Influence of pre-sowing seed treatments with biologically active substances on spring wheat rhizosphere microbiocenosis
DOI:
https://doi.org/10.15587/2519-8025.2019.158380Keywords:
Triticum aestivum, wheat, microbiocenocis, microorganisms, catalase, nanoparticles, nitrogen-fixers, actinomycetes, micromycetesAbstract
Aim of research. To evaluate changes in the spring wheat rhizosphere microbiocenosis at the pre-sowing treatment by citrates of biogenic metals, created based on nanotechnologies and inoculation of the consortium of root microorganisms in soil at the effect of these