The research results of seed yield, protein content, amino acid composition and biological value of green beans of Irishka, Dubrovenskaya and Chyzhovenka varieties were presented.
The content of essential amino acids in the seeds of green bean of the Irishka variety was 70.8 g/kg of grain, the Dubrovenskaya variety – 72.0 g/kg, the Chyzhovenka variety – 71.1 g/kg with the content of essential amino acids in the protein of the studied varieties – 316.0, 321.4 and 321.8 mg/g of protein, respectively.
The protein of green beans of the Irishka, Dubrovenskaya and Chyzhovenka varieties conformed to the recommended standards of FAO/WHO on the content of essential amino acids (99.4–101.3 %).

The research results in 2013–2015 RUE «The Institute of Vegetable Growing» (Belarus) on the effect of planting density on yield and sowing leek (Allium porrum L.) of different maturity groups are presented in the article. It was found that growing early varieties seedling method on sod-podzol sandy loam soil the highest yield of marketable products (58.6 t/ha) was obtained using a planting scheme 70´10 cm (142.9 thousand plants/ha) and nonseedlings (39.0 t/ha) under the scheme 70´6 cm (238.1 thousand plants/ha). For mid- and late-ripening varieties optimal density is 142.9 thousand plants/ha (70´10 cm) in the seedling culture, and in nonseedlings – 178.6 thousand plants/ha (70´8 cm). The marketability of products over the years of the experiments was 97.1–98.4 %.

The morphometric signs of tomato varieties seedlings depending on the sowing time and growing methods are presented in the article. The influence of the studied agrotechnical methods on yield and fruit quality is given.

The research results regarding the influence of sowing time effect on the morphometric parameters of seed plants and breed-sheds are presented, biochemical and fractional composition of rosette plants, productivity and sowing seed qualities are given.

Ozonization efficiency and the increase of potato tubers saleable quality in the potato warehouse in a case of long term storage are determined.

The analysis and economic efficiency assessment of modernization of greenhouses of the Institute of Vegetable Growing was made. It is established that the cost of the project will be repaid by the increase in the number of produced seeds of vegetable crops. It will provide import substitution of 2.0 million dollars USA. The planned payback period of the project is 3 years.

The research results of improvement technology in two varieties of potato three-factor experience are studied in the article

The source material for selection of heterotic hybrids of moschatous (Cucurbita moschata Duch. ex Poir) and large-fruited pumpkin (Сucurbita maxima Duch.) for increased content of carotene and pectin in fruit flesh was identified and created. High-carotene and high-pectin lines are distinguished by selection methods. In the system of top crosses, promising hybrid combinations with a high content of biologically active substances were created. Parental forms have been evaluated as maternal and paternal components of hybrids.

The results of the morphology evaluation of spring garlic clones are presented in the article. The suitability assessing of samples to growing conditions is given.

The research results in plastic foil houses of 85 new varieties and hybrids of bell pepper (Capsicum annuum L.) in 2016–2017 are presented in the article. The data on the number of varieties characteristics is given in the article. Donors of valuable signs for further use in breeding are allocated.

Downy mildew (peronosporosis) affects cucumber, watermelon, melon and C. maxima species of pumpkin. Plants of zucchini and patisson are not affected by P. cubensis.
The population of P. cubensis is heterogenic and consists of two pathogens. Patotype 1 is compatible with cucumber species C. sativus, watermelon species C. vulgaris and melon C. melo. Patotype 2 is compatible with pumpkin species C. maxima, cucumber species C. sativus, watermelon species C. vulgaris and melon C. melo.

Differentiation races of C. fulvum in the Republic of Belarus on differentiator-varieties for 2013–2016 indicate that its population consists of simple and complex races. In C. fulvum 2016 the population consisted of 6 races (2, 1.2, 1.9, 1.2.3, 1.(2).3.4, 1.(2).3.4.9), containing 1–4 (Cf₀, Cf₁ Cf₂, Cf₄, Cf₉ ) virulence genes. PCR diagnostics identified race 1.(2).3.4.9 and 1.(2).3.4, which make up 20–34 % of isolates.

