Abstract
The paper covers the study of direct impact and after-effect of 40 t/ha of cattle manure on theorientation of nitrogen fixation and biological denitrification processes in the root zone of potatoes,spring barley, pea, and winter wheat plants in rotation in a stationary field experiments on leachedblack soil. Application of manure had significantly increased the nitrogen fixation activity, whilepromoting a high level of N2O emission. The use of microbial preparations for pre-seeding bacterization of seeds optimizes the course of biological nitrogen transformation process — through theenhancement of nitrogen fixation activity and reduction of gaseous nitrogen losses (with the exception of Biogran use on potatoes in the year of manure application). Introduction with manure of alarge number of microorganisms to the soil offsets the positive effect of biopreparations use. Yieldrecords and estimation of grain output per hectare within the crop rotation cycle indicates the practicability of combined application of manure and microbial preparations (excluding the year of direct effect of organic fertilizer) in organic agriculture.
Highlights
Nowadays we observe an active transition of the Ukrainian agricultural sector towards the sustainable and environmentally safe agriculture, including organic production
The following preparations were used for pre-seeding treatment: Biogran was used for potatoes, Microhumin — for spring barley, Rhizohumin — for pea and Polymyxobacterin — for winter wheat [6]
The study of the potential nitrogen fixation activity in the rhizosphere soil of potato plants indicated the significant increases of indices in variants with pplication of microbial preparation Biogran (Table 1)
Summary
Сільськогосподарська мікробіологія. — 2017. — Вип. 25. — С. 18–24. ISSN 1997-3004. The list of factors that influence crops productivity in organic agriculture is limited due to high legislation requirements on hygienic purity of products. This stipulates the search for agricultural practices that will contribute to the optimization of plant root nutrition and crop production processes. Microbial preparations are a powerful factor of optimization of microorganisms’ composition and biological processes in the soil. In this regard, the objective of the given work is to study the orientation of individual biological processes in agrocenoses under the use of manure and microbial preparations
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