The article presents the results of studying the effect of slope soil fertility and fertilizers on crop legume- grass mixtures with Lucerne and lotus horned. It is established that there is an advantage based on alfalfa grass mixture. It is observed on the average, and the bottom of the slope with a slope 3,0–3,5 °. Only due to the fertility of the soil get dry mass of alfalfa 56,8–64,4 c/ha. A further increase in the harvest provided phosphate and potash fertilizers. Almost equivalent gain obtained by partial replacement of potassium chloride sylvinite.

Overcrowding of crops to 120 thousand plants per hectare in FАО 200-290 maize hybrid cultivation on cohesive sandy loam soils provides maximum herbage and dry matter yield. However, for maximum exchangeable energy yield, the optimum plant density is 100–120 thousand plants per hectare for Polesski 195 mid-early hybrid and Bestseller 287 middle-late hybrid, and 80–100 thousand plants for mid-ripening Belkos 250.

Studied influence of regulators of growth of plants on elements of structure of a crop winter rapе. Regulators of growth of plants raised weight of 1000 seeds on 0,2–0,3 г and weight of seeds from one plant on 1,4–1,9 the Maximal biological productivity of oilseeds (46,6 μ/hectares) winter rapе grades the Leader forms at entering nitrogen in the form of sulfate of ammonium in a doze of 100 kg/hectares in the beginning of renewal of spring vegetation of plants, in a doze of 30 kg/hectares in a phase the beginning of a budding and in a doze of 30 kg/hectares in a phase full budding in a combination with boron a pine forest and a regulator of growth maltamin.

The article deals with the results of the research of the influence of density plant sugar sorghum of the variety Silosnoe 42 and hybrid Medovyj productivity and carbohydrate composition in the foreststeppe of Ukraine. It was found that the highest productivity of sugar sorghum biomass observed in the variants with a width of 30 cmrow spacing and plant population of 300 th. pc./ha – 84,2 t/ha in varieties Silosnoe 42 and 97,5 t/ha in the hybrid Medovyj. The maximum productivity of dry matter is also provided at the plant population of 300 300 th. pc./ha and row spacing of 30 cm and 22,3 % in grade and 26,5 % in the hybrid. The total sugar content was observed in varieties Silosnoe 42 – 17,8 % and the hybrid Medovyj – 20,7 % experience the seem bodiments.

Results of researches of biological features of reaction of young plants Sinaois arvensis L. on the induced dis-stresses are resulted.

The technique and the scheme of researches provided by purpose fuleasing of a falling stream of energy of HEADLIGHTS that reache stoplants in a vegetation in itial stage, to estimate its influence on indicator sof biological efficiency Sinapis arvensis L.

Level change induced dis-stresses depending on depthof power deficiency in a vegetation in itial stage is defined. By researches it is established that the deep induced dis-stresses in the initial stages on to genesis even after the termin ation to chadetill the end of vegetation essentially reduced ability to form height, the are of leaves, to accumulate elevated weight and to form seeds.

The research results on embryologic and pollen tests of materials of apozygotic reproduction, and the possibility of transferring apozygotic elements to O-types and their CMS analogs valuable for the combination ability are presented in the article.

In the article presents information on the efficiency mineral and organic fertilisers on highly long-cultivated sod-podzolic light loamy soil, the optimal dose loads of fertilizers to ensure the profitability of corn cultivations for green mass.

The experimental data based on fundamental researches on determining the relationship value between the internal energy of mineral crystal grid fraction >0,001 mm of soil to the internal energy of mineral crystal grid fraction <0,001 mm (soil absorbing complex) and their relationship regulation create the basis of soils improvement.

The stated method gives an opportunity to regulate water – physical, chemical and biological peculiarities of soddy-podzolic soils both of light and hard granulometric composition in the way of their optimization for plants growing.

In the article the formulae for calculation the applied components amount and also their specific values for different granulometric composition in 50 cm, 25 cm and 20 cm soil layers are presented.

It is determined in a long stationary experiment that the efficiency of agricultural crops growing depends both on fertilizer application system and methods of main soil tillage. Use of mineral fertilizer system have increased crop rotation link productivity (barley-spring wheat – corn) on the average for 51 %, organomineral with manure application - for 80, straw – 63%. Against non-mouldboard (minimal) and zero soil tillage the agricultural crops productivity was 16% higher than against mouldboard traditional.

The analysis of many years data on biological, farming and economic efficiency of a wide modern fungicides assortment in grain crops protection against the dominant diseases is presented in the article, the efficiency differentiation not only against the agent but the crop on which it develops is shown. A strategy of fungicide selection is substantiated.

