Spring-sown Wheat Research Articles

Information and Theoretical Foundations for Control of the State of Agrocenoses in Real Time

Objective: Presentation of a complete theory of management of the state of agrocenoses, including sowing crops and weeds. This theory makes it possible to obtain a given crop yield with the required reliability. Such management is formed on the basis of estimates of the parameters of the state of crops, soil environment and weeds, formed according to the data of Earth remote sensing in real time. Methods: The presented theory is based on new mathematical models of the parameters of the state of agricultural crops, soil environment, weeds, as well as models of the relationship of these parameters with remote sensing (RS) data. Control factors in agricultural technology are doses of mineral fertilizers, herbicides and irrigation rates. Therefore, the parameters of the state in the management system under consideration, in addition to the parameters of the biomass of agricultural crops and weeds, are the chemical parameters of the soil environment. All technological operations are carried out at the onset of certain phenological phases of the development of crop sowing. RS data are entered precisely at such moments of time when the parameters of the state of crops and weeds are estimated on their basis. The presented theory is based on classical control principles used in modern dynamic systems. The most important feature of the proposed approach to solving the problem of agrocenoses management is the development of the principle of spatial distribution of agricultural technology parameters. It consists in using models with spatial variables, which are complemented by models of spatial approximation of controls in the form of multidimensional power polynomials. The parameters of the approximation models are evaluated according to the optimal parameters of technological operations obtained on 15-20 test sites of the field. Results: In accordance with the proposed theory, mathematical models of agrocenoses, a real-time control algorithm using RS data and a specialized software package were developed, with the help of which the control system was tested on the example of spring wheat sowing. Conclusion: As a result of testing a specialized software package for the implementation of the proposed theory, the operability of the proposed theory of agrocenoses control in real time and the possibility of using it in practical systems for automated control of agricultural technologies were established.

Effects of land use-land cover on soil water and salinity contents

Soil salinization due to inadequate land management is considered one of the main threats to the sustainable development of agroecosystems in arid and semiarid regions. Approximately 20% of irrigated areas in the word are threatened by secondary soil salinization. To explore the influence of land use-land cover (LULC) on soil water and salinity in those regions, farmland areas planted with spring-sown wheat (Triticum aestivum L.) or alfalfa (Medicago sativa L.), and bare land (CK) in the Qinwangchuan irrigated region of Gansu Province in China were selected as the research objects. The characteristics of surface vegetation (coverage, height, biomass), surface micro-environmental factors (light intensity, soil temperature) and soil physicochemical properties (moisture and salinity) were measured successively for four years, and their changes and quantitative relationships were analyzed. The results showed that the coverage, height, and biomass of surface vegetation (or stubble) under different LULCs in spring and autumn were significantly different (p < 0.05) and ranked as follows: alfalfa field > wheat field > bare land. With the increasing surface vegetation, the surface light intensity and topsoil temperature at a depth of 5 cm indicated decreasing trends; the water content in the 0–5-cm soil layer showed an increasing trend, while that in the 0–40-cm layers displayed the opposite trend; the salinity at depths of 0–5 and 0–40 cm indicated a decreasing trend. Correlation analysis showed that there was a significant negative correlation between the vegetation characteristics and the salinity in the 0–5- and 0–40-cm soil layers (p < 0.01), while opposite correlations were observed between the vegetation characteristics and the water content in the 0–5- and 0–40-cm soil layers. Regression analysis showed that a 1% increase in vegetation coverage would decrease the salinity at depths of 0–5 and 0–40 cm by 2.5 and 1.0 uS.cm−1, respectively. In summary, farmland planted with spring-sown crops with short growth periods or abandoned in semiarid and arid irrigated regions would gradually experience an increase in soil salinity, whereas the planting of perennial alfalfa could inhibit and lessen soil salt accumulation at depths of 0–5 and 0–40 cm, which is beneficial to improve the soil quality. In addition, this study also revealed the change rule of soil salts under different LULCs in semiarid regions, the fastest increasing stage of topsoil salts, and the importance of surface vegetation and stubble cover in controlling soil salinization.

