Paddy Field Area Research Articles

Effects of fertilizer of calcium silicon magnesium potassium on the dynamics of soil acidity and exchangeable base cation in paddy field of southern China

Soil acidification of large areas of paddy fields in southern China has become an important problem in rice production. Therefore, how to ameliorate or remedy the acidifying paddy soil and to exposit its mechanism has important theoretical and practical significance for rebuilding healthy soils and guaranteeing national food security. Although lime has already been extensively used to remedy acidified soils, long-term application of a large amount of lime would not only cause the soil to harden, but also disturb the balance between calcium, potassium and magnesium in the soil. Given the advantages of lower solubility and comprehensive nutrient supply, fertilizer of calcium silicon magnesium potassium (CSMP) may be used as an alternative. The aim of this study was to clarify the functions of CSMP and its effects on soil acidification in paddy fields. A four-year field experiment was conducted to investigate the dynamics of soil pH, exchangeable acidi-ty, exchangeable base cation and available silicon, as well as 0~30 cm pH buffer capacity (pHBC), net base production under CSMP fertilization in the paddy soil. There were five treatments, i.e. CK (traditional fertilization practice of the local farmers), treatment I (CK plus 750 kg·hm-2 CSMP); treatment II (CK plus 1125 kg·hm-2 CSMP), treatment III (CK plus 1500 kg·hm-2 CSMP), and treatment IV (CK plus 1875 kg·hm-2 CSMP). The results showed that the traditional fertilization practice of the local farmers resulted in a decline of soil pH, soil exchangeable base cation and base saturation year by year, but soil exchangeable acid was increased with year. Conversely, CSPM fertlization significantly raised soil pH, with the magnitude of increases positively depending on the number of application times or application rate. Continuous and repeated application of CSMP effectively promoted the accumulation of exchangeable base cation and the consumption of soil exchangeable acid in paddy soil, especially for the accumulation of soil exchangeable Ca2+, Mg2+ and the consumption of soil exchangeable Al3+. Furthermore, the more amount of CSPM application resulted in the more accumulation or consumption, but with relatively slower rate. The exchangeable base cation and alkali released by CSMP contributed 108.8% to the total reduction of soil exchangeable acid, suggesting that it was the main path to reduce soil exchangeable acid. Meanwhile, CSMP application improved soil acidity in paddy field, with the content of available silicon increased year by year and the increase amplitude became larger with the more amount of CSMP application. The traditional fertilization of local farmers resulted in soil acidification, with a acidification rate was 2.86 kmol H+·hm-2·a-1. CSMP application could effectively control soil acidification, producing a lot of alkalinity with net alkalinity production of 9.93-13.82 kmol OH-·hm-2·a-1. CSPM could release Ca2+, Mg2+ and alkali, which would mitigate soil acidification in paddy fields.

Mitigasi emisi gas rumah kaca melalui penerapan irigasi intermittent di lahan sawah beririgasi

Mitigasi Emisi Gas Rumah Kaca (GRK) melalui penerapan irigasi terputus (intermittent) di lahan sawah beririgasi telah dilakukan. Tujuan penelitian ini adalah menghitung besarnya potensi mitigasi melalui perhitungan laju emisi GRK dan Global Warming Potential (GWP) pada penerapan irigasi intermittent dan konvensional. Pengambilan sampel GRK (CH4, CO2 dan N2O) dilakukan di Daerah Irigasi Mrican Kanan Jombang pada petak tersier TB 1 Ki, TB 2 Ki, TL4 Ka dan petak konvensional sebagai kontrol. Sampel diambil pada 3 fase pertumbuhan padi yaitu fase vegetatif, primordia dan pemasakan buah dalam box penangkap GRK. Sampel dianalisa di laboratorium dengan kromatografi gas (GC). Hasil pembacaaan fluks GRK ditujukan untuk mendapatkan nilai Emisi GRK dan GWP agar dapat dilihat penurunan emisi GRK pada perlakuan pemberian air secara terputus. Penelitian ini menunjukkan bahwa dengan penerapan irigasi intermittent dapat menurunkan emisi CH4 sebesar 33,18% dan potensi pemanasan global GRK sebesar 34,9% jika dibandingkan dengan penerapan irigasi konvensional (tergenang).

