ASSESSMENT OF WINTER WHEAT VARIETIES BY THEIR ASSOCIATIVE NITROGEN FIXATION ABILITY

The paper depicts the results of intervarietal variability study of winter wheat plants in controlled environment with varieties Albatross Odessa, Kiriya, Zolotokolosa, Lybid and Odeska 267 by their associative nitrogen fixation ability. The 5.6 – 13.7 – fold divergence between the varieties by given index was revealed. It was shown that intravarietal variability of winter wheat plants by their ability to stimulate associative nitrogen fixation occurs along with the intervarietal one. Populations intensity of a different genotypes characterized by high nitrogen fixation activity in root zone, stipulates high nitrogen fixation potential of variety. Among the studied varieties Zolotokolosa was selected as genetically homogeneous variety with high nitrogen fixation potential of rhizosphere microorganisms that can be recommended for use in breeding as a source with high capacity for associative nitrogen fixation. New winter wheat varieties with high nitrogen fixation potential can fully develop using not only mineral nitrogen fertilizers, but also interacting with associative nitrogen fixation microorganisms should partially replace mineral nitrogen with biological that, in turn, will guarantee a high yield quality and conservation of agricultural landscapes.

ASSOCIATIVE NITROGEN FIXATION ACTIVATION MEANS IN AGROCENOSIS

The paper overlooks the influence of various agricultural practices on associative nitrogen fixation, including pre-sowing bacterization of seed crops with active strains of associative diazotrophic bacteria, and application of nitrogen fertilizers in physiologically optimal doses in crop production technologies. The authors discuss the relation of process’s activity and plant’s genotype. Due to the biological degradation of the most agricultural soils, and a significant reduction of pool of physiologically active compounds in it, it is appropriate to use growth stimulators in order to intensify associative nitrogen fixation and plant growth.

TECHNOLOGY PECULIARITIES OF NEW BIOLOGICAL PREPARATION MICROHUMIN

The paper covers research data on technology elaboration of new biological preparation Microhumin. It was shown that combination of biologically active biohumus extract with the suspension of active nitrogen fixing strain of azospirills in certain ratio results in creation of preparation performing additive stimulatory effect on growth and development of spring barley plants and activity of associative nitrogen fixation.