APPLICATION OF EXTRASOL ON SOFT WHEAT IN THE CONDITIONS OF KOSTANAI REGION

Studies have been carried out to determine the increase in the resistance of soft wheat variety Omskaya-36 to diseases from the use of the microbiological preparation Extrasol: 2020 - Kostanay district, I-II natural-climatic zone; southern chernozem, heavy loamy, soil solution reaction pH - 8.3, humus content 3.3%; 2022 - Karabalyk district, I-II natural and climatic zone; ordinary chernozem soil solution pH - 7.2, humus content 3.5%. To determine the effectiveness of the microbiological preparation Extrasol on the restraint of the spread and development of diseases, field plots were selected with annual sowing of spring wheat (monoculture).It was determined that the use of the microbiological preparation Extrasol reduced the suppression of the most common diseases in the conditions of the Kostanay region on spring wheat, and timely treatment made it possible to block the development of pathogenic diseases, which ensured the further development of plants.

Influence of sowing time on the yield of spring wheat in Northern Kazakhstan

The research was carried out in order to determine the most optimal terms of sowing spring wheat when cultivating on a stubble precursor in the conditions of southern chernozems of the Kostanay region. The terms of sowing of spring wheat of the «Omskaya 18» variety were studied: May 15 (control), May 18, May 22, May 25, May 27, May 30 and June 05 in the fields of the 4-field grain-steam (steam – wheat – wheat – wheat) crop rotation.Soil cultivation technology- No-till.Records and observations were carried out according to the standard generally accepted methodology. An agrochemical survey at the experimental site showed that before sowing, the soil supply with nitrate nitrogen was characterized as low, mobile phosphorus – average, and exchange potassium – very high. On average, for the 2018-2020 years of research, the reserves of productive moisture in the soil during the sowing of spring wheat were characterized as good. It was found that the low on average 1.47t/ha, yield of spring wheat at the early sowing date of May 15, 2020, was primarily due to the lack of productive precipitation and high temperatures, which fell on a critical phase of development for the crop, affecting the grain filling. For the period of 2018-2020 years yield apparently were increased. As a matter of fact results get up to +0,43 t/ha for per hectare from 25th may and get up to 1,90-1,99 tons for per hectare in average. It was revealed that the sowing dates are reflected on the quality. So, an early date decreases the full-scale grain weight, meanwhile sowing, from 22th May till the 5th June formed the grains of the second class.

Estimation of Parameters of Biomass State of Sowing Spring Wheat

The purpose of this work is to present a new method for estimating the parameters of the biomass of agricultural crops based on Earth remote sensing (ERS) data. The method includes mathematical models and algorithms estimation and has been tested on the example of spring wheat sowing. Sowing biomass parameters are the basis for making management decisions aimed at obtaining a given crop yield. Currently, for these purposes, vegetation indices are most widely used. It is impossible to estimate the physical parameters of the crop sowing biomass using these indices, due to their scalar form and lack of dimension. The paper develops a classical approach to the problem of estimating the parameters of the state of agricultural crops, in which remote sensing data are considered as an indirect measurement of the estimated parameters. The basis for the implementation of the estimation method is the dynamic model of biomass parameters and the remote sensing model, which reflects the relationship between the spectral reflection parameters and the estimated parameters of the crop biomass. The parameters of the dynamic model and the remote sensing model are refined by selective ground measurements in separate elementary sections of the field. The difference between this article and previous works of a similar nature lies in the fact that agricultural crops with a more complex morphological structure are considered as the object of evaluation. In addition, such an important feature of agricultural objects as their spatial distribution is considered here. To take it into account, a new type of mathematical models is used, in which spatial coordinates are introduced. Due to the significant complication of modeling and estimation algorithms based on such models, simpler approximation schemes are proposed. The advantage of the proposed approach is that the assessment is considered as a dynamic process that meets the content of the task of monitoring crops.