Soft Clay Soil and Organic Soil Amendment Effects on Soil Organic Carbon in Paddy Cultivation Area

Soft clay soil has become a major problem in paddy cultivation area. Nearly half of the total paddy field in Kedah State, Malaysia cannot be utilized for paddy cultivation because of soft clay soil. The problem is related to the presence of weak hardpan structure that permits the soil to experience continuous wet condition. The soil also causes in the alteration of many processes soil organic carbon sequestration and turnover, but the main effect on the land is decrease in soil fertility. To investigate the effects of soft clay soil on soil organic carbon content, stock and change rate, the trial has been conducted in Alor Senibong paddy field area in Kedah, Malaysia examining the problematic paddy field that associated with soft clay soil problem. Hasil Tani Organic Compound (HTOC) was an organic soil amendment that used to enhance soil organic carbon in this study. Paddy field with the presence of soft clay soil showed a low soil organic carbon content and stock around 0.67% and 1.01 t·ha-1, respectively (depth 0-15 cm). The reduction of soil organic carbon content in soft clay soil was likely because of the waterlogged soil environment, the stability of soil aggregates and decline in humification process which then reduced soil organic carbon input. After being treated with HTOC, soil organic carbon content and carbon stock in soft clay soil have significantly increased by 0.67-3.14% and 1.01-4.76 t·ha-1 (depth 0-15 cm), respectively, yielding a mean monthly carbon change rate of 4.36 g C kg−1·mth.−1 (depth 0-15 cm). As whole, the succession of HTOC application to improve soil organic carbon content in this study could be employed in other paddy field areas that associated with soft clay soil problem.

NILAI TUKAR PETANI PADI SAWAH DI KECAMATAN TOMPASO BARU KABUPATEN MINAHASA SELATAN

This study aims to determine the exchange rate of wetland rice farmers in New Tompaso District, South Minahasa Regency. This research was conducted for three months from September to November 2018. The data used were primary and secondary data. Primary data collection through direct interviews with 39 respondents of wetland rice farmers who were randomly determined. Interviews using a questionnaire prepared previously. Secondary data was collected from the Tompaso Baru District office in the form of a profile of research location, and from the internet through google searching in the form of journal articles that relevant to this research. Furthermore, the data is calculated using the formula for the exchange rate of lowland rice farmers. The results of the research that have been conducted show that the exchange rate of lowland rice farmers with an area of equal and less than 1 ha is 68.32, which means that rice farmers do not have other jobs, the farmers are unable to meet their family's daily needs. While the exchange rate of paddy rice farmers with a land area of more than 1 ha is 101.44, meaning that if the paddy farmers do not have other jobs, then the farmer is still able to meet the daily needs of his family. Thus to meet the daily needs of his family, for lowland rice farmers who only depend on the source of income from rice farming business, they must have a minimum is greater than 1 hectare of paddy field area.*eprm*

Produktivitas dan Luas Lahan Minimal Petani Padi Sawah Lebak di Kabupaten Ogan Ilir

Sari et al, 2018. Productivity and an Enlarge Minimum Land Area of Paddy’s Farmers in Swamp Land of the Ogan Ilir Regency. JLSO 7(2):South Pemulutan is one of the sub-districts in Ogan Ilir Regency which has swamp paddy fields potential to be developed. Unfortunately, the use of production factors which applied by the farmers has not been maximized. Therefore, proper management by using production factors efficiently and effectively can increase productivity and maintain the sustainability of their farm. Moreover, the aims of this research were (1) to analyze the factors which affect the low productivity of the swamp paddy fields, (2) to calculate the percentage of an income of the swamp paddy fields’ farmer which can fulfill their household outcome, (3) to calculate the minimum land area of the swamp paddy fields of the farmer. The method were used in this research was survey method. The sample of the farmers which taken in this study were 30 farmers from 187 farmers which works on swamp paddy fields in Lebak Pering village. The data was gathered consist of the primary data and the secondary data. The result of this research showed (1) factors which extremely affected toward swamp paddy fields productivity in Lebak Pering village was the largest of the area, seed variety, the used of urea fertilizer, the experiences of the farmer, while those that have no effect are the used of SP-36 fertilizer, NPK fertilizer and then the pesticides. (2) The contribution of swamp paddy fields farmers’ income to farmers' consumption expenditure were 60.28%. (3) The minimum land area that suggested to be cultivated by the farmer is 1 hectare and if the farmer only relies on their swamp paddy fields farming, then the minimum land area that suggested to be raised by the farmer is 1.66 hectares.