The plant damage of tomato and cucumber by the Tobacсо mosaik virus and Cucumber mosaic virus is noted. The infectness samples of tomato by the Tobacсо mosaik virus is reached on culture of tomato 27.2 %, on culture of cucumber – 9.1 % . The latent infection of Cucumber mosaic virus had 18.2 % samples of tomato and 9.1 % samples of cucumber.

The assessment results of 15 samples of red beet in the conditions of Belarus are introduced. The samples for the further breeding are marked.

The polymorphism of androsterility flowers in the collection of garden carrot varieties and hybrids is shown. Families with the largest fraction of standard roots were selected from self-compatible male fertile Lyavonikha plants offspring. The best families of the first generation offsprings free pollinated petaloid- or braun male sterile cytoplasm are isolated from the Lyavonikha variety.

The polymorphism of androsterility plants in varieties collection and hybrids of onion flower phenotypes is shown. According to the maximum number of seeds set from the varieties Vetraz and Edelweiss, self-compatible male fertile plants are isolated. The sources of the initial plants of sterile testers were varieties Vetraz, Skarb litvinov and hybrid Arenal F₁. The high potential of S-testers for seed set in free pollination is revealed in the hybrid Red Chapelin F₁.

The research results of the studies of selfed melon lines on productive index are presented. The influence degree of inbreeding and genotype generation on the formation of valuable-commercial quantitative traits (productivity, average fruit weight) are analyzed.

It was established that Arnica montana under cultivating conditions formed seeds with morphometric indiхes close to wild plants. Their germination ranged from 30 to 73 % and differed by years. Preliminary treatment of seeds with the Effect-2 complex fertilizer in combination with cold stimulation increases the seed germination by 1.6 times.

The winter hardiness degree of 16 varieties of leek is established, the most winter-hardy varieties which can be used not only in the conditions of Non- Black Earth Region but also for cultivation in the conditions of risky agriculture are allocated. The characteristic of the main morphological, economic and useful features of leek is given. Biochemical indexes of young, valuable plants of leek for use entirely in food are shown.

The two-year studies on the effect of growth stimulants and humic preparations in combination with macro- and microelements on the viability and energy of seed germination of edible roots are pesented in the article. The best preparations on a humic basis allowing increasing germination and germination energy of seeds are determined.

The parameters of electricity and heat energy consumption per unit of output in winter greenhouses when tomato and cucumber plants are grown on mineral wool are presented in the article.

The results of the original material evaluation of hard rind pumpkin of different geographical origin for breeding of domestic varieties high seed productivity and complex of the other economic-biological signs are published in the article.

The constructive and technological features of modern glass greenhouses of the fifth generation of semi-closed type were showed in the article. Semiclosed greenhouses provide high yield with less material resources. Building block concepts new greenhouses up to 7 hectares in place existing greenhouses are presented.

The condition of medicinal crops production in the Republic of Belarus is considered in the article. The role of simples in pharmaceutical industry in present time is opened in the article. The analysis of state programs was carried out in which the attention was paid to medicinal crop production. The development tendencies of medicinal crop production in the Republic of Belarus are planned.

As a result of the carried researches in 2013–2016, viability and authenticity of 1157 samples of root green crops was supported. Two hundred fifty samples of carrot, beetroot and radish were studied for various economically valuable traits in field and laboratory conditions. As a result, 65 sources of economically valuable characters for breeding were allocated. It was established that the varieties, which were highlighted for yield and marketability of root crops, were distinguished by a small-cell structure of the leaf epidermis and a large quantity of the stomata per unit of leaf area. It was assumed that each of the above-mentioned features of leaf morphology could be the indicators of high adaptive ability.