Increase In Humus Content Research Articles

ФАКТОРЫ, УСИЛИВАЮЩИЕ ОТРИЦАТЕЛЬНОЕ ВОЗДЕЙСТВИЕ ДЛИТЕЛЬНОГО ОРОШЕНИЯ НА СВОЙСТВА ЧЕРНОЗЕМА ОБЫКНОВЕННОГО

Purpose: to identify factors enhancing the negative impact of long-term irrigation on soil fertility. Materials and methods. The influence of mineralization and quality of irrigation water on ordinary chernozems (Neklinovsky district), the level of groundwater table on the reclamation state and soil fertility of ordinary chernozems (Bagaevsky district of Rostov region), the structure of crop rotations was studied, and optimal moisture levels for different irrigation modes were established. Results. Long-term use of sulphate-sodium low-mineralized water led to the degradation of ordinary chernozems. They acquired the properties of medium alkaline and medium solonized soils: alkalinity – 1.29 mmol(eq)/100 g, solonetzicity – 7 % of exchangeable sodium from the total soil absorbing complex (SAC), soil bulk density – 1.34 t/m³, humus content decreased by 23 % during its transformation from fulvate-humate to humate-fulvate. The close ground waters table and their mineralization of 5 g/dm³ contributed to secondary salinization. Fertility reproduction is observed only with the introduction of organic fertilizers. The increase in humus content in the alfalfa-corn crop rotation was 0.68 % with the introduction of 60 t/ha of manure after 4 years of corn cultivation in comparison with the humus content after 3 years of alfalfa cultivation, and in the grain feed – 0.55 %. It was found that with an increase of irrigation rate up to 30 %, leaching of exchangeable calcium is observed with a simultaneous increase in the content of exchangeable sodium up to 4 % of the total SAC, which contributes to an increase in bulk density of ordinary chernozem to 1.38 t/m³. In the variant with over-irrigation, the humus content decreased by 0.22 % over 4 years of regular irrigation, and in the variant with the optimal and reduced by 40 and 60 % rates, its amount decreased from 0.04 to 0.07 %, as in dry land. Conclusions. The investigated factors enhance under certain conditions the negative impact of long-term irrigation on the properties of ordinary chernozem.

Effect of humus and soil substrates on production parameters and quality of organic strawberries

ABSTRACT This study aims to verify the most suitable substrate formulation based on proportions of earthworm humus and soil to improve the quality of organic strawberries. Vermicomposting generated humus and strawberry seedlings were planted in different humus:soil ratios: (0:100; 20:80; 40:60; 60:40; 80:20 and 100:0, respectively). The proportional conditions were characterized after planting and after 60-day cultivation, plants were harvested, and chemical characterizations of the soil and plants were made. We verified that with an increase of humus content in the substrate, an increase in values of N, P, K, pH and organic matter in soil and dry and fresh mass in shoot area of the plants were noticed. In relation to fruits, pH, humidity and sodium concentration, the authors noticed no change under any conditions and ash content was lower when an increase of humus in soil was observed. Higher values of potassium and protein occurred from 40:60 and 60:40, respectively. Higher values for average strawberry production were verified from 60:40 condition. Reducing sugars and titratable acidity increased and stabilized at 20:80 and 60:40, respectively. Thus, in order to avoid excess of nutrients in the substrate, which can hinder plant growth, humus condition in the ratio 60:40 humus:soil is recommended for higher values of production, nutrients and protein in strawberry cultivation.

EFFECT OF MICROBIAL PREPARATIONS ON THE HUMUS BALANCE IN SOD-PODZOLIC SOIL

Objective. To study the efficiency of inoculation of seeds by biological preparations under in-fluence on humus balance in growing crops in short crop rotation. Methods. Field, laboratory, cal-culation-comparative. Results. It was found that the highest entrance of organic matter in the soil was due to the use of organo-mineral fertilizing system NPK-manure-green manure, which contrib-utes to the increase of organic carbon reserves by 17.4 t/ha without the use of microbial prepara-tions and by 18.0 t/ha against the background of microbial preparations in comparison with the mineral fertilizing system. The use of microbial preparations under the fertilizing systems NP-manure-green manure allows to increase the amount of organic matter entering the soil by 1.2 and 1.6 t/ha during crop rotation. Under the use of organic fertilizers (manure, green manure) in com-bination with mineral ones and seed inoculation, not only the recovery of fertility of sod-podzolic soil, but also increase in the content of humus within the limits of 0.43–0.53 t/ha is reported. The use of manure on the background of the NPK makes it possible to increase the humus reserves in the soil by 0.11 and 0.15 t/ha per year. During crop rotation, the amount of newly formed humus in this variant exceeded its mineralization loss by 0.42 t/ha without microbial preparations and by 0.58 t/ha on the background of microbial preparations. Conclusion. The positive effect of the use of biological preparations under inoculation of seeds in combination with the organo-mineral fertiliz-ing system on the content of humus in sod-podzolic soil on average by crop rotation was estab-lished. Organic-mineral fertilizing system (NPK + manure + green manure) provides the highest growth of humus reserve in soil — 0.53 t/ha per year. The use of microbial preparations in the cul-tivation of crops under this fertilizing system contributes to the increase of humus content in the soil by 0.16 t/ha during crop rotation.

