Sergienko O. The improved method of getting cucumber hybrid seeds and raising its seed productivity under conditions of the open ground.

Object: hybrid seed growing of cucumber. Aim: to improve metods for getting hybrid seeds of cucumber with 90-100% hybridity level for conditions of the open ground. Methods: field laboratory ones. Novelty: the is determined and scientifically substantiated the possibility of getting seed from heterotic hybrids on the basis of selective fertilization, the methods for maintenance of large part of female plants and plants of female type in maternal form is worked out; it is deter-mined that plants of female type of flowering are genetically nearer to plants of intermediate type, than to female ones; there is shown the positive effect of new growth regulating preparations. Results: for hybrid seed-growing of cucumber in the open ground there are worked high-effective (profitableness is 257-350%) ways for getting seeds with the hybridity level about 94-97%, during free pollination with the exception of cleaning by sex, they are improved, experimentally confirmed and widely introduced in production; there are distinguished growth regulation substances (GRS) which ensure the increase of seed yield at 20-40%. Introduction extent: it is introduced in agricultural enterprises of different forms of property in Kharkiv region. Field of use: vegetable growing, seed growing.