Effect of agrochemicals on spatio-temporal changes in soil agrochemical properties and yield of broccoli

The aim of the study. The aim of the study was to examine the effect of agrochemicals (mineral and organo-mineral fertilizers, plant growth regulators and ameliorants) on the spatio-temporal changes in the properties of agro-gray soil and broccoli yield using a cartographic approach. Methodology. The field experiment was conducted in 2016 at the site located near the Bykovo village in the south-east of West Siberia (54°58 '02.8" N; 83°5'21.45" E, Novosibirsk region). The objects of the study were the agro-gray soil (Luvic Retic Greyzemic Phaeozem (Siltic, Aric)) and the medium-ripe broccoli cabbage variety "Linda". The experiment scheme included the following treatments: (1) Control (without fertilizers), (2) Background (N100P60K160), (3) Background + succinic acid, (4) Background + dolomite, (5) Background + mulch, (6) Organo- mineral fertilizer "Criall". Soil samples were analyzed for the content of organic carbon, nitrates, total, mineral and organic phosphorus, as well as its mobile form; exchangeable potassium, calcium and magnesium, and pH. The dried samples of broccoli inflorescences were analyzed forthe total content of nitrogen, phosphorus, potassium, calcium and magnesium.Main results. After applying agrochemicals and harvesting broccoli, the variation coefficients of рН, mobile phosphorus, potassium and calcium increased by two or more times. The use of agrochemicals increased the yield and improved the nutritional value of broccoli inflorescences. The treatments with mineral fertilization(2, 3, 4 and 5) the treatment 2 (Background N100P60K160) provided the greatest return. The application of the studied agrochemicals resulted in the negative (acidification, binding of phosphorus, calcium and magnesium) and positive (increase in the content of elements) effects. The immobilization of nutrients (phosphorus, calcium, magnesium) in poorly soluble soil compounds and the respective decrease in the content of the elements’ mobile forms did not have a negative effect on the elemental composition of broccoli inflorescences. Thus, chemical immobilization, leading to the fixation of nutrients in the upper soil horizon, prevents their leaching by melt- and rainwater into the lower horizons.

Analysis of Tomographic Images of the Soil Pore Space Structure by Integral Geometry Methods

The technique of numerical analysis of three-dimensional tomographic images of the pore space of soil objects has been used in this paper. It applies methods of integral geometry, topology and morphological analysis. To characterize quantitatively the transformation of the pore space structure, tomographic images of four undisturbed soils were analyzed, i.e., heavy loamy agro-gray soil (Retic Phaeozem), agromineral (Sapric Rheic Mineralic Histosols), and hypnum (brown moss Sapric Rheic Histosols) peat soils in dry and wet conditions. For samples of the subplow horizon in agro-gray soil, a decrease in both Betty numbers was observed on wetting, where the zero number (b0) stands for the amount of topologically simple closed pores, and the first number (b1) indicates a decrease in pore connectivity, which varies in a narrower range of pore sizes as compared to b0. When a sample of agromineral peat soil is moistened, the Euler–Poincaré characteristic is negative ​in the pore range of 0.1–0.16 mm, which points to the predominating complicated branched structure of the pore space and high pore connectivity. When hypnum moss is saturated, a lot of tunnel pores get narrower (“collapse”), and the connectivity decreases due to the structural specifics of long-stemmed plant residues. The number of pores and connections between them in peat soils is an order of magnitude higher than those in the subplow horizon A of the agro-gray soil. The provided quantitative changes in the considered parameters of tomographic images of the soil pore space confirm the possibility of applying them for estimating the transformation of the pore space in soils.