Principles of formation of field crop rotations in the conditions of the forest-steppe of western Siberia

The article analyzes soil and climatic zoning of the territory of the forest-steppe of Western Siberia, population degree, contour of fields, biological economic features of crops, including the leading - spring wheat. The adaptive landscape approach to the zonal features of crop alternation was used in the work, which makes it possible to determine a reasonable ecological niche for each one, select crops in accordance with biological requirements, productivity, profitability of production, as much as possible to reduce repeated and monocrops. Monitoring of economic activity over the past 35 years has shown a tendency for commodity producers to be stratified by resource capabilities, technical equipment, and, above all, the level of agriculture intensification. In this regard, recommendations for optimizing field crop rotations are focused on expanding to 8-10 crops and adaptive varieties, considering their profitability and "soil improvement", limiting resowing, excluding continuous cultivation of agricultural crops. In conditions of limited intensive agriculture, about 5-10% of the arable land area belongs to crop rotations with winter, tilled crops, legumes, melilot, rapeseed, millet, clover, annual multicomponent grasses, the efficiency of which in terms of the yield of fodder units often surpasses grain-fallow crop rotations with short rotation. It is noted that in recent years, special attention has been paid to alternate crop rotations, which allow, with increase in farming standards and use of intensification means, to slightly reduce the fallow field and optimize the structure of arable land use, to increase the biodiversity of a set of crops and adaptive varieties. The tendency to switch to rotation crop, among commodity producers of a more humidified forest-steppe zone, is possible only with the use of fertilizers and the improvement of agrophytocenoses. The expansion of alternate crop rotations and the reduction of repeated sowing of spring wheat is also due to positive changes in hydrothermal conditions in arid soil and climatic zones of Western Siberia.

Impact of repeated and unchangeable sowing of spring wheat in the forest steppe of Western Siberia

An important negative impact on the decrease in the yield and quality of grain of grain crops, is a violation in the use of the structure of arable land, the selection of predecessors, including fallow, the expansion of repeated sowing of these crops, especially spring wheat. This trend in the soil and climatic zones of the Omsk region. The research was carried out in the Omsk region according to the generally accepted current methods. Without the use of chemicals, there is a steady pattern of grain yield decrease when the crop is removed from the steam predecessor on average from 2.02 to 1.07 t / ha, or by 47%. With the complex use of chemicals, a significant increase in yield (up to 3.33 t / ha) was observed by 2.16 times. It was found that on repeated sowing of spring wheat, the productivity of the crop relative to the fallow predecessor decreases on average from 3.02 to 1.88 t / ha, or by 61%. Against the background without chemicalization, grain yield was only 1.08 t / ha. With the combined use of intensification means, improvement of the conditions of mineral nutrition, more favorable phytosanitary conditions in the agrophytocenosis, an increase in the productivity of spring wheat to 2.64 t / ha is noted, however, it is more than 1.5 times inferior to the steam predecessor with the advantage of the moldboard and combined tillage system in crop rotation.

Influence of subwinter sowing period of spring wheat on efficiency of using water component in arid conditions of Orenburg Cis-Urals

In the arid conditions of agriculture in the Orenburg Cis-Urals, the level of development of crop production and the state of agriculture as a whole largely depend on the water component. The applied technologies and methods of soil cultivation do not ensure the most efficient use of water resources and the natural potential of the region. In order to develop and improve technologies for the effective use of the water component in arid agricultural landscapes, the article studies the use of available water resources by spring wheat sown in the traditional spring and subwinter way.

ВЛИЯНИЕРЕЖИМОВРАБОТЫПОСЕВНЫХАГРЕГАТОВНАКАЧЕСТВО ПОСЕВА, ВОДНЫЙ РЕЖИМ ПОЧВЫ И УРОЖАЙ ЯРОВОЙ ПШЕНИЦЫ

One of the promising directions for the development of crop production under present-day conditions is the im-provement of agricultural technologies of crop cultivation. Sowing is the most important technological operation; its quality largely determines the achievement of high yields. In this regard, the type of the seeding working body and the operating modes ofthe machine-tractor unitssignificantly affect the energy and agrotechnical characteristics of the sowing. As a result, it becomes necessary to substantiate the zonal parameters and operating modes of the sowing units taking into account the agronomic, technical and eco-nomic indices. The experiment was carried out on the farm of the OOO KKh “Zaytsev” in the Tyumentsevskiy District of the Altai Region. Based on the implementation of the field experiment using the planning of the experiment, a quantitative assessment of the effect of the speed opera-tional modes of the John Deere 730 and John Deere 1890 seeding units on the quality of spring wheat sowing, soil water regime and the yield was obtained. Each unit operat-ed at 4 levels of travel speeds. As a result, a technical and economic assessment of the compared sowing options was given. The results obtained will serve as the basis for substantiating the parameters and operating modes of the sowing units under operating conditions.

