The article presents the results of researches of influence of application of various doses of macrofertilizer, treatment of seeds and crops with the growth regulator Epin and boric acid presowing inoculation of seeds with bacterial preparations Rhizobacterin and Phytostimophos in the cultivation of buckwheat on the content of the main nutrients in plants, grain and straw of buckwheat.

The relationship between yield and vegetation index for winter wheat was analyzed. Information about the permanent recording of yields, harvested in 2016, for three fields in Minsk and Baranovichi regions was used to write the article. High values of correlation relationship between the data of the mass of harvested grain and the vegetation index obtained from remote sensing data were revealed during the analysis. For data at the end of May, the correlation coefficient may exceed 0.9. It was found also in the course of the study that weed vegetation prevents accurate simulation of yields of winter wheat from space survey data.

The research results on the white lupin morphotype green material productivity element formation from collection samples depending on the plant height and length of late tillers of the first and second order are stated.It is revealed that the group of mid–tall plants (the plant height is 92 cm) forms the green material productivity at the expense of leaves and beans where they are formed haghly as compared with stunted group (the plant height is 72 cm) and tall (115 cm) one.

The article presents results of studying the influence of level of early spring mineral nitrogen reserve in the 0–60 cm layer of swardpale-podzolic light loamy soil on the balance of humus in winter wheat crops.
The research has established that nitrogen fertilizing in winter wheat crops affects both the removal of nitrogen with alienated products and the input and output items of the humus balance. In this case, the output balance of humus in the variants of experiment is determined by the removal of nitrogen from the soil.
It has been established that an increase in the yield of grain of winter wheat is accompanied by an increase not only in the mass of its post harvest residue, but also in the increase in mineralization of humus.

The article presents the results of the evaluation of the most common and new varieties of flax at decortications abilities. The optimal parameters of separability, as well as the approximate period of harvesting of each variety, in which the high quality of the resulting flax fiber is maintained, are determined.

The paper presents the results of a study on the effect of soil exchange acidity on yield and quality of flax products obtained in 2016–2017. The excessive content of carbonates in the soil caused the development of calcium chlorosis of flax fiber, inhibited the growth and development of plants, and reduced the physico-mechanical parameters of the stem. Depending on the exchange acidity of the soil, the shortage of seed yields was at pH_KCl 6,1–6,2 39 %, at pH_KCl 6,3–6,5 – 60 %. Shortage of fiber yield respectively – 17 %, 42, 62 %. With increasing pH_KCl of soil from 5,0–5,5 to 6,3–6,5, the number of long trephine fiber decreased from 12,0 to 8,0 units.

Under small-plot trial conditions the evaluation of the herbicides Stomp professioinal, MC and Gambit, SC biological and economic efficiency in garden carrot crops is done. It has been determined that their use after sowing before the crop emergence contributes to a decrease in number and vegetative weight of annual dicotyledonous and some grass weeds, inhibits their germination within two months after spraying and favorably influences the formation of root crops yield.

The article presents data on the biological and economic effectiveness of seed disinfectantsin the protection of spring durum wheat from root rot. The high fungicidal activity of the preparations on the prevalence and development of root rot has ensured a statistically significantpreserved crop.

The results on the evaluation of herbicides from imidazolinone chemical class by their pre-emergent application in fodder bean crops are stated. In 30 days after treatment in the variants Pulsar, AS (0,75–1,0 l/ha) total weed plants number has decreased for 96,5%, fresh weight for 88,9–94,5%, by herbicide Tapir, AC application (0,5–0,75 g/l – for 96,5–99,5% and for 99,0–99,5%, accordingly. The kept yield in the given variants has made 5,6–7,0 and 6,0–7,3 cwt/ha, accordingly.

As a result of two-year researches it is determined that leaf spot diseases of a mixed etiology – phyllostictous (the disease agent – a fungus Phyllosticta sp.) and alternarious (the disease agent – a fungus Alternaria sp.), the severity of which reaches 28,3–36,8 % at incidence 58,9–66,4 % dominate in black chokeberry. In 2017 the single cases of the crop infection by powdery mildew are marked.
The efficiency of two times fungicides application for black chokeberry leaf spot diseases control has made 44,8–86,5 %.

In the article the results of researches on the efficiency of desiccants Reglon super, AS, Sukhovey, AS, Sprutextra, AS in fodder bean crops are presented. It is revealed that at the cost of the given preparations application the seed moisture has decreased for 2,5–2,1 %, the reliably kept yield has made 1,8–2,0 cwt/ha in comparison with the variant without treatment. The desiccants application did not render the negative influence on fodder bean seeds germination.

The influence of the triazole derivative retardant tebuconazole on the process of growth, morphogenesis, accumulation and redistribution of unstructured carbohydrates (sugars and starch), nitrogen, phosphorus and potassium, connecting with the productivity of sweet pepper crop was studied. It was found out that the formation of the larger leaf surface, optimization of their mesostructure, better supplying of sweet pepper and organs with the elements of mineral nutrition, as well as the increased outflow of unstructured carbohydrates from vegetative organs to fruits influenced by tebuconazole, increased crop yield.

This article introduced the results of the research on the classification structure of the spring rapeseed field. Estimated species composition, abundance and occurrence of beetles in spring rape field. The structure of leaf beetle species obtained will be optimized, and protective measures will be optimized based on the experimental results.

The purpose of the study was to study the peculiarities of seasonal fluctuations in the dynamics of the abundance of natural populations of carnivorous bugs during the entire winter wheat season in the Forest-Steppe of Ukraine for the period 2014–2017. Methods were applied: comparative, analytical, field, statistically-mathematical. The results of observations of long-term seasonal dynamics of the number of beneficial insects – entomophages on winter wheat crops – are obtained. It is determined that their numbers ranged from 1 to 35 copies on culture. On the basis of their own research, it was suggested that monitoring of Afidophages be monitored in time to account for the population size for the purpose of determining EPO.