The genealogy of the separate sorts of mild winter of International Breeding Research Laboratory V. N. Remeslo Mironovka Institute of Wheat were analyzed. And sources of forming the sings, providing their high adaptability, were also found . it is shown that the main role in sort productivity, their stabilityto sickness and to unfavourable factors of environment played a starting material of west-european ecotype.

Open seeds - difficult (complex) biological system. The same plants gives seeds with different morphological indication (form, size, dyeing, weight 1000 seeds), anatomical and physiological properties. The physiological properties are correlation, state of quiet, influence on the anatomy construction and chemical composition of seeds lettuce Lactuca sativa L.

Under investigation inflluence period of sowing and presowing processing on productionity seeds of dill.

In the article there are surveyed approaches to the use of biological - ecological potential of white head cabbage plants, given parameters of varieties adaptability and economically-valuable signs variability, depending on a temperature factor, water supply. The yield prognosis is worked out.

The main principles of the forming of the scientifically based variety policy of Ukraine are described. A great role during the creating of varieties and hybrids with certain quantitative and qualitative characteristics belongs to the producers of the cereal and seed production, enterprises of the processing industry, firms, which supply their varieties to the world market.

The Article states forth the ways of post-war reproduction establishment and development, reorganization and activity of the Plant Variety Examination network almost during 80 years of its existence

The sorts different by economic-biologic character of unshed seed, breeded in Ukraine and abroad obtained wide spreading in production. Expediency using lugansky or samarsky type of determinant stability to healthy growth. Breeding sorts with tendril type of leaf give the positive results in increase stability of the plants to damping-off. The sorts combining named recessive character with another aconomic-value traits of grain pea made and suggested to production.

There are analysed cucumber varietal resources and directions of their use. The results of the study of 400 cucumber variety samples of native- and native and foreign breeding under conditions of the open sheltered ground (spring - summer crop rotation) are elucidated. The best ones are revealed, which are characterized by early ripening, productivity, the sign of parthenocarpy.

Наведено результати досліджень з впливу фізичних і хімічних мутагенів на зимостійкість і ураження рослин М2 сортів ярої пшениці, занесених до Державного реєстру сортів України, при сівбі їх восени.

Main directions and results of Research on genetic diversity of maize in China and their practical use in breeding are represented.