditions demanded for ‘organics’ by the largely urban consumer of the industrialized world and the modest rewards received by the organic coffee growers for their strenuous efforts. From an agronomic point of view, there is also considerable ground for criticism on the principles of organic farming when applied to coffee. For instance, to sustain economically viable yield levels (1 t green coffee ha−1 year−1) large additional amounts of composted organic matter will have to come from external sources to meet nutrient requirements (especially N and K). Most smallholders will be unable to acquire such quantities and have to face declining yields. Organic farming does not necessarily reduce incidence of diseases and pests below economically harmful thresholds, while the humid conditions of heavily shaded coffee may actually stimulate the outbreak of others. These and other aspects peculiar to the preconditions of organic coffee production are addressed in this review. It is concluded that the concept of organic farming in its strict sense, when applied to coffee, is not sustainable and also not serving the interests of the producer and consumer as much as the proponents would like us to believe. On the other hand, agronomically and economically sustainable coffee production is feasible by applying best practices of crop production and post-harvest processing.

The Use of Herbs in Pastures: An Interview Survey Among Bio-Dynamic and Organic Farmers with Dairy Cattle

Lack of knowledge about the effects of herbs in pastures and the frequency of their use by today's organic farmers has limited the development of new methods to improve animal health compatible with organic farming principles. Understanding farmers' agricultural practices is an early step in a participatory research process. With this in mind, we conducted a two-tiered, semi-structured survey of Danish organic farmers with dairy cattle to begin documenting their practices. Out of 350 farmers, 255 completed a mailed questionnaire – a response rate of 73%. Of these participating farmers, 66 (26%) confirmed their use of herbs in pastures. Caraway was sown at an average rate of 500 g of seed per hectare by 60 (91%). Of these, 32 used solely caraway, while 7 used it in combination with parsley. Twenty-one used caraway together with herbs other than parsley. Six used one or more herbs, not including caraway, such as chicory, chervil, dill, fenugreek, great burnet, and salad burnet. Further details concerning cultivation, convictions, observed effects, and information sources were obtained through telephone interviews. The results of this study would indicate that more research in this field is called for.

Animal breeding in organic dairy farming: an inventory of farmers' views and difficulties to overcome

Currently, most organic dairy farmers in the Netherlands use conventional breeding methods and production stock. In view of the organic objective of closed chains, organic dairy farmers discussed in workshops the desirability and practical merits of different possible scenarios for realizing breeding programmes that are more in line with organic farming principles. Generally, farmers concluded that there is a need for organic breeding practices to support the sector's credibility towards consumers and society. The first step in developing organic breeding practices is to ban the indirect use of artificial embryo reproduction technologies, but there was no consensus on which selection strategies best fit organic principles. Most organic farmers preferred to uphold the familiar breeding structure of index selection and artificial insemination. Since the scale of organic farming remains small, a distinct breeding structure for organic farming will be difficult to achieve. Customizing conventional breeding values and an international co-operation between breeding programmes may be (temporary) solutions. In organic farming, farm-based regional breeding strategies based on kin-breeding may be more appropriate but farmers lack knowledge of these practices. Also decision-makers need more knowledge on the influence of the (yet not quantified) genotype × environment interaction on the estimation of breeding values for sires when considering organic and conventional farming as different environments. Substantial genotype × environment interaction would support selection under conditions representative for organic environments. It was concluded that realizing distinct organic breeding practices will take time and will require institutional changes.

Traditional agriculture in Iran and development challenges for organic agriculture

Iran occupies a vast area of land with diverse climatic conditions, encompassing a variety of production practices and rich biological diversity. Traditional agriculture was widespread less than 50 years ago and is still appreciated by some farmers (called 'ignored organic farmers') in Iran. However, such practices have been ignored in the context of current concepts of organic agriculture. It may be impossible or not economically viable to return Iran to traditional production systems, but the long history of environmentally safe production systems could provide an incentive to increase development of organic agriculture and sustainable production systems in Iran. It will not be a question of whether the organic movement continues to grow in Iran (as it has in other countries), but meeting the challenges required to keep pace with this growth without fundamentally challenging or threatening the overall principles of organic agriculture.