Agroecological land typification

The minimum required information and the sequence of agroecological land type allocation on the land management territory of the experimental station (ES) located in the forest-steppe of the Priob'ye region of Novosibirsk is described. Two agroecological land types are distinguished: the first type (upland lands) is represented by leached chernozem in combination with common, podzolized and dark-grey forest soils; the second type (slightly erosive lands) is represented by leached chernozem in combination with dark-grey forest soils. Soil cover of ES in both types of lands is represented by leached chernozem (Lch-2-2s), the share of which for the first type is 75.26%, for the second - 76.26% of the total area of the types. The first agroecological land type is characterized by a range of heights from 134 to 165 m. The working areas are located on the slopes between 0 and 3 degrees in relation to the terrain angle. Vertical dissection of the relief averages 1.3 m, horizontal dissection by erosion forms is 0.8 km/km2. The second type of land is characterized by an elevation of 113 to 137 meters above sea level and a slope of 1 to 4 degrees. Vertical dissection of the terrain averages 1.7 m, horizontal dissection by erosion forms 0.9 km/km2. Typification was carried out with the help of a generated Digital Land Use Model (DLM) of the ES based on the analysis of geographical information, remote sensing materials (ERS) and cadastral map. The DLM consists of the following geo-information layers: topography, land cover, digital elevation model (DEM), working areas. The DEM includes information on slope steepness and exposure, vertical and horizontal dissection.

Dependence of spring wheat seed productivity on mineral fertilizer doses and seeding rates

The article presents the results of field studies conducted in 2018-2020 on the leached chernozem of the Volga foreststeppe. The objects of the research are the varieties of spring wheat Tulaykovskaya 10 (control), Yoldyz and Tulaykovskaya 108. At seeding rates of 5.0 and 5.5 million viable seeds per 1 ha the effect of mineral fertilizers was studied. The fertilizers were represented by a complete NPK mineral fertilizer of 16 kg a.i. and by top-dressing with mineral nitrogen fertilizer in the tillering phase at the doses of 30, 60 and 90 kg a.i./ha against this background. An increase in the seeding rate of seeds from 5.0 to 5.5 million seeds per 1 ha led to a significant increase in the yield of spring wheat in all years of study (by 0.11-0.26 t/ha), the weight of 1000 seeds – by 1.44 g (LSD05 = 1.14), the nature of grain - by 8 g/l (LSD05 = 5). The effect of top-dressing with nitrogen fertilizers has been proved – the increase in yield ranged from 0.15 to 0.28 t/ha over three years on the average, the maximum from a dose of 60 kg a.i. A statistically significant increase in the weight of 1000 seeds was provided by nitrogen fertilization in doses of 60 and 90 kg a.i./ha – by 2.79 and 1.87 g, respectively (LSD05 = 1.47), grain nature increased at doses of 30, 60 and 90 kg a.i./ha by 34, 23 and 16 g/l, respectively (LSD05 = 2). The average yield of spring wheat varieties with the selected combination of factors (5.5 million seeds/ha, N60) was in the range of 2.64-2.70 t/ha with a mass of 1000 grains 44.03-44.56 g, the nature of grain 765-783 g/l. The studied varieties differed in responsiveness to nitrogen fertilization (N60 against the NPK background): Tulaykovskaya 10 (+0.43 t/ha), Tulaykovskaya 108 (+0.39 t/ha), Yoldyz (+0.24 t/ha). Increases in yield from an increase in the seeding rate were 0.20 (Yoldyz), 0.25 (Tulaykovskaya 108) and 0.26 t/ha (Tulaykovskaya 10). In general, according to the experiment relative to the control variety Tulaykovskaya 10, the variety Yoldyz stood out with a stable increase in yield over the years of research (+0.08 t/ha), statistically significant in years with insufficient moisture. The Yoldyz variety was distinguished by an increased profitability of cultivation – up to 59.4 % at a seeding rate of 5.5 million viable seeds/ha against the background of applying mineral fertilizers N16P16K16 for pre-sowing soil cultivation.