BIODIVERSITY OF EDAPHIC FAUNA IN GRAY FOREST SOILS OF THE REPUBLIC OF MOLDOVA

Gray forest soils of the natural ecosystems in the central and northern zones of the Republic of Moldova are the habitat and the source of conservation and reproduction of the edaphic fauna. They represent themselves the standards of the biodiversity for soil invertebrates. Invertebrates sampling was carried out from test cuts by manual sampling of soil layers to the depth of soil fauna occurrence. The main content of invertebrates in gray soils under the forest was in the layer of 0-20 cm. In addition to the Lumbricidae family there were found the species of the Clubionidae, Hydromiidae, Scarabaeidae, Oniscidae, Tortricidae, Julidae, Curculionidae, Carabidae, Geophilidae, Tenebrionidae, Melandryidae and Formicidae families. Species of Eisenia rosea, Euomphalia strigella, Formica rufa, Tortrix viridana, Curculio glandium, Melolontha melolontha and others have been identified in three subtypes of gray forest soils of natural ecosystems. The long use of these soils in agricultural production led to the considerable decrease in the number and biomass of invertebrates and degradation of the faunal complex in general. The number of families decreased from 6-12 to 1-3. Species of Lumbricidae, Elateridae, Tortricidae and Coccinellidae have been found in arable gray forest soils. The trophic pyramids are stable in the typical virgin gray soil. The relationship between trophic levels of the edaphic fauna in the typical gray forest soil is stronger in comparison with albic and molic gray forest soils.

Influence of systems of basic tillage and fertilization with the use of by-products on weediness of crops in crop rotation

The results of research on the study of the influence of soil processing systems and fertilizer using co-product for sown clogs and the yield of agricultural plants in a short-growing crop rotation are given. The influence of soil processing systems and fertilizer using co-products for sown clogs and the yield of agricultural plants in a short-live crop rotation is investigated. It has been established that on dark gray soil use in crop rotation of unifituted soil treatment systems contributes to an increase in the level of sown clogging (barley of the corn on grain at 1.4–1.6, wheat winter of winter of winter in 1.4–1.8 times) Due to the accumulation of the main amount of weed seeds in the upper soil layer. The system of fertilizer with by-products at the beginning of the vegetation of plants stimulates the germination of weeds. On average, over the years of research, the abundance of weeds in cropping crops at the beginning of vegetation when using unifituted soil treatment systems was 213–362 pcs/m2, dismissal – 94–108 pcs/m2, and before harvesting was noted a decrease in clogging, respectively, 29–57 pcs/m2, 10–13 pcs/m2. The air-dry weight of the weeds of the highest was with surface soil processing using co-product fertilizer (81.3–85.4 g/m2) relatively with dumping soil treatment (21.7–23.3 g/m2). The highest grain grain of wheat winter – 6.91 and 6.50, corn – 11.47 and 11.74, barley of the yarn – 5.37 and 5.13 and the rape of winter – 3.08 and 3.19 t/ha received when Discalled by 20–22 cm and shallow 10–12 cm soil processing system. With a 6–8 cm surface, the yields of crops decreased by 1.45, 3.66, 1.69 and 0.31 t/ha correspond to plants. A significant reason for reducing plant yields in versions with unifituted soil treatment systems served as a clogging factor, because the level here was higher than when the soil processing.

INFLUENCE OF HARVEST TIME OF WINTER WHEAT VARIETIES TO THE GRAIN YIELDS IN THE CONDITIONS OF THE SOUTHERN REGION

This article describes the differences of winter wheat "Selyanka", "Jayhun", "Krasnadarskaya-99" and "Turkiston" in the conditions of ancient irrigated, grazing light gray and barren soils of Kashkadarya region. the Turkestan variety was observed on May 14, May 22, June 8, respectively, while the phase was observed on May 21 and the full ripening phase on June 7; Krasnadarskaya-99 variety matured on May 16, May 24, June 10 and Jayhun variety on May 18, May 26, June 12, or the Turkestan variety growing season was 1 day, Krasnadarskaya-99 variety ripened for 3 days and Jayhun variety ripened 5 days later than Selekta. Turkestan and Krasnadarskaya-99 varieties of winter wheat and Selyanka and Jayhun varieties of winter wheat in the conditions of high irrigated soils, when the harvest period reaches the stage of full ripening on June 5-7 in the conditions of light gray soils grazing in order to obtain high and quality harvests of winter wheat. June 7-12 to reap the full maturity stage, when the impact of information. KEYWORDS – previously irrigated, grazing light gray soil, barren soil, winter wheat varieties “Selyanka”, “Jayhun”, “Krasnadarskaya-99” and “Turkiston”, harvest dates, grain harvest of winter wheat.

