Results of researches of complex influence of the predecessor, ways of the basic soil tillage and fertilizer systems, growth regulators on winter oil rape seed productivity in a link of fodder crop rotation cultivated on the antropogen-transformed peat soils of Polesye are presented. It is revealed that on the background of aftereffect of green manure in a kind of intermediate cultures of a radish olive, superficial disking and application balanced on removal with harvest fertilizer doses, entering in top dressing copper and boron, ekosil or humate productivity the obtaining of winter oil rape seed on the level of 45 c/ha and profit to 600 $/ha that accordingly on 17 % and 2,2 times above base technology and cost lowering on 30 % is provided.

   The impact of the use of mulching and irrigation system elements like soil maintenance on the economic efficiency of cultivation of black currants. Options for using irrigation were more profitable than free options using it. The most profitable options were the simultaneous use of irrigation and mulching Fibres (estimated profit at the end of the project 504,1 thousand. UAH.). It should be noted that even the use of irrigation without mulch increases the profitability of the project. The study found that the most cost-effective mulchyuyuchym material was agrofibre (average profitability of irrigation in versions 85,7 % without irrigation – 47,4 %).

   The results of evaluating the effectiveness of the use of fungicides in crops of millet cultivated for grain in order to reduce the development of melanosis. The degree of damage depends on the grain melanosis morphological and biological characteristics of the variety and growing conditions.

   In the article the results of researches on determining the thresholds of harmfulness of annual grass weeds in spring triticale crops are presented. It is determined that the biological threshold of halmfulness of barnyard grass has made 35–40 pcs/m², wild oats – 17–18,5 pcs/m².

   The results of researches on the efficiency of split fungicides application in controlled phytotrone-greenhouse complex based on spring wheat cv Rostan example are stated in the article. The foreign experience in the given direction is analyzed, the advantages of differentiated approach in relation to application rates are shown, time of preparations application depending on the disease severity and agents species are shown.

   During 2012–2016 there were examined peculiarities and dynamics of development of fungal diseases on winter spelt leaves, namely powdery mildew, brown leaf rust and Septoria leaf blotch. It was shown that Septoria leaf blotch and powdery mildew have a dominant role in the pathogenic complex as their relative shares are 52 and 36 % respectively. It was found that the spread and development of the diseases of spelt depended on weather conditions of the year, whereas May and June were characterized by the most favorable conditions for the pathogens. It was noted that the dynamics of development of the diseases are a condition necessary to determine reasonability, optimal terms and amount of plant protection products.

   Based on the results of done researches it is shown that the herbicide Terrsan, WDG (sulfometuron-methyl acid, 750 g/kg) application at the rate of 0,2–0,4 kg/ha considerably decreases the number and weight of cow parsnip (Heracleum Sosnowskyi Manden.) in 30 days after treatment for 62,2–81,6 % by number and for 89,1–95,6 % by weight; in 60 days – the plant dies fully. The maximum efficiency is reached while carrying out spraying before plants growing up or at their height of 20–30 cm (98,8–100 % kill), by application at cow parsnip (Heracleum Sosnowskyi Manden.) height 60–80 cm the efficiency is decreased up to 77,9 % by number and 97,4 % by weight. By the herbicide Terrsan, WDG application also the other plant components of phytocoenosis are dead.

   The article presents the results of breeding of fiber flax. It shows the economic and biological characteristics of varieties of flax breeding RUE "Institute of Flax". Identified problems in the selection for the near future.

   In article results of long-term purposeful selection work on long-fibred flax on RUE “Mogilev Regional Agricultural Experiment Station of the Belarusian National Academy of Science” are stated. The characteristic of the zoned and perspective grades of long-fibred flax of various groups of ripeness is this, their benefits and potential opportunities on productivity and quality of fiber, resistance to drowning and diseases are noted.

   Studied the responsiveness of new cultivars of flax to changing environmental conditions. Responsive to changes in the environment over the period 2013–2015 were varieties of Vesta, Aley, Grant, Mogilev, Vasiljok, Alize, Suzanne, Drakar. The characteristics of the studied varieties on the yield of flax.

   Presented by the species composition of viruses that infect plants are the following vegetables: tomato, sweet pepper, cucumber, cabbage, onion, garlic, pea, bean, dining carrots и рresented the results of immunoassay accessions of vegetable crops for the presence of latent viral infections.

   The article presents the results of studies of use of herbicides Cardinal 500 SC, Butizan Star SC, Stomp, 33 % EC, Teridoх, ES and desiccant Reglon Super BP at daikon seed crops cultivated in the annual culture. Biological and economic efficiency of herbicides and dessicant and their impact on morphometric parameters and seed sowing qualities are defined.

   It has been established the effect of cucumber seedlings on the yield of its varieties. It has been states that the using of different age of cucumbers seedling affected by the biometrics measures, leaf area and yield. The biggest crops have varieties of cucumber Lyalyuk and Northerner obtained when survival of cucumber seedlings in the phase of one sheet. In addition to maximum productivity, it has been marked the high marketability of fruits.