Combine harvesting efficiency as affected by rice field size and other factors and its implication for adoption of combine contracting service

ABSTRACTSmall combine harvesters have become popular in SE Asia recently, but small rice fields appear to limit its field operation and hence its wide adoption by smallholders. Combine harvesting efficiency, the area of paddy field harvested per unit time, was determined for 6 seasons in Central Lao PDR for over 400 fields varying in size and toposequence position, rice varieties grown, crop establishment methods and crop conditions particularly lodging at harvest. Combine harvesting efficiency was commonly about 3 ha/day in small fields of less than 1000 m2 and increased with the increase in field size up to 5 ha/day in the size of about 2000–3000 m2, but not beyond this range. Lower efficiency was also found in wet season than dry season, and also crops established from broadcasting compared with transplanting and drill seeding, at least partly because broadcasted crops tended to lodge more often than crops established from other methods. Photoperiod sensitive, long duration varieties grown in lower field positions also tended to have lower combine efficiency. Using the data obtained in this work, net return of combine adoption to farmers was estimated for different combine charge fees and yield levels. Increasing combine harvesting efficiency by 50% with increased field size would increase the net income of combine harvesting contractors by around 50% at current charges, allowing them to reduce the combine harvesting fees they charge. This would aid the adoption of combine harvesting services.

Estimasi Populasi Tokek Rumah, Gekko gecko (Linnaeus, 1758) di Kaki Gunung Karang, Kabupaten Pandeglang, Provinsi Banten, Jawa Bagian Barat

ABSTRACT On CoP 18 which will be held in Sri Lanka in 2019, house gecko was proposed to be uplisted up listed from the non-appendix status of CITES to be included the list of CITES appendix II on the reasons that the hunting of the reptile was very large and uncontrolled. In order to anticipate the up listing of house gecko status, LIPI as a Scientific Authority in Indonesia recommended quota for house gecko in 2019 to be 1,800,000 individuals. To see that such a quota does not have a negative impact on the population of house gecko in the wild, a survey was conducted by using the close questioner system method by visiting housing in a village; where in this survey the villages were located at the foot hill of Gunung Karang, Pandeglang Regency, Banten Province. The survey was conducted on March 18 to April 1, 2019. The total number of villages visited was 8 villages which were divided into three sub-districts. The total area surveyed in 8 villages was around 94.5 hectares. The total number of houses visited was 740 houses; the total number of houses that contained the house gecko was 211 houses. The total number of house gecko by interviewed was 260 individuals, while the total number of house geckos by observed was 88 individuals. The survey results obtained an average population density of house gecko by interviewing eight villages was 3.66 individuals/hectares, while the observation results were 1.15 individuals/hectares. The approach to the average population density of houses gecko by interviewing with the results of 3.66 individuals/hectares was assumed to be the density that was close to the logical number. Extrapolating the density of house geckos in Pandeglang Regency which covers an area of 229,071 hectares excluded paddy field area was considered to be inhabited by house gecko, so the extrapolation of the number of house geckos in Pandeglang Regency is around 838,399.86 individuals. Keywords: Gekko gecko, house gecko, Java, population

Responses of greenhouse-gas emissions to land-use change from rice to jasmine production in subtropical China