Dependence of agrochemical and agrophysical properties of leached chernozem on soil treatment system

The results of research on the dependence of agrochemical and agrophysical properties of leached chernozem on the system of soil treatment are presented. The work was performed in 2015–2019 in a long-term stationary field experiment in crops of spring soft wheat Siberian Alliance. The soil of the experimental site is medium-powered medium-humus heavy-loamy leached chernozem. Wheat was preceded by clean fallow, green fallow (rape), green fallow (cloverleaf). The following tillage systems were studied: deep moldboard (control), deep combined, minimum combined, minimum moldboard. There is an advantage in nitrate nitrogen content in the soil before sowing, in the phase of tillering and earing of wheat on the preceding cereal fallow (rape) when using the minimum tillage system (in autumn the break crop BDT-3 is planted). The effect of the tillage system on the nitrate nitrogen content in the soil in the phase of bushing of wheat - 15,5%, conditions of the year - 12,9, the interaction of these factors - 20,1% was determined. A positive relationship between the content of nitrate nitrogen in the soil and the amount of mobile phosphorus on the precursor green fallow (rape), r = 0.7118-0.8917 (R = 0.9500), was detected. High P2O5 content (from 150 mg/kg and above) was recorded on average for 5 years during the earing phase of wheat - 145.0 to 165.6 mg/kg. Maximum P2O5 values were detected for green fallow (rape) under minimum combined and minimum moldboard systems. A significant increase in exchangeable potassium content over the control average for 2015-2019 was observed with the deep combined tillage system - 5.0 mg/kg (NSR05). With the other tillage systems studied, the figures were at the control level. Higher soil pedality coefficients were revealed with a deep moldboard processing system (control) - 2.54, a minimum combined - 2.47, a minimum moldboard - 2.23 according to the predecessor green fallow (rapeseed); for green fallow (melilot) - 2.98 (deep moldboard). With an increase in the pedality coefficient, there was a decrease in the soil bulk density index, r = -0.3499 (R = 0.5760). A tendency was revealed towards a decrease in the soil bulk density to 0.98 g/cm3 according to the predecessor green fallow (rapeseed) with minimization of soil cultivation: combined moldboard and minimum moldboard; with a deep moldboard (control) - 1.02 g / cm3. As a result of the correlation analysis, it was found that with an increase in the soil bulk density, the content of P2O5, r = –0.4898, K2O, r = –0.2530, decreases.

EFFICIENCY OF APPLICATION OF AGRONOMIC ORES IN CULTIVATION OF PEAS ON LEACHED CHERNOZEM IN THE CONDITIONS OF THE REPUBLIC OF TATARSTAN

The effect of phosphorite at a dose of 4 t / ha and glauconite at a dose of 15 t / ha of the Syundyukovskoye deposit and zeolite at a dose of 10 t / ha of the Tatarsko-Shatrashansky deposit on the yield and quality indicators of the seed of peas variety Vatan was studied. In field experiments, the effectiveness of the studied agronomic ores when applied to the soil was revealed. An increase in yield by 8.1-8.9 c/ha and an improvement in grain quality in terms of protein content up to 24.1 %, nitrogen up to 3.66 % and phosphorus up to 0.52 % were established.

THE EFFECT OF ZEOLITE ON THE YIELD AND BIOCHEMICAL PARAMETERS OF SUGAR BEET

The article presents the results of a field experiment on the introduction of zeolites from the Tatarsko-Shatrashansky deposit of the Republic of Tatarstan for sugar beets, the Dubravka variety, on leached chernozem. The studied doses of the agromineral are 10 and 15 t/ha. The results of the study revealed the effectiveness of zeolite when embedded in soil and its effect on the productivity of sugar beet and its biochemical characteristics. An increase in crop yield was established by 1.3-1.5 t/ha. An increase in the content of nitrogen and easily hydrolyzable carbohydrates in root crops is noted - depending on the dose of zeolite, up to 0.19 and 0.7 %, respectively.

