The article presents the results of studies on the use of new methods of intensifying the cultivation of flax, affecting the yield and quality of flax fiber. It was established that the use of chelate forms of zinc and boron, as well as the fungicide Amistar extra, increased the yield by 2,2 centners per hectare on average, and with additional processing of crops by Ecosil forte, the yield of total fiber was higher by 2,7 c/ha or 18,1 %. The use of the studied drugs in the cultivation of flax significantly increases not only the yield of the total, but also the long fiber by 1,5–1,6 c/ha or 13,5–14,4 %.

This paper presents the results of study of influence of physiologically active substances and complex preparations on development of yield of durum winter wheat, Kontinent cultivar, under conditions of North Ukrainian Steppe. The data of degree of influence of specified preparations on growth, development and wintering of plants and yield of durum winter wheat are given. According to results of four-year field researches the conclusions on yield of durum winter wheat were drawn depending on administration of preparations and mineral status, as well as their efficiency and applicability.

To identify the species composition of phytopathogenic mycoflora on winter barley, the development and incidents of crop diseases was monitored in various agro climatic zones of the Republic of Belarus. Selected samples of the plant material with disease signs were subjected to molecular genetic analysis for species identification by means of comparing the obtained sequences with the contributors of the Genbank database.

It is established that the samples presented had mainly a polyinfected character of damage. As a result of dominant micro flora sequencing 11 species were identified.

In root fiber Microdochium sp., Leptodontidium sp., Fusarium oxysporum, Microdochium bolleyi were found. The leaves were infected with four phytopathogenic types: Puccinia hordei, Blumeria graminis, Rhynchosporium secalis, Pyrenophora teres f. maculata. On the ear were noticed: Rhynchosporium secalis, Cladosporium herbarum, Alternaria infectoria. Uncommon types of pathogenic fungi for the conditions of Belarus Pyrenophora teres f. maculata и Microdochium bolleyi were identified.

In the course of research, it is determined that the complex of protective measures carried out during the growing season has improved the phytosanitary condition of both potato plantings and tubers. The biological effectiveness of the fungicidal protection of the crop against late blight has made 60,6 %, rhizoctoniose on the underground part of the plants – 61,3 % and on the stolons – 75,8 %. It is revealed that during harvesting, the incidence of mixed rot on tubers has decreased about 0,3 %, the rhizoctoniose development – for 47,5 % , elaters damage – for 77,3 %. The preserved yield has made 193,0 cwt/ha of tubers.

In the article the results of biological and economic efficacy of Rayok, EC fungicide (difenoconazole, 250 g/l) with 0,2 l/ha rate against highbush blueberry stem diseases are presented. In the highbush plantations the biological efficacy of Rayok, EC fungicide has made 80,9 % (phomopsis twig blight) – 83,1 % (fusicoccum canker). Conducted protective measures have allowed to save 54,0 cwt/ha of blueberries crop in comparison to the control.

A comparative evaluation of biological efficiency of different chemical origin preparations - Biomite, SC and Voliam Targo, CS in the restriction of common spider mite (Tetranychus urticae Koch.) number is done. A high biological efficiency (at the level of 100%) in the control of the phytophage number as a result of three times preparation Biomite,SC application at the rate of 0,5 l/ha is determined. The highest biological efficiency of Voliam Targo, CS as a result of two times application has made 68,2 % and 80,4 % depending on the vegetative period of the growing crop. Based on the obtained data it is recommended to introduce the preparation Biomite, SC at the rate of application 0,5 l/ha into the phytosanitary technology of cucumber plantings protection under conditions of studied greenhouse agrobiocenosis against common spider mite (not less than two times treatment) for preventing the processes of resistant populations formation to avermectin-containing pesticides.

The quality of the cultivated and produced products is always actual. In ordеr to get a high quality yield, it is necessary to proteсt maize against noxious organisms.

The use of herbicides for the purpose of controlling weed vegetation should be economically feasible, justified and not affect the quality. It is determined that the herbicides used against annual and perennial weeds do not render the negative еffeсt on maize quality and yield.

This article presents information about irrigation methods and modes for plantations of a given crop based on practical experience in cultivating highbush blueberries, as well as analysis of literary sources. The soil in the stalk of the blueberry should be constantly wet. Different methods of are used for this culture: flooding, sprinkling, regulation of groundwater levels, drip irrigation. The choice of the appropriate method and mode of water supply for plantations of blueberry is determined for specific conditions based on the amount of precipitation, the particle size distribution of the soil, the level of groundwater, the type of mulching material, the terrain, etc.

The article presents the results of studying the action of herbicides and methods of tillage in the links of vegetable-fodder crop rotation on the contamination of crops and the yield of vegetable crops.

The results of the research of the head lettuce varieties when grown in the conditions of the right-bank forest-steppe of Ukraine are presented. The features of the onset and passage of the phenological phases of plant development are established. Biometric parameters of plants were determined during the period of planting of seedlings in open ground, in the phase of the beginning of the formation of the rosette of leaves and in the period of harvesting. The yield of varieties of lettuce in the open field has been determined.