The research was carried out in order to study the effect of top dressing with liquid fertilizers on mineral nutrition, yield and quality of seeds of winter wheat of Kazanskaya 560 varietiy in seed crops. The work was carried out in 2017–2020 in Kama zone of the Republic of Tatarstan on gray forest soil, characterized by a very low supply of molybdenum, low - zinc, high - copper and manganese, very high - boron. Liquid fertilizers of the Metallocene series containing macro- and microelements were studied. Top dressing was carried out in three terms: the first - in the autumn period with manganese-containing fertilizer Metallocene D with a norm of 1.0 l/ha, the second - during the spring regrowth, the third - in the heading phase with fertilizers with copper (grade A), zinc (grade B), molybdenum and boron (grade C) at rates of 1.0 l/ha. The consumption of working fluid during spraying is 200 l/ha. In 2018 and 2019 dry conditions were noted, in 2020 - favorable for winter wheat. Double foliar application with zinc fertilizer increased the yield by 0.18 t/ha, boron and molybdenum - by 0.16 t/ha. Autumn top dressing with manganese increased the grain harvest by 0.67 t/ha, and against its background with molybdenum-boron fertilizer - by another 0.15 t/ha. Foliar feeding led to an increase in the content and removal of phosphorus from 1 ton of winter wheat seeds. Microfertilizers increased the laboratory germination of seeds of a new crop by 3.1...5.4%, and also reduced their infection with phytopathogenic micromycetes by 1.2...23.0 times. The minimal infection of the seeds of a new crop with fungi causing root rot in the experiment was noted when using the copper-containing fertilizer Metallocene against the background of the autumn application of manganese. The most cost-effective on seed crops of winter wheat were double foliar feeding with molybdenum and boron in combination with the autumn application of manganese (profitability - 71%, against 39% in control).

The paper presents an assessment of the state of the soil after harvesting crops (cereals, legumes, technical, perennial grasses) on the experimental fields of the Agrobiotechnopark of Kazan State Agrarian University in industrial crops. The studies were carried out in 2022, which was characterized by significant differences in moisture conditions during the growing season of plants (the first half of the growing season is wet, the second half is dry). All plots were located on highly cultivated, gray forest, medium loamy soil. A comprehensive assessment of soils was carried out using the methods of agrophysical studies of soils and methods of soil biology. To assess the state of soil biology, the number of microorganisms, Protozoa and nematodes was taken into account. Simultaneously, the phytotoxicity of soils for model plants was determined. Analysis of the accumulation of available water in the soil and the share of agronomically valuable aggregates showed that the maximum values were after mustard. After this crop, there was a decrease in the density of soil composition. The deterioration of the agrophysical properties of the soil was noted after spring crops. A pronounced phytotoxic effect of soil extracts after spring barley, peas and potatoes was established in relation to lettuce test plants. A similar effect on the wheat test plant was noted after potatoes. Improvement in agrophysical properties, low phytotoxicity and suppression of the development of Fusarium fungi among the studied crops, the advantage was noted for Sarepta mustard. After peas, an increase in the number of Azotobacter bacteria in the soil was noted, and after winter wheat, an increase in the number of ciliates in the soil was noted. The results obtained confirmed the differences in the state of soils after various crops, which must be taken into account when selecting predecessors in crop rotation.

The most important task at all stages of modern agriculture development is to increase the yield and quality of grain. Plant growth regulators can play a big role in this. The paper considers an impact of Polaris fungicide on winter wheat seeds and the use of growth regulator Melafen in winter wheat crops in Ufa region of the Republic of Bashkortostan are considered. The soil and climatic conditions of the growing season 2017-2018 years have influenced on formation of the yield and quality of winter wheat grain. Seed treatment with Polaris fungicide in combination with the crop care products provided productivity of 41.8-61.5 centner per hectare. The use of growth regulator Melafen in Ufa region of the Republic of Bashkortostan ensured an increase in crop yield up to 59.2-63.7 centner per hectare or 30.3-40.4%, depending on the processing scheme used. Determining the number of falls in the experience showed that this indicator fluctuated within 215-314 sec., which corresponds to the indicators for higher, first and second class of grain - a state of emergency more than 200 sec. In the experiment, the indicators of the nature of the grain had a value of from 671 to 758 g/l. The use of Polaris in the experiment contributed to the enhancement of the grain nature and reaching the level of the highest, 1.2 grade of grain. Due to the fact that in terms of quality group - all the options corresponded to group 2 of quality or grain of grade 3-5, the assessment of the quality of winter wheat grain shows that in the experience the quality of grain of all options corresponds to class 3.

In the soil and climatic conditions of the Laishevsky municipal district of the Republic of Tatarstan, field experiments were conducted on the development of fertilizer systems for grain crops - spring triticale of the Timur variety and chickpeas of the Privo1 variety. Preparations of the "AgroNAN" series were used in the form of leaf feeding in different phases of crop development, and "Metallocene" for seed treatment, which are environmentally friendly micro fertilizers containing trace elements. AgroNAN Active has pesticide properties, AgroNAN Organic leads to an increase in the action of enzymes and assimilation from fertilizers by plants N and P. Metallocene D increases the stress resistance of crops and replenishes the shortage of Mg. Abnormally arid conditions of the growing season of 2021 subjected chickpea beans in the version without fertilizers to premature ripeness and shedding, which led to a decrease in yield. The least cracking of beans was in the fertilized versions. The combined use of Metallocene D (0.3 ml /t) preparations for seed treatment and AgroNAN Active (0.2 l/ha) in the form of leaf dressing during the growing season, with a purchase price for grain – 40,000 rubles / t, made it possible to harvest chickpea grain - 1.91 t/ha, which increased the profitability of production up to 464%. Despite the dry weather conditions, the yield of spring triticale was good, which, with the same background of fertilizers, corresponded to 5.3 t/ha, with a production margin of 292.4%, with a purchase price for grain of 12,000 rubles/t. The indicators of the above fertilized variants exceeded the data of the control variant by more than 1 t/ha.