Ефективність агроекологічних заходів у сівозмінах на зрошуваних землях півдня України

Ефективність агроекологічних заходів у сівозмінах на зрошуваних землях півдня України

Погребенные почвы средней части Маклашеевского II городища (Среднее Поволжье)

Maklasheevsky II settlement is a complex archaeological site, which includes settlements of the early Iron Age and the early Middle Ages, separated by more than six hundred years of natural development and transformation of anthropogenic structures. Maklasheevsky II ancient settlement is a remnant of a terrace 10 m high above the reservoir level and the defensive structures (3.0 m high) of the Early Iron Age and the early Middle Ages preserved on it. By origin, this object is a natural and anthropogenic geosystem. During the period of natural development of the middle part of the Maklasheevsky II settlement, soil formation prevailed on relatively flat surfaces and the formation of underdeveloped soils – sod-carbonate, subsequently buried by deluvium. In buried soils, an improvement in structure and water resistance is noticeable, up to a good estimate, in comparison with overlapping deluvium. In addition, there was an increase in the carbon content of humus by almost 1.5 times, the actual acidity decreased to neutral, the hydrolytic acidity increased, compared with overlapping deluvium.

Влияние минеральных удобрений на плодородие дерново-подзолистых почв в кормовых севооборотах

In the period 2001...2012 in the experimental field of Mari Agricultural Research Institute the productivity of three fodder crop rotations, galega-bromopsis herbage was evaluated and their effect on soil fertility was determined. The main difference between rotations was in a different saturation with perennial legumes and grasses (I rotation -16,6%, II - 33,0, III - 50,0%) at the application of recommended for the central zone of the Republic of Mari El (N 6 oP 6 oK6 0 ) and increased (N 90 P90K 90 ) doses of mineral fertilizers. The results showed that the fertilizer application in crop rotation for 12 years contributed to the increase in the percentage of humus content in soil by 0.4-0.6 %. Оп noncrop rotation area it is observed the largest increase in content of humus in soil; this area was constantly cultivated with herbage of galega-bromopsis grass mixture in the background of recommended and high doses of PK fertilizers. The same increase was in rotations I and III on the background of high doses of NPK. The relationship between the saturation of crop rotations with perennial grasses and a mass fraction of humus in soil were not detected. The acidity of the topsoil in two of the rotation fof odder crop rotation tended to increase by 0.1...0.3 units of pH, significant differences between variants were not detected. The content of phosphorus mobile forms in soil increased by 40-170 mg/kg (5.9 20.2 %) in two rotations and sowing of galega with bromopsis over the study years. A slight downward trend is marked in the potassium content in the soil up to 15 mg/kg (8 %). Increasing the proportion of legumes-cereal grasses to monoculture in the structure of the rotation from 16.6 to 50 % of feed units per unit area on average within 12 years increased to 3.6 %. Input of higher doses of mineral fertilizers over the recommended one leads to increase in productivity by 200.445 fodder units per ha (4.7.11.2%); less addition was obtained at existence of two or three fields of perennial grasses in crop rotation. Use of highest doses of PK-fertilizers in perennial sowing of galega-bromopsis grass mixture allowed highest addition of productivity - 613 fodder units per ha (14.1%).

The effect of zeolite, organic and inorganic fertilizers on soil chemical properties, growth and biomass yield of apple trees

The objective of this study was to evaluate the influence of organic (cattle manure) and inorganic fertilizers [composite NPK (15:15:15)] and natural zeolites on soil properties, vegetative growth and yield of apple plants grown on vertisol under Cacak conditions (Western Serbia). The results showed that the combined fertilization induced a decrease in acidity, an increase in humus content, a partial increase in total nitrogen (NTOT), and, primarily, a rise in available phosphorus (P) and potassium (K) levels. A highly significant (<i>P</i> < 0.01) interactive effect of the apple cultivars and nutrients on one-year-old shoot length and trunk cross-sectional area (TCSA) and a significant effect (<i>P < 0.05) on yield per tree and yield per hectare were determined.

