The article presents the analysis, in which shows that on required density plant standing, by the time of harvesting crop, is influenced by such factors as the purposes of use of production, the conditions of plant nutrition, availability of the heat and water on the zones of cultivation of hybrids, their early growth, for which, when setting seeding rate the corn necessary make insurance extra charge with subject on laboratory germination of seeds, weight and consistency of grain, the used agrotechnics, including date sowing and depth of seeding, the choice of disinfectant and of tactics of the selected care for crops with the use of agrotechnical and chemical measures of protection, etc.

Amino acid composition and protein content of domestic varieties of spring durum wheat were studied. It was found that an increase in average air temperatures and a decrease in precipitation during the growing season lead to a decrease in protein content by an average of 13,7 %. The limiting amino acids for durum wheat protein are lysine, threonine, methionine + cystine, valine and leucine. Macaroni flour from durum wheat grain was obtained and its quality indicators were determined. It is established that the organoleptic and physico-chemical quality indicators of pasta flour, in addition to ash content, meet the requirements of the current standard. Macaroni products are made and their compliance with quality indicators before and after cooking to requirements of normative documents is established.

The results of studying the effectiveness of herbicides in spring durum wheat crops are presented. It has been established that the Lintour, Meteor and Prima herbicides used in the phase of the tillering of the crop are most effective in annual bipartite type of contamination of crops.

The article presents the results of study on sowing dates and seeding rates influence on field germination and safety of oat plants сv Chernigov 27 and Zhytomyr to improve the elements of the crop growing technology.

Conducted researches has established a high agronomic efficiency of fertilizers for foliar application during cultivation of sugar beet and lupine. Thus, an average of two years of research, the double foliar application of KompleMet PKMg, KompleMet magnesium and KompleMet magnesium (chelate) fertilizers, in the cultivation of sugar beet, contributed to an increase of sugar beet yield by 36–71 centners/ha (9,1–17,9 %), as well as increased the sugar content in the sugar beet roots by 0,6–1,1 %. The double foliar application of KompleMet legumes fertilizer, in the cultivation of lupine, contributed to an increase in seed yield by 4,7 centners/ha (24,7 %), and also contributed to an increase their protein content by 3,6 %.

Under the conditions of small-scale field experiments, the effect of the herbicides Аdengo, SC (thiencarbazone-methyl, 90 g/l + isoxaflutol, 225 g/l + ciprosulfamide (anti-pill), 150 g/l) and MasTer Power, OD (foramsulfuron, 31,5 + iodosulfuron- methyl-sodium, 1 g/l + thiencarbazone-methyl, 10 g/l + ciprosulfamide, 15 g/l) on the contamination of corn. It was established that on average for 2014–2017 years by the time of harvesting the biological efficiency of the applying of Adengo, SC, 0,4 l/ha before crop sprouting and in the phase of 2–3 leaves of corn was 96,2–98,3 %, which made it possible to preserve, as compared with the control without applying herbicides, 51–80 centners per hectare of grain and 250–316 centners per hectare of green mass of corn. The use of MasTer Power, OD at doses of 1,25 and 1,5 l/ha in the phase of 4–5 leaves of maize, on average over the years of its operation, also provided high biological efficacy compared with the control variant without applying herbicides 83,8–95,5 %, which made it possible to save 47–85 centners per hectare of grain and 246–285 centners per hectare of green mass of corn.