INFLUENCE OF HARVEST TIME OF WINTER WHEAT VARIETIES TO THE GRAIN YIELDS IN THE CONDITIONS OF THE SOUTHERN REGION

This article describes the differences of winter wheat "Selyanka", "Jayhun", "Krasnadarskaya-99" and "Turkiston" in the conditions of ancient irrigated, grazing light gray and barren soils of Kashkadarya region. the Turkestan variety was observed on May 14, May 22, June 8, respectively, while the phase was observed on May 21 and the full ripening phase on June 7; Krasnadarskaya-99 variety matured on May 16, May 24, June 10 and Jayhun variety on May 18, May 26, June 12, or the Turkestan variety growing season was 1 day, Krasnadarskaya-99 variety ripened for 3 days and Jayhun variety ripened 5 days later than Selekta. Turkestan and Krasnadarskaya-99 varieties of winter wheat and Selyanka and Jayhun varieties of winter wheat in the conditions of high irrigated soils, when the harvest period reaches the stage of full ripening on June 5-7 in the conditions of light gray soils grazing in order to obtain high and quality harvests of winter wheat. June 7-12 to reap the full maturity stage, when the impact of information. KEYWORDS – previously irrigated, grazing light gray soil, barren soil, winter wheat varieties “Selyanka”, “Jayhun”, “Krasnadarskaya-99” and “Turkiston”, harvest dates, grain harvest of winter wheat.

The Influence of Mineral Nutrition on the Productivity of Spring Rape

This article presents data on the influence of mineral nutrition on the productivity of spring bird rape varieties in the conditions of the non-chernozem zone of Russia. The experiments were carried out on agro-gray loamy soils of the experimental agrotechnological station of the Federal State Budgetary Educational Institution of Higher Education “Ryazan State Agrotechnological University” (FSBEI HE RSATU) in the Ryazan Region in 2016-2018. A level of mineral nutrition for spring bird rape was calculated asN180P100K100. Based on this, the options for mineral nutrition in research were established. According to the results of the experiments, the duration of the growing season of spring bird rape varieties was established: 73-91 days.An increase in nitrogen to 150 kg of the active substance turned out to be less effective, as the yield increased slightly or remained at the level of N90P50K50. The use of phosphoruspotassium fertilizers did not contribute to the creation of such a nutritional regime that would increase seed productivity. An increase in the nitrogen nutrition of the plants led to increased protein content anddecreased oil content in seeds. This trend was observed in all varieties of spring bird rape. The average oil content was 38.5-45.5% and the average protein contentwas 18.0-24.7%, depending on the variety and the level of mineral nutrition. On average, the highest oil content was shown by varieties Lipchanka (44.1%) and Kulta (42.6%). Keywords: agro-gray soil, level of mineral nutrition, oil content, productivity, spring bird rape, variety

Assessment of the State of Soil’s Microbial Community in Condition of Intensive Influence of Pollutants

This paper presents the study of toxicological state of the soil. It shows ecological and microbiological properties of the soil mantle in the areas of technological environmental impact and evaluates changes in the number of soil microorganisms as a result of toxic contamination of urban soil at different distances from the Moscow loop highway, and also as a result of dumping aluminum foundry slag in Orel region. Soil-inhabiting invertebrates species composition was evaluated at different soil contamination conditions. It was proven that the state of microbiocenosis changes depending on the intensity and character of the anthropogenic impact. It was established that soil fermentation and microbiological activity changes depending on the value of the cumulative heavy metals’ build-up coefficient. Study of interelement ties between the heavy metals concerned showed that they too may have the same anthropogenic origin regardless of their sources of origin. Pollution index indicates medium to high level of soil contamination in explored urban territories where vehicle emission is the main source of pollution, and dangerously high contamination of light-gray soil in the small settlement impacted by a nearby slag disposal site.