We studied the impacts of an increasingly common change in land use from paddy field to jasmine fields on the emission of greenhouse gases (GHGs), which have supposed the transformation of more than 1200 ha only in the last decade in the surroundings of Fuzhou city in response to economic changes. The possible increases that this can suppose constitutes and environmental concern in China. We studied areas dedicated to rice crop that have been partially converted to jasmine cultivation with some parts still kept as rice fields. Emissions of CO2, CH4 and N2O varied significantly among the seasons. CO2 and CH4 cumulative emissions and the global-warming potential (GWP) of these emissions were significantly lower in the jasmine than the paddy field. N2O emission, N2O cumulative emission, however, were higher in the jasmine than the paddy field, despite in some concrete studied periods the differences were not statistically significant. The total decrease in GHG emissions from the conversion from rice to jasmine production was strongly influenced by the indirect effects of various changes in soil conditions. The expected changes due to the great differences in water and fertilization use and management and organic matter input to soil between these two crops were in great part due to modified soil traits. According to structural equation models, the strong direct effects of the change from rice to Jasmine crop reducing the emissions of CO2 and N2O were partially decreased by the indirect effects of crop type change decreasing soil pH and soil [Fe2+] for CO2 emissions and by decreasing soil salinity and soil [Fe3+] for N2O emissions. The negative effects of the crop conversion on CH4 emissions were mostly due to the globally negative indirect effects on soil conditions, by decreases in soil salinity, water content and [Fe2+]. Soil salinity, water content, pH, [Fe2+], [Fe3+] and [total Fe] were significantly lower in the jasmine than the paddy field, but temperature had the opposite pattern. CO2 emissions were generally correlated positively with salinity, temperature, and water content and negatively with [Fe3+] and [total Fe] in both fields. CH4 emissions were positively correlated with salinity, temperature, water content and pH in both fields. N2O emissions were positively correlated with temperature and were negatively correlated with water content, pH, [Fe2+], [Fe3+] and [total Fe] in both fields. CO2 was the most important GHG for the GWPs, and the total GWP was significantly lower for the jasmine than for the rice cropland field. The change in the land use in this area of paddy fields will decreased the global GHG emission, and the effect on the GWPs was mostly due to changes in soil properties.

Threats of sedimentation to agricultural land due to land use and degradation of watershed physical environmental

<p class="abstract"><strong>Background:</strong> The Lake Lindu sub-watershed has experienced environmental damage, mainly as a result of various activities of the surrounding community who are less aware of the principles of environmental sustainability. This study aims to determine the effect of land use area and environmental physical conditions on sedimentation and water debit in the Lake Lindu sub-watershed.</p><p class="abstract"><strong>Methods:</strong> This research was carried out by implementing survey and non-experimental method at 3 rivers: Langko (P1), Wongkodono (P2), and Kati (P3). The dependent variable in this study is the area of land use (area of farm, shrub, paddy field, forest, and settlement) and the physical condition of the environment (the width of the catchment area and annual average rainfall). Then, the independent variables are sedimentation and water debit. Statistical analysis used is a multiple regression model. </p><p class="abstract"><strong>Results:</strong> The results of this study are that the wider shrub (X<sub>2</sub>) reduces the sedimentation (Y<sub>1</sub>) and increases the water debit (Y<sub>2</sub>). Each addition of one shrub unit will reduce the sediment by 0.208 mg/L and affect the water debit of 0.258 m<sup>3</sup>/ s-1. The regression equation is Y<sub>1</sub>=185.903 - 0.208X<sub>2</sub>-587.269X<sub>8</sub> and Y<sub>2</sub>=6.854+0.258 X<sub>2</sub> - 71.708 X<sub>8</sub>. As for the coefficient of the shape of the river (X<sub>8</sub>). The bigger the shape of the river, the smaller the average of the water debit. Thus, each reduction of one coefficient unit of the river shape will affect the water debit of 71,708 m<sup>3</sup> /s-1.</p><p class="abstract"><strong>Conclusions:</strong> The significant predictor factors for sedimentation and river water debit are the shrubs and the coefficient of the river shape.</p><p> </p>

東北水田農業地帯における「非協業」的集落営農組織の 機能に関する一考察

東北水田農業地帯における「非協業」的集落営農組織の 機能に関する一考察

Water Quality Influences Fish Occurrence in Peat Swamp Forest and Its Converted Areas in North Selangor, Malaysia