 The most actual in protected ground cucumber plantings are such diseases as ascochyta blight (an agent – Ascochyta cucumeris Fautrey & Roum. [teleomorf – Didymella bryoniae (Fuckel) Rehm]) and powdery mildew (an agent – Sphaerotheca fuliginea (Schlechend.:Fr) Pollacci) and Golovinomyces cichoracearum (DC.) VP Heluta), which by absence of modern and qualitative plant protection measures negatively influence the physiological plant development and yield. The assortment of fungicides allowed for application in greenhouses is not enough to control fungal pathogens development and their resistance. In the article the results on the evaluation of the preparation Cydeli Top 140, DK composed of difenoconazole (125 g/l) and cyflufenamide (15 g/l) rendering wide spectrum of action against the protected ground cucumber diseases are presented. Based on 2017 experiments results it is determined that the biological efficiency of the fungicide against ascochyta blight has reached 55,7 % growing the crop during winter–summer crop rotation period and 63,3 % – in summer–autumn. Based on 2018 data, the stem form of the disease development after the preparation application has been 1,8 less in comparison with the variant without treatment and the leaf form – 2 times. The maximum Cydeli Top 140, DK activity has been revealed in relation to mycelium bloom formation and cucumber powdery mildew sporulation. The biological efficiency of the preparation against the disease has made 90,1 % (2017), and by its evaluation on the upper аnd lower surface of plant leaf blade in 2018 this index has made 87,8 and 100 %, accordingly.

The results of studying the biological and economic efficiency of the insecticide Sidopride, FSC (imidacloprid, 600 g/l), herbicides Tavas, SC (diflufenican, 62,5 g/l+ metribuzin, 250 g/l) and Leopard,EC (quizalofop-P-ethyl, 50 g/l) and also the fungicide Bandzho Forte, SC (fluazinam, 200 g/l + dimetomorf, 200 g/l) for potato protection against the noxious organisms are presented. It is determined that the biological efficiency of herbicides in 2 months after their consecutive application on weeds number decrease has made 87,8–99,3 %, the insecticide – 100 % on colorado beetle number decrease and 64,6–82,0 % on tubers damage by wireworms, the fungicide – 95,6–97,5 % on late blight development decrease and 84,6–89,8 % – on alternaria blight development decrease.

The article presents the results of study in 2014–2017 coccinellid parasites on winter wheat in the forest-steppe of Ukraine. The dynamics and abundance levels of parasites Homalotylus flaminius, Oomyzus scaposus (Tetrastichus coccinellae), and Phalacrotophora fasciata are presented during the vegetation period.

Results of the analysis of 16 collection samples of fiber flax of the Russian and Ukrainian origin on use of the index of ecological plasticity (I_sp) are reported. The most perspective samples with the high index of plasticity on productivity of long fiber are allocated.

The article presents the economic-biological and economic characteristics of new zoned varieties of flax-dolgunets – Rubin and Taler. Grade ruby and Taler are characterized by high rates of fiber and seed productivity, resistance to lodging and defeat Fusarium wilt. The profitability of cultivation of Rubin was 45,7 %, which is 16,9 % higher than that of Alej, Taler – 82,6 %, which is 8,4 % higher than that of Mogilev.

The article presents the results of research on the joint application of preharvest treatments and regulated storage conditions to marketable qualities and prevalence of apple fruit diseases, obtained in 2015–2018. The reliable influence of the storage environment and preharvest treatments with biological and chemical preparations on the spread of apple fruit diseases during storage is established. Minimization of fruit losses during storage in conditions with controlled atmosphere is primarily due to significant reduction of losses from infectious diseases of apple fruit.

Individual elements of the technology of growing sweet pepper in greenhouses have been studied. Revealed the best variety samples that provide the highest yield of fruits with high quality products.

The yield of head lettuce and leaf lettuce varieties was studied depending on the methods and dates of sowing. The parameters of adaptive capacity and ecological stability of varieties are determined. During our research, the feedback of genotypes according to the environmental changes was identified, the real productivity and their stability were determined. The response differences to environmental conditions between investigated genotypes established depending on the year of research and sowing dates. The varieties of head lettuce Оrfey, Patritsiy, Valkiriya, Boston and the varieties of leaf lettuce Geyser, Stavr, Svetozar, Gaskon, Dubrava, Mercuriy, which combine the high productivity and ecological stability, are the subject of interest for further plantbreeding work.