The results of field experiments on the effectiveness of the herbicide soil action Callisto, SC (mesotrione, 480 g/l) in the norm of 0,15–0,30 l/ha in crops of oilseed flax. Under the conditions of optimum soil moisture drug is effective against annual dicotyledonous weeds. With a lack of moisture in the soil layer of 0–5 cm on the effectiveness of the Callisto weed control is reduced and there is a need for a post-emergent herbicide action. Application of Callisto in crops of oilseed flax in phase «herringbone» is not effective.

The evaluation of a biological efficiency of a new systemic insecticide plenum, WDG (pimetrozin, 500 g/kg), belonging to pyridine class to control greenhouse whitefly (Trialeurodes vaporariorum Westw) in protected ground crop is done. The biological efficiency of a preparation against greenhouse whitefly at the rate of 0,6 kg/ha on the 14-th day after two times treatment fluctuated from 87,8 to 90,9 %.

Based on the obtained data the preparation plenum, WDG (pimetrozin, 500 g/kg) is recommended for application in protected ground cucumber crop against greenhouse whitefly at the rate of application 0,6 kg/ha (0,06% working solution). Method of application – plants spraying during vegetation. Working solution rate use – 1000 l/ha. Number of treatments – 2 times with 7–10 days interval.

The biological and economic efficiency of fungicides (Quadris, UK and Bellis EDC) against powdery mildew (Erysiphe umbelliferarum DB. f. dauci) on the carrot was evaluated. There was a reduction of disease progression in double treatment by fungicide Quadris, SC in 4,9–10,7 times, Belis, EDC – in 9,6–17,8 times compared with the control.

Yields of carrots with a double application of fungicides Quadris, UK and Belis, EDC 32.5 and 50.0 t / ha or 7.5 and 11.6% higher than in the control group, respectively.

Shows the species composition and systematic position internally stem herbivores, which together cause significant damage to grain crops. In Ukraine the most common are: Maytiola destructor Say, Oscinella frit L., O. pussilla Mg., Phorbia securis Tien., Phorbia genitalis Schnall., Meromyza nigriventris Meg., Chlorops pumilionis Byerk., Opomyza florym F., Opomyza germinationis L. Recommended system control (crop rotation, tillage spiked cereal crops, seed treatment, protective and stimulating combinations).

There are results on the effect of nanoakvahelat citrate Ge, citrate Se and citrate Zn on embryogenesis, postembryonic development, female fertility and vitality in adulthood and reproduction of Masrolophus nubilis H.-S. Experimentally it was demonstrated the possibility of a full-fledged breeding of local zooculture of predatory bedbug Macrolophus nubilis H.-S. on artificial diet supplemented with biogenic chemical elements citrate Ge, citrate Se and citrate Zn.

It is determined that a new fungicide Zarnitsa, SC «Frandesa» OOO Co., by its application at flag leaf stage in winter wheat crops at the rate of 0,5 and 0,75 l/ha by biological efficiency against powdery mildew (100 % in 2013, 87,6-91,2 in 2014) and against Septoria leaf spot (68,9-72,8 % in 2013, 33,3-40,9 % in 2014) is not inferior to the preparation Proton, SC – 0,75 l/ha and allows to preserve grain yield in the range of 13,2...18,4 % what gives an opportunity to recommend it for the crops single treatment under conditions of the moderate-depressive leaf apparatus diseases development.

The article presents the results of studies on the effect of productivity of flax straw, wrap and degreeof aging of flax stock on flax fiber quality and its technological characteristics.

It was found that to obtain high-quality fiber number 12 and above, including its color it is necessaryto wrap flax strawone or two times, maximum, three times depending on the prevailing weather conditions during aging of flax stock.

To obtain high-quality fiber number 12–13 raise of stockshould be carried out at rates of separabilityoffiber from wood 4,1–7,0. Harvesting reduces the strength of the fiber and thenumber under the separability index of fiber from wood more than 7,1–8,1.

The results of researches are presented on influence of complex application of facilities of chemicals to improve the germination and seed vigor, yield and fruit quality of watermelon and cantaloupe at cultivation in the open field and greenhouse. The highest average yield obtained for 2 years in a joint application of macro- and micronutrients and biologically active substances – 38.4 t/ha watermelon fruit and 26,1 tons / hectare melon fruits, which is higher compared with the background for this, respectively, 8,7 and 4,3 t/ha. Reduction of nitrate to 3–12 mg/kg wet weight of fruit melons provide a combined application of micro- and macrofertilizers with biologically active substances.

In the article the information of main agro techniques influence on winter barley grain yield is presented. Based on generalization of obtained results the recommendations are given on optimization the main elements of this crop cultivation technology in relation to soil climatic conditions of Belarus.