The productivity of winter rape depending on nitrogen nutrition and growth regulating fertilizers under climate change conditions

UDC 633.853.494;631.842.4

DOI: 10.31521/2313-092X/2019-1(101)-8

 

Ye. Domaratsky
V. Bazali
O. Domaratsky

 

 

        Global climate changes both in the world and in the regions of Ukraine determine the search for and the introduction into agricultural production of adaptive varieties and hybrids of field crops with simultaneous improvement of technologies of cultivation by means of inclusion into technological scheme of compulsory use of growth-regulating fertilizers. Under the severe weather and climatic conditions such substances can serve as a tool for mitigating the effects of stress from droughts, influence of high temperatures, low humidity and etc.This article presents the results of five-year field research, conducted under the climatic conditions of the Yelanets district of the Mykolaiv region on ordinary black low-humus soils.The goal of research was to determine the productivity of winter rape depending on Nitrogen Nutrition and Growth Regulating Fertilizers under Climate Change Conditions of Steppe Zone in Ukraine.In order to achieve the goal there was conducted the three-factor field research under the scheme: factor A – early spring treatment with Nitrogen Fertilizers (dose N60, N90) without feeding; Factor B –foliar nutrition of winter rape with the complex growth-regulating substance Helafit Combi® twice during the growing season and with Waxal®, in the control variant  the spraying of plants with pure water; factor C – the winter rape variety Black Giant and the Kronos hybrid.The research has proved that the productivity of the hybrid Kronos is higher than of the variety Black Giant by 0,49 t/ha or by 17%.The results of the field research indicated that the yields of winter rape reach the maximum values ​​after the early spring treatment with Nitrogen nutrition (dose N90) in combination with the two-fold foliar application of the growth- regulating substance Helafit Combi®. In the framework of the research the productivity of the Black Giant variety is 2,89 t/ha and of the  hybrid Kronos  is  3,38 t/ha of conditioned seeds. The increase in yield is 0,79 t/ha in the variety and 1,11 t/ha in the hybrid.

 

        Key words: climate, winter rape, yields, foliar application, growth-regulating substances, photosynthetic potential.

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