Kolibabchuk T. Productivity of crops of the courses of cereal-beet rotation depending on fertilization systems in the forest-steppe one of Ukraine.

A thesis for receiving the scientific degree of a Candidate of agricultural sci-ences in speciality 06.01.09 - Plant growing. - The Institute for Sugar Beet of UAAS, Kyiv, 2006. Under conditions of insecure moistening of the forest - steppe zone of Ukraine, elements of growing crops of the course of cereal - beet rotation were perfected by the use of optimal systems of application of organic and mineral fertil-izers and the use of by-products of plant growing. Optimal rates of fertilizers give better provision of plants with nutrient ele-ments and reduce inputs of soil moisture per yield unit. Root yields and sugar yield with application of the rates of N120P50K140 of mineral fertilizers under basic soil cultivation have increased, as compared with the control variant, by 11.2 t/ha and 1.83 t/ha, respectively. Better technological quali-ties of sugar beet roots were found in the same variant and with organic mineral system with the quantity, of mineral fertilizers reduced twice. The highest yields of main product and by - product of winter wheat were obtained in the variant of full mineral fertilizer combined with residual effects of organic fertilizers, applied under preceding grain maize; on the background of re-sidual effects of organic fertilizers, the use of twice reduced rates of mineral fertil-izers (N30P25K30) proved efficient. Average yields of grain of spring barley of 4.7 t/ha can be obtained with application for winter wheat and sugar beet of mineral fertilizers and the use on their background of residual effects of byproducts of pre-ceding crops. Coefficients of energetic efficiency of fertilizer across the best variants amount from 1.6 to 1.83. Key words: winter wheat, sugar beet, spring barley, technology of growing, systems of fertilization.