Species composition of Ground beetles (Coleoptera: Carabidae) on spring wheat in the Right-Bank Forest-Steppe of Ukraine

Goal. To clarify the species composition of carabids in spring wheat agrocenosis, to determine the dominant species, to compare the number of ground beetles on application of mineral fertilizers and organic nutrients.&#x0D; Methods. Field method — accounting of insects on the sowing of spring wheat in accordance with generally accepted methods. Laboratory method — determination of the species composition of ground beetles. The study was conducted in 2017—2019 on the basis of National Research Center «Institute of Agriculture of NAAS of Ukraine», department of plant protection against pests and diseases (Chabany, Kyiv-Sviatoshynskyi district, Kyiv region).&#x0D; Results. The species composition of carabid beetles on the sowings of spring wheat under modern conditions has been specified. 41 species of ground beetles from 15 genera were found. On application of mineral fertilizers, the dominant species were Bembidion properans Stephens, 1828, Harpalus affinis Schrank, 1781, Harpalus rufipes De Geer, 1774, Poecilus cupreus Linnaeus, 1758, Harpalus distinguendus Duftschmid, 1812. H. affinis Schr., H. rufipes Deg., H. distinguendus Duft., P. cupreus L., Calathus fuscipes Goeze, 1777, Harpalus smaragdinus Duftschmid, 1812 were dominant species on application of organic nutrients. In both variants, Broscus cephalotes Linnaeus, 1758, Poecilus punctulatus Schaller, 1783, Poecilus versicolor Sturm, 1824, Microlestes minutulus Goeze, 1777 were subdominant species. The ratio of trophic groups of carabid beetles in the agrocenosis of spring wheat has been established. The seasonal dynamics of the number of ground beetles has been reflected.&#x0D; Conclusions. In the first variant (mineral fretilizers) 40 species of carabids were registered, in the second (organic nutrients) — 35. Among all identified species (according to trophic specialization) the number of phytophages and zoophages was similar — 21 and 19, but in the experimental variants their ratio differed. The average number of ground beetles during 2017—2019 was: variant 1 — 30.8 specimens per trap, variant 2 — 28.1 specimens per trap.

GIS-BASED MULTI-CRITERIA ANALYSIS OF THE SUITABILITY OF WESTERN SIBERIAN FOREST-STEPPE LANDS

ABSTRACT The main purpose of this work is to assess the suitability of land for cultivation of the main agricultural crop of Western Siberia, namely spring wheat. The algorithm of land suitability assessment was developed on the territory of the test plot of land-use of CJSC Mirny, Kochenevsky District, Novosibirsk Region. For assessment of land suitability on the basis of expert knowledge, criteria related to relief and soil, not only known but also specific, inherent in the area under consideration, have been identified. In the absence of information on the topography and relief of the territory under consideration, the spatial database of geodata was created based on the results of high-resolution digital aerial photography from an unmanned aerial vehicle (UAV). Elementary surfaces (ESs) at the micro-relief level have been determined with the help of GIS tools. Two most popular methods of obtaining criterion weights have been analysed: Analytic Hierarchy Process and the direct ranking method, and under certain conditions, a connection between these methods have been established. To assess the land suitability, the land suitability indices of selected ESs were calculated using GIS-MCDA (Multiple-Criteria Decision Analysis) method Weighted linear combination. Based on the value of land suitability index for all ESs, belonging to a certain suitability class according to FAO classification has been established. A map of land suitability with an assessment of spring wheat sowing expediency was obtained.

The role of nectariferous plants in the attraction of coccinellids (Coleoptera: Coccinellidae)