Tropical peat swamp forest (PSF) is one of the most endangered ecosystems in the world. However, the impacts of anthropogenic activities in PSF and its conversion area towards fish biodiversity are less understood. This study investigates the influences of water physico-chemical parameters on fish occurrences in peat swamp, paddy field and oil palm plantation in the North Selangor peat swamp forest (NSPSF), Selangor, Malaysia. Fish and water samples were collected from four sites located in the peat swamps, while two sites were located in the paddy field and oil palm plantation areas. Multivariate analyses were used to determine the associations between water qualities and fish occurrences in the three habitats. A total of 1,382 individual fish, belonging to 10 families, 15 genera and 20 species were collected. The family Cyprinidae had the highest representatives, followed by Bagridae and Osphronemidae. The most abundant species was Barbonymus schwanefeldii (Bleeker 1854), while the least abundant was Wallago leerii Bleeker, 1851. The paddy field and oil palm plantation area recorded significantly higher fish diversity and richness relative to peat swamp (p 0.05), but was significantly different from the peat swamp (p<0.05). However, no water quality parameter was consistently observed to be associated with fish occurrences in all of the three habitats, but water temperature, NH3-N, Cl2, SO4, and EC were at least associated with fish occurrences in two habitats studied. This study confirmed that each habitat possess different water quality parameters associated with fish occurrences. Understanding all these ecological aspects could help future management and conservation of NSPSF.

PERTIMBANGAN KEBERLANJUTAN DALAM PERUBAHAN PERUNTUKAN LAHAN PERTANIAN DI KABUPATEN BEKASI

&lt;em&gt;Changes in land use require consideration of the sustainability of the area. The principle of a triple bottom line in sustainable development must be applied. This research builds a sustainable development model in Bekasi Regency. The secondary data used is from the Central Bureau of Statistics of Bekasi Regency. The variables used are the average of rainfall, the number of population, the number of job seekers, the area of rice field, the area of rice harvest, the production of wetland rice, and the production of field rice as independent variable and GDP as the dependent variable. Consideration of the selection of variables by looking at the economic, social and environmental aspects that are aspects that determine the sustainability of development. Data analysis was done by using multiple linear regression. The results showed that the population, paddy field area, paddy field production have a significant positive effect to PDRB, while the number of job seekers, paddy field area, and paddy field production significantly negatively. The average variable of rainfall has no significant effect to GRDP. Taken together (simultaneously) all the independent variables have a significant effect on GRDP.&lt;/em&gt;

The impacts of paddy field conversion and climate change on rice production in Tegal Regency, Indonesia

Land conversion is one of the problems in agriculture because it decreases the number of productive lands. This condition is exacerbated by climate change phenomenon. This research aimed to identify the climate change impact on paddy field area conversion and rice production in Tegal Regency, Indonesia. The research was conducted by interpreting and classifying satellite image data as well as analyzing land area changes and rice production. Support Vector Machine (SVM) was used as the supervised classification method followed by correlation tests. The results indicated paddy field area decreased in 2009-2015, from 39,365.3 to 36,629 ha. While climate conditions in 2009-2015 were fluctuating, but rice production from 2009 to 2015 increased from 350,116 to 382,161 tons. The changes of paddy field areas and climate parameters did not affect rice production (Rainfall: r = 0.32, P>0.05; Temperature: r = - 0.05, P>0.05; Humidity: r = 0.09, P>0.05, n = 7). However, paddy field conversion and climate condition changes must be addressed to optimize and sustain the rice production in Tegal Regency.

Identifikasi Lahan Pertanian Pangan Berkelanjutan di Kabupaten Gowa, Sulawesi Selatan: Zonasi Lingkup Kawasan Mamminasata Menggunakan Pendekatan MCDM