Ecological assessment of the impact of agricultural activity on the emission of carbon dioxide from the leached chernozem of the Tobol-Ishim interfluve

The purpose of this work is to study carbon dioxide emissions from the surface of virgin and arable chernozem during the growing season of the Tobol-Ishim interfluve. Methods. The study was conducted on virgin land, in pure steam, under grain crops and corn from May to October. The intensity of carbon dioxide release was determined by the method of Shtatnov with titration in the field. Results. Based on previous studies, based on scientifically based approaches, as well as our own experimental data, the relationship between carbon dioxide emission and hydrothermal conditions of the humus layer (0–30 cm) was investigated, and the degree of influence of the type of land and crops on the release of CO2 from the surface of leached chernozem was determined. It has been established that the chernozems of Western Siberia are characterized by very low biological activity in the spring and autumn periods. CO2 emissions in May averaged 1.0–1.6 kg/ha per hour with a coefficient of variation of 8 %. The peak release of carbon dioxide into the atmosphere occurs in June-July (2.6–6.5 kg/ha per hour). It was revealed that under grain crops the gaseous losses of C–CO2 in the summer period amount to 4.1–6.5 kg/ha per hour, and in the area of pure steam – 2.3–3.4 kg/ha. The determining role in the intensity of carbon dioxide release is played by the soil temperature (r = 0.7). During the years of research, there were no dry periods, which did not allow us to establish a reliable effect of soil moisture on CO2 emissions, the correlation coefficient was 0.2 units. Based on the results obtained, a low degree (12.8 %) of the influence of the type of land (virgin land/arable land) and crops (cereals/corn) on the intensity of carbon dioxide release into the atmosphere from the surface of chernozem was revealed. The maximum degree of influence was in hydrothermal soil conditions (65 %), on which the activity of the soil microbiota and the root system of plants depended. Scientific novelty. For the first time, the intensity of carbon dioxide release from the surface of leached chernozem was studied for the Tobol-Ishim interfluve and the degree of influence of the anthropogenic factor against the background of the hydrothermal regime of soil was established.

Humus condition and nutrients regime of leached chernozem depending on sugar beet fertilization

The aim of the study is to investigate the state of humus and nutrient regime of leached chernozem under traditional and alternative systems of sugar beet fertilization. Field, laboratory and analytical methods were used during the research. The application of straw stabilized the humus content in the upper 0-30 cm layer of leached chernozem, increasing its content compared to the control without straw by 0.08-0.12%. The highest absolute content of humus in the layer of 0-30 cm was achieved by applying 5 t/ha of straw + N50 + N100P100K100 - 3.00% with an advantage to control without fertilizers by 0.13%. The combined application of mineral fertilizers and straw provided the conditions for favorable mineral nutrition of sugar beets at the beginning of the growing season and the stability of their growth and development during the growing season. The content of nitrate nitrogen in the layer of 0-30 cm of soil under the application of 5 t/ha of straw + N50 + N100P100K100 was 23.2 mg/kg, ammonium - 14.4, mobile phosphorus - 96, mobile potassium - 109 with the advantage to control without fertilizers by 5.2, 3.5, 7.0 and 12 mg/kg of soil, respectively. The study of the influence of alternative organic-mineral fertilizer systems on soil fertility parameters is the basis for the development of sustainable sugar beet fertilizer systems in the context of climate change.

Effect of sprinkler irrigation on the properties of leached chernozem and the yield of Bromopsis inermis Leyss. in the Southern Cis-Ural

The paper examines the effect of the long-term (10 years) low-intensity sprinkler irrigation on the properties of leached chernozem soils covered with Bromopsis inermis Leyss. (BIL) stands in the Southern Cis-Ural forest-steppe. The study analysed changes in the soil’s agrophysical and chemical properties. As a result of long-term irrigation, the humus horizon (A + AB) thickness increased by 16 ± 3 cm; the organic carbon (Corg) content and nutrients decreased in this rooting zone, in particular, Corg by 0.3%, available phosphorus by 24.8 mg/kg, exchangeable potassium by 18.4 mg/kg and the stock of Corg by 16 t/ha. The particle size distribution of irrigated soil did not significantly changed; some changes were observed for the soil’s aggregate composition. The soil’s hydrophysical properties, water and air regime worsened.