Goal. To evaluate the role of nectarines in attracting coccinellid in the agrocenosis of spring wheat.&#x0D; Methods. Field experience on the effect of nectarines to attract coccinellid; accounting ladybirds on the plot of nectarines and sowing of spring wheat in accordance with standard methods; laboratory — determination of species composition of ladybirds. The study was conducted in the 2017—2019 years. at the experimental field of the National scientific center «Institute of agriculture of NAAS of Ukraine» in the Department of plant protection against pests and diseases (Kiev region, Kiev-Svyatoshinsky district, town Chabany).&#x0D; Results. Updated the species composition of coccinellid in modern conditions on nectarines. Identified eight types of ladybirds, among which Coccinella septempunctata Linnaeus, 1758 and Hippodamia variegata Goeze, 1777 are the dominant species. Reflected seasonal population dynamics of ladybirds. Identified a high effect of attracting coccinellid on the dill, where their average number was much higher than on some other options. Given the average number of ladybugs on spring wheat during the accounting period.&#x0D; Conclusions. Considering the useful role of representatives of the family Coccinellidae (Latreille, 1807) on crops, it is necessary to improve the practical use of entomophages and engaging coccinellid in agrocenoses with overseeding nectarines. Culture that attracts the entomophagous defined by dill (40.0 specimen/100 sweep net). More diverse species composition was observed coccinellid on Vick spring (six species). The average number of ladybirds over the growing period of spring wheat amounted to: land adjacent to nechernozeme to 16.7 ind./100 sweep net, control of 9.4 ind/100 sweep net. Such an advantage underscores the need of interplanting of plants that attract coccinellid in agrocenoses.

The Influence of Tillage and Cover Cropping on Soil Microbial Parameters and Spring Wheat Physiology

The soil tillage system and the distribution of stubble catch crops increase the content of organic carbon, thus increasing the biochemical activity of soil. The aim of the study was to assess the impact of leguminous cover crops and different tillage soil systems before spring wheat sowing on the count of soil microorganisms, biochemical activity, microbiological diversity and the physiological state of the plants in correlation with yield. The study compared and analysed the following systems: (1) conventional tillage (CT) to a depth of 22 cm, followed by spring wheat sowing using four simplified cultivation technologies called conservation tillage. The following simplified tillage systems were evaluated: (2) skimming before sowing the cover crop and spring wheat sowing after ploughing tillage (CT), (3) skimming before sowing of the cover crop (sowing wheat with no-till technology (NT)), (4) direct sowing of ground cover plants (NT) and spring wheat sowing after ploughing cultivation (CT) and (5) direct sowing of cover crop (NT) and sowing wheat directly into cover crop (NT). The results showed that applying the cover crop and soil tillage method before sowing wheat improved all tested parameters. The highest values of the analysed parameters were observed in the treatment with soil skimming before sowing of the cover plant, and then with sowing the wheat directly into the mulch. The activity of dehydrogenase was 90% higher, while the activity of phosphatase was 32% higher, in comparison to the control group. Both the activity of catalase and the biological index of fertility were 200% higher, in comparison to the control group. Metagenomic analysis showed that soil bacterial communities collected during treatment ‘zero’ and after different cultivations differed in the structure and percentage of individual taxa at the phylum level.

Climate and weather of the Southern Urals and their influence on agronomy

Changes in climate, precipitation and air temperature in the Southern Urals over the past 133 years are considered. A decrease in the climatic norm of atmospheric precipitation by 24 mm and an increase in the air temperature in the region by 1.2 º C were revealed. The main decrease in precipitation occurred during the growing season of early crops, and air temperatures in the autumn-winter period, which significantly changed the conditions for agronomy. The increasing aridity of the climate has worsened the conditions for growing spring crops. The applied system of rain-fed agriculture in Orenburg region provides the use of only 30–40% of annual precipitation. Early winter sowing of spring wheat in frozen ground with snow cover up to 10–15 cm is proposed. With them, seed germination, seedlings and tillering of plants are well provided with moisture and have favorable temperature conditions in April-May. Plants with a strong root system can get soil moisture up to 1.5 meters deep and effectively use small precipitation in June and July, which mainly moisturizes the soil to a depth of 5 cm. Early winter sowings of spring wheat are less susceptible to droughts, Favorable soil moisture and air temperature in the spring provide early shoots, plant development and 1.5–2-fold increase in yield. With early winter sowings, the efficiency of using annual precipitation increases to 50–55%.