The protection of agricultural land is very important to be studied scientifically considering the rapid growth of the population so that the possibility of land use conflict is very high. The main purpose of this research is to identify and inventory agricultural land of food especially existing rice-paddy fields to find zonasi agricultural land for sustainable foodcrops (ALSF) and agricultural reserved land for sustainable foodcrops (ARLSF)) with the level of threat from the transfer function in Gowa Regency area of hinterland Mamminasata, South Sulawesi. This study used a multiple criteria decision making approach with purpose mapping function of ALSF and ARLSF. The generic attributes, from: the biophysical aspects of the land (altitude, sizes of soil cracking, length of rice-field in slope landscape unit, proportion of paddy field area, top soil thickness), and socio-economic aspects (population density, population growth rate, demand for paddy field, productivity of paddy fields, equilibrium of paddy field), and policy aspects (local regulations status, detailed spatial plan status, type of irrigation networks). While the scenario of zonation of ALSF and ARLSF is used the criteria of distance from the provincial capital (Makassar) and the district capital (Sombaopu), the status of the rice-paddy field equilibrium and the trend pattern of percentage of space requirement. The results of the research shows that the existing position of paddy field is identified as ALSF and ARLSF zonation currently 24,210 Ha. The level of vulnerability of land conversion, which is in a "safe" position of 15,407 Ha (63.64%), and "threatened" of 8,803 Ha (36.36%). The prediction of productivity potential is related to the area of land that can be managed optimally in the vulnerable time up to the year 2020 covering 19,499 Ha (80.54%), and subsequently, by 2040 the area will shrink to only 10,173 Ha (42.02%).

Spatio-Temporal Analysis of Land Use/Land Cover Changes in an Ecologically Fragile Area—Alappuzha District, Southern Kerala, India

Concomitant with careless human interference in the delicate environmental balance, the Earth’s surface is witnessing a variety of changes in land use and land cover (LULC). Acquisition of a sound understanding of LULC is an important aspect of maintaining a sustainable, benign, healthy environment. The present work highlights a spatiotemporal study on the LULC features of Alappuzha District, an ecologically fragile area in southern Kerala, a state in South India. The study area faces diverse environmental challenges including decline of landforms, rising sea levels, population expansion and anthropogenic encroachments on the ecological balance. This investigation compiles an audited account of the modifications, in each class of LULC, using geospatial technologies. We interpreted satellite imagery from the Landsat 8 and the Landsat multispectral scanner for the years 1973 and 2017. The LULC aspects were categorized into seven classes: waterbody, waterlogged area, mixed vegetation, built-up land, uncultivated area, paddy field and sandy area. Our findings affirm that the expansiveness of the built-up land area is directly proportional to the growth of the population. Advanced technologies such as remote sensing and geographic information system accentuate alterations in land use patterns over time and the extent to which the changes affect the human population and the natural habitat. We verified the results of our research by assessment of accuracy and ground truth confirmation of the LULC features.

Implementation of Salibu Rice Cultivation Technology in Percut Sei Tuan Sub-District

Percut Sei Tuan Sub-district is an agricultural production center in Deli Serdang Regency. The area of irrigated paddy field in Percut Sei Tuan Sub-district comprises of 3,610 ha and 1,616 ha of non-irrigated paddy field. The farmer association groups (tani mitra) consisting of Farmer Group "Pasar II" and Farmer Group "Mulia" are located in Tanjung Selamat Village. Much land in Tanjung Selamat Village has been converted into an industrial area; previously the paddy field area reached 600 hectares, but only 200 hectares remains now. The Farmer Groups "Pasar II" and "Mulia" consist of 30 and 76 farmers with paddy rice field area of 25 ha and 23 ha respectively, and rice productivity amounts to 6.2 tons/ha and 7 tons/ha. The problems of the farmers were the high land use conversion resulting in reduced harvested area and only a few farmers change the local location-specific organic materials into organic fertilizers independently. The purposes of this community service activity were to increase the farmers' income through the implementation of salibu technology whereby farmers can harvest 2-3 times in one planting and to increase the farmers’ understanding and knowledge about the manufacturing process of organic fertilizer and pesticide. The solutions offered were including counseling, a training and plot demonstration on salibu technology, and the production of bokashi straw. The outcome of this IbM has resulted in several things: bokashi of compressed hay with Local Microorganism from cattle intestine and Trichoderma, organic pesticide products based on Corynebacterium and Trichoderma, and farming analysis with salibu technology.

