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 article presents the results of a 3-year study on the influence of fertilizers and quality of feed, harvested from different types of feed mix.

The article presents, according to a comparative assessment, the results of effectiveness of the interaction of calculated mineral fertilizers with various bioagents and adaptogenic preparations in spring rape crops. The studies were conducted on the experimental field of Chistopol State Breed Center of the Republic of Tatarstan. The following strains of microorganisms were used in the studies: RECB-95 B (Bacillus subtilis); RECB-50V (Bacillus spp.). Seed treatment with the aforementioned bioagents was carried out on the day of sowing, and foliar top dressing was performed in the phase of 3-4 pairs of real spring rape leaves. The predecessor of the research object was pure steam. In the experiment, a cultivar of Gedemin spring rape of the Belarusian selection was cultivated. Mineral fertilizers were applied as a general background before sowing with the expectation of a planned productivity of 3.0 tons per hectare of oilseeds of the studied crop. The repetition of the experiment is fourfold, the plot area is 32 m2. To reduce the chemical load on the environment, to save money, to fully realize the potential possibility of calculated norms of mineral fertilizers on leached chernozems of the Republic of Tatarstan in order to obtain 3.28-3.37 tons per hectare of oilseeds of spring rape, it is recommended to pre-sow seeds with strains of RECB-50 In (2.0 litres per ton) or RECB-95 V (2.0 litres per ton) in combination with foliar application in the phase of 3-4 pairs of real leaves with the same strains (norm 1.0 litres per hectare consumption) with the addition of an adaptogenic drug.

We can expect to receive from 0.81 to 0.97 tons of sunflower oil seeds per hectare in the soil-climatic conditions of the forest-steppe zone of the Middle Volga region without the introduction of mineral fertilizers. As the doses of mineral fertilizers are increased, the productivity of 1 hectare of arable land is increased 2.8 times and the gross collections of oilseeds are 2.14 tons per hectare at the non highest background of mineral nutrition, against 0.86 tons per hectare in the control variant of the experiment (without fertilizers). The optimization of seeding rates of the studied culture is of great importance in the formation of highly productive agrocenoses. In the variants of supplementary supply of plants with nutrients, especially when N98P38K124 is introduced, the seeding rate of 70 thousand pieces per hectare of virgin seeds raises the yield of sunflower by 0.51 tons per hectare (a very solid increase in yield), compared with the sowing rate of 60 thousand pieces per hectare.

In order to increase the economic efficiency of oilseeds production in the soil and climatic conditions of the Republic of Tatarstan in 2020-2022 a comparative assessment of the chemical and biological system of sunflower protection from basket rot was carried out. The scheme of the experiment included the following options: background nutrition (factor A) - without fertilizers (control), N104P50K106 (for a planned yield of 2.5 t/ha), partial replacement of mineral fertilizers with a biopreparation Biostim oil (N52P25K53 + foliar top dressing Biostim oil 3 l/ha in the budding phase); protection system (factor B) - seed treatment with chemicals Imidor Pro, KS, 15 l/t + Scarlet, ME, 0.4 l/t (control); treatment of seeds with biological preparations (Nodix Insectobact, 2 l/t + Nodix Biofungicide, 0.5 l/t); spraying crops in the phase of sunflower budding with chemical plant protection products (Mystery, ME, 2 l/ha + Karate Zeon, 0.15 l/ha); spraying crops with biological preparations (Nodix Insectobact, 2 l/ha + Nodix Biofungicide, 0.5 l/ha). The biological system for protecting sunflower from basket rot and replacing part of the mineral fertilizers with the biopreparation Biostim oil had high efficiency: treatment of crops with Nodix Biofungicide, 0.5 l/ha in combination with Nodix Insectobact, 2 l/ha against the background of N52P25K53 + Biostim oil, 3 l/ha ha, on average, ensured the collection of 2.31 t/ha of sunflower oilseeds. Spraying of crops with biological preparations from basket rot in combination with foliar top dressing with a fertilizer-stimulating composition Biostim oilseed made it possible to obtain 22.5 thousand rubles/ha of net profit, the profitability was 53.6%, the cost of production of 1 ton of oilseeds was 18.3 thousand rubles. rub. at a selling price of grown products of 28 thousand rubles.