Consumption of Soil Nitrogen by Plants under the Application of a Mineral Fertilizer, Green Manure, and Biopreparation (the study involves 15N)

The use of soil nitrogen by spring wheat plants in sod-podzolic medium loamy soil enriched with a stable nitrogen isotope 15N was researched in a model experiment involving the application of ammonium nitrate and white mustard biomass and seed inoculation with associative nitrogen fixer Rhizoagrin. It is established that plants primarily consume nitrogen contained in the recently applied mineral fertilizer. After the application of white mustard biomass and seed inoculation with Rhizoagrin, spring wheat consumes soil nitrogen; after the combined application of the above components and ammonium nitrate, spring wheat consumes both soil nitrogen and nitrogen contained in the fertilizer. The plant biomass accumulation increases predominantly due to nitrogen contained in the recently applied mineral fertilizer, regardless of whether it was applied separately or in combination with green manure and seed inoculation with the biopreparation. The increase in the plant biomass accumulation reaches 14–28% in comparison with the control variant (no fertilizers). After the application of the nitrogen fertilizer, either separately or in combination with green manure and the biopreparation, the concentration of nitrogen in spring wheat increases by up to 1.5 times. A clear upward trend is observed in relation to the nitrogen concentration in plants after the application of white mustard biomass and seed inoculation with Rhizoagrin. As a result, the total nitrogen accumulation in plants increases twofold after the application of the nitrogen fertilizer and by 1.2 times after the application of white mustard biomass and seed inoculation with the biopreparation. This is due to the presence of nitrogen compounds available to plants in the growing medium. The accumulation of 15N in plants characterizes the consumption of soil nitrogen by them. This parameter decreases after the application of the nitrogen fertilizer and remains equal to that in the control variant (no fertilizers) after the application of white mustard biomass and Rhizoagrin. This indicates that plants consume large amounts of mineralized soil nitrogen after the application of the two latter components and that nitrogen fertilizer is not a factor in the mineralization of soil organic matter. The application of white mustard biomass prior to spring wheat sowing and inoculation of its seeds with Rhizoagrin ensure that plants consume soil nitrogen in the initial vegetation period.

Weed infestation and yielding of spring wheat sown in different soil tillage systems

Weed infestation and yielding of spring wheat sown in different soil tillage systems

Critical Values of Soil Physical Quality Indicators Based on Vegetative Growth Characteristics of Spring Wheat (Triticum aestivum L.)

This study was conducted to determine critical values of soil physical quality indicators according to vegetative growth of spring wheat in a range of degrees of soil compactness. A non-saline loam soil was used to produce a range of degrees of soil compactness in 10 mini-lysimeters. The mini-lysimeters were put outdoors and received similar amounts of water after sowing of spring wheat (Triticum aestivum L., cv. Pishtaz). Shoot dry weight (SDW) was measured, and relative SDW (RSDW) values of 0.9 and 0.8 were assumed to be the starting and end points of soil physical quality indicator limitation for wheat growth, respectively. Critical integral water capacity (IWC) values of 0.136 and 0.104 cm3 cm−3 were obtained for the start- and end-point limitations, respectively. This means that in the studied soil, the IWC values greater than 0.136 cm3 cm−3 represent good soil physical conditions for wheat growth. In the IWC range of 0.136–0.104 cm3 cm−3, there were slight physical limitations for wheat growth. In the IWC values smaller than 0.104 cm3 cm−3, unsuitable soil physical conditions (i.e., poor aeration and high mechanical impedance) strongly restricted the wheat growth. Start- and end-point limitations for Dexter’s index of soil physical quality (S) were found to be 0.051 and 0.038, respectively. Corresponding values for relative bulk density (RBD) were 0.805 and 0.846, respectively.

Effective fertility in direct sowing of spring wheat in the middle Volga region

It is given the impact of direct sowing technologies with different levels of intensity of arable land use, in comparison with the traditional tillage, on the elements of fertility of ordinary chernozem and productivity of spring durum wheat in the middle Volga region. The complex application of direct sowing technology using straw as fertilizer stabilizes with traditional technology the supply of soil with nitrogen, increases the content of mobile forms of phosphorus in it by 1.5-21.2%, potassium exchange – by 10.4-18.3%. Improving the nitrogen regime of the soil in direct sowing, in which the starting doses of nitrogen fertilizers were combined with integrated plant protection, provided the highest grain yield – 1.76-1.79 t/ha, which is 0.41-0.44 t/ha (30.4-32.6 %) higher than the control. The increase in yield from the use of biological products was 0.15 t / ha (11.9 %), nitrogen fertilizers N30 – 0.17 t/ha (13.4 %), the combined use of fertilizers and insecticides 0.50-0.53 t/ha (39.7-42.0 %). The highest cost recovery was after direct sowing with a maximum level of intensification-1.98-2.02 rubles/ha, which is 0.14-0.32 rubles/ha higher than the other options. The smallest economic indicators obtained in the control to 1.54 rubles/ha. According to the results of research with direct seeding of spring durum wheat in the region is proposed on the background of integrated plant protection application of calculated doses of mineral fertilizers on yield of 2.0 t/ha (pre-sowing, local-band application).