Paleosols from the groups of burial mounds provide paleoclimatic records of centennial to intercentennial time scale: A case study from the Early Alan cemeteries in the Northern Caucasus (Russia)

Buried soil chronosequences under a series of Early Alan kurgans (burial mounds) in the Vladikavkazkaya depression of the Northern Caucasus, Russia, were studied to derive a high-resolution paleoclimatic record from the variations of the selected paleosol properties. Haplic Chernozems occur under kurgans and on the actual land surface. Three kurgan cemeteries, Brut 1, Brut 2 and Beslan, dated from the end of the second to the beginning of the seventh centuries AD have been studied. The cemeteries are situated close to each other under similar lithological and geomorphological conditions but differed in the paleosols' preservation. The Brut 2 site has been recently altered due to annual ploughing and intensive irrigation for more than 30 years. The background soils and paleosols of the Brut 2 site have been compared with synchronous soils of non-irrigated Brut 1 and Beslan sites to detect pedogenic properties that are less changed by irrigation and thus comprise the “soil memory”. Stronger black color of humus horizon, increase of humus content and decrease of humus δ 13C values; clear signs of biological activity, absence of morphological and analytical signs of solonetz properties; diffused carbonate white soft spots in the Bca horizon and decreasing carbonate content are thought to be related to the comparatively humid climatic conditions in the region. On the contrary, relatively low humus content, tongue-like lower boundary of humus horizon, increase of humus δ 13C values, morphological signs of solonetz properties together with high content of exchangeable Na, relatively large and clearly shaped carbonate white soft spots in the paleosols of the Brut 2 site, as well as increase of density, thickness of the carbonate pseudomicellium and high carbonate content in the upper part of profiles in the paleosols of the non-irrigated Brut 1 site are assumed to be xeromorphic features, indicating comparatively drier climatic conditions. The paleosols of the earliest chronointerval of burial (the end of the second to the beginning of the third centuries AD) demonstrate clear xeromorphic properties which indicate a relatively dry climate with a mean annual precipitation 50–100 mm less than today. The estimated duration of the period with such climatic conditions is thought to be not less than 100 years. In addition, those paleosols have some weak signs of humid conditions indicating that between the end of the first and the middle of the second centuries AD the climate was getting more moist, mean annual precipitation became equal or slightly higher than today. The paleosols buried in the first half of the fifth century AD again demonstrate the gradual enhancement of xeromorphic properties reflecting the next stage of droughts. Thus, the period with favourable humid climate when the Early Alan culture flourished in the Northern Caucasus was relatively short (about 400 years). Studying the detailed chronosequence in the non-irrigated Brut 1 site the records of intercentennial time scale soil properties variability produced by comparatively “fast” pedogenic processes typical for the steppe zone i.e., humus formation and accumulation, bioturbation, carbonate accumulation and transformation and solonetzization, have been provided.

Results of 75 years of continuous fertilization experiments in skierniewice as a contribution to modification of fertilization

Long‐term static experiments have been carried out since 1923 at the Experimental Field in Skierniewice, belongs to Warsaw Agricultural University. The soil of the Experimental Field belongs to the type of lessive of the very good ryeland complex. The content of silt and clay (particles < 0,02 mm) in particular genetic horizons is as follow: 15–17 % in Ap (0–25 cm), 10–12 % in Eet (25–45 cm) and 25 % in Bt and C (below 45 cm). Organic C content in the arable layer varies within 0,6–0,9 %. The precipitation is relatively low (520 mm) and its distribution ist rather unfavourable for cereals. Mean annual temperature amounts to 7,9 °C and average growth period is 215 days (air temperature above 5 °C). Farmyard manure lead, as compared to mineral fertilization to an increase of humus content, and available K. Humification coeffizient of C‐FYM is 6–8 %. To maintain for many years the pH values of soil at the level of 5,5–6,5, application of 1,6 t CaO/ha every 4 years is satisfactory. Much higher yield of plants was obtained on the fields with crop rotation with FYM and legumes than on the fields without either FYM or legumes. Rye grown seventy years in monoculture gives only slightly lower (by 10–15 %) yields than that cultivated in arbitrary crop rotation. At the similar N, P, K rates brought into soil with farmyard manure and mineral fertilizers, higher yields of rye and potato in monoculture are obtained with mineral fertilizers. Content of total org. C and N during last 33 years is equal in treatments without either mineral or organic fertilizers, a little increased with the mineral fertilization and at highest in the FYM+mineral fertilizers treatments. Losses of nitrogen from top soil layer are higher from FYM than from mineral fertilizers.

STUDIES ON THE BIOLOGY AND CHEMISTRY OF THE GULF OF MAINE

A bacteriological survey has been made of the waters and bottom sediments in the Gulf of Maine and Georges Bank. The samples of water, plankton tow, and sedimentary material were taken under sterile conditions and subjected immediately to bacteriological analysis as soon as brought on board the "Atlantis."The agar-plate method was used for the enumeration of the numbers of bacteria. This was supplemented to a limited extent by the dilution method. Various specific media were used to determine the distribution and relative abundance of certain groups of bacteria which are believed to take part in important marine processes.The results obtained demonstrated the fact that the bacterial population of the sea can be divided into three groups on the basis of their habitat: (1) those forms which live in the sea bottom, especially in the surface layers; (2) those bacteria which live in the free water, this being possible only when the water contains in solution organic and inorganic substances which can serve as ...