ANALISIS PERUBAHAN TUTUPAN LAHAN DAS TONDANO, SULAWESI UTARA SELAMA PERIODE TAHUN 2002 DAN 2015

Monitoring land cover change is important to be done in order to understand changing mechanism and to model impacts of the change to environment and ecosystem in different scale. Research on change detection of the Tondano watershed for the period of 1989-1999 showed that the land cover has changed due to agricultural activity and urbanization (Prenzel, et al, 2006). Land cover change of the Tondano Watershed contributed to the flooding and landslide disasters in Minahasa and Manado in the early of 2014. This research was conducted to compare land cover of the Tondano Watershed between the period of 2002 and 2015 using remote sensing data and Geographical Information System (GIS). Change detection method, post classification comparison was used to gather information on land cover change in the Tondano Watershed. Results showed that there was a significant change in the land cover within thirteen years. There was a decrease of forest, paddy field and volcano areas and an increase of agriculture, residential and water body areas. Forest has been converted to dry land agriculture; paddy field area has been converted to agriculture and residential areas. An increase of residential area was caused by conversion of agricultural and paddy field areas located nearby Manado City.

Modelling and mapping natural hazard regulating ecosystem services in Sapa, Lao Cai province, Vietnam

Land use change due to the development of agriculture and community-based tourism has resulted in an increase in natural hazards (e.g. erosion and landslides) that affect sustainability in the Sapa mountainous area in northern Vietnam. Natural hazard regulating ecosystem services have protected the local people from the destruction of their villages, goods and natural resources, especially in the rainy season. However, it is difficult to identify which kinds of anthropogenic constructions support a co-production of regulating services in human-influenced social–ecological systems and in which specific types of land use and land cover the supply of such services takes place, especially in heterogeneous mountainous areas. Therefore, this research attempts to (1) distinguish between the potential and actual use (flow) of natural hazard regulating ecosystem services and (2) understand how soil erosion and landslide regulating ecosystem services can contribute to a sustainable management of different ecosystems, especially in rice fields and forest areas. Two models (InVEST for soil erosion, Analytic Hierarchy Process for landslide analysis) were used to analyze and map the contributions of natural versus anthropogenic components for regulating natural hazards in Sapa. The results show the incoherent distribution of erosion regulating services and low capacities of landslide regulating services in areas that have seriously been affected by human activities, especially forestry and agricultural development. The contribution of rice ecosystems to soil erosion mitigation is higher than in the case of landslides. Nevertheless, one-third of the area of paddy fields in the case study area have “no” capacity to supply natural hazard regulating ecosystem services and should therefore be re-forested.

EFFECT OF FURADAN ON HAEMATOLOGY OF Channa punctatus (BLOCH) IN CULTURE MEDIUM UNDER LABORATORY CONDITIONS

Haematological studies of Channa punctatus of local reservoirs in Siwan district within the present study includes the erythrocyte count, hemoglobin concentration and haematocrit value or packed cell volume of blood and subsequently absolute values of MCV, MCH and MCHC were also calculated by the respective formulae. The key effects of butachlor on blood parameters are concerned with total RBC count, their size and differential count of WBC. The importance of this study is worried with pesticide pollution of paddy field area and therefore the effect of butachlor on the hematological profile of the exotic carp, Channa punctatus.

The determinants of collective action in irrigation management systems: Evidence from rural communities in Japan

We examine the characteristics of water user associations (WUAs) that affect the success of collective action for irrigation management. Using random-effects ordered probit models and a large panel dataset from 104,523 rural communities, the results of the econometric analysis verify the hypotheses in the existing empirical literature and confirm the robustness of the theory of collective action in the context of irrigation management. Our results show that collective action for irrigation management depends on the distance from the market, area of paddy field, share of non-farmers and elderly farmers, share of paddy field, and social capital. We also find that collective action has an inverted U-shaped relationship with the number of farm households and diversity in farmers’ landholdings, and a U-shaped relationship with the diversity of a community’s farmers. The results suggest that as the characteristics of irrigation systems and user groups can change little in the short run, policies aimed at suppressing deteriorating collective action for irrigation management need to enhance social ties in a community, thereby promoting community-level social capital.