THE IMPACT OF SOIL TILLAGE AND FORECROP ON AGRICULTURAL PHYSICAL PARAMETERS AND CROP YIELD OF SPRING WHEAT IN THE NORTHERN PART OF KAZAKHSTAN

The research was carried out on the carbonate black soil of Akmola region in two five-field crop rotations in 2010-2016. The scheme of the experiment included the following ways of soil tillage: deep flat-cutting DF-3-5 (at a depth of 25-27 cm), surface flat-cutting KPSSH-9 (at 10-12 cm), para ploughing SHR-4.5 (at 25-27 cm) and No-till . The researchers observed the highest moisture reserves in the soil layer of 0-100 cm for 7 years in the variants with deep flat-cutting tillage and para ploughing: 115.6 and 112.6 on steam, 108.5 and 105.4 mm on pea. The lowest amount of moisture (80.4 mm) was observed in No-till treatment. The density of the arable soil layer of the southern carbonate black soil before spring wheat sowing corresponded to the appropriate values. When experiencing mechanical treatment, the density of arable layer varied from 1.23 to 1.26 g/cm3; in No-till variant it was 1.31 g/cm3. The concentration of valuables in the variants with deep and surface mechanical tillage varied within 70.9-75.6%, when No-till method was applied, the parameter reduced to 64.5 - 61.5%. The yields of spring wheat sown on steam varied within 1.70 - 1.82 t/ha and did not depend on the soil tillage., Regardless the soil treatment, cultivation of wheat after peas reduced grain harvest on 0.12 - 0.27 t/ha in comparison with steam variant. The authors didn’t observe reliable differences in the crop yield between the first and second crops of grain-steamed crop rotation when applying mechanical soil tillage. In the No-till system there was a reliable decrease in wheat yield on 0.24 t/ha.

ПІДВИЩЕННЯ ЕКОНОМІЧНОЇ ЕФЕКТИВНОСТІ ВИРОБНИЦТВА ЗЕРНА В АГРАРНИХ ПІДПРИЄМСТВАХ МИКОЛАЇВСЬКОЇ ОБЛАСТІ

Abstract Introduction. Attention to grain production is driven by its strategic importance within Ukraine's agro-industrial complex, as its products are critically important as key foodstuffs to support the life. The purpose of the article is to substantiate the economic efficiency increase of grain production in agricultural enterprises in the Mykolaiv region in modern conditions. Results. The general characteristic of the Mykolaiv region agriculture is given. The essence of the concept of «economic efficiency» is revealed and the indicators of its measurement for food grain are proposed. Indicators yield grain crops to the dynamics are considered, outlining the growth of spring wheat, but the reduction millet and buckwheat. The economic efficiency analysis of grain production in agrarian enterprises of the Mykolaiv region has been done for the studied period by the following indicators: yield, cost of 1 centner of production, average selling price, profit, profitability. As a result of the combined impact of rising cost and price, profitability declined by 8% to 25.7% in 2017. The role of scientifically grounded structure of acreage is considered in ensuring efficiency of agricultural enterprises management based on crop rotation of different soil and climatic zones of Ukraine as a form of organization of their alternation in cultivation. Construction parameters for economic and mathematical model of acreage areas optimization of grain crops in agrarian enterprises of Mykolayiv region are presented. Conclusions. As a result of the proposed model calculation, optimized values of the specific gravity of the acreage under different crops have been obtained: the sowing of spring wheat will increase by 10% and the smallest – peas by 2%. It is proposed to reduce the acreage under winter wheat by 14% and spring barley by 8%. Such changes will have a positive impact on sales revenue, product cost, and overall profitability. Keywords: agrarian enterprise, grain crops, economic efficiency, intensification of grain production, yield, cost, profit, level of profitability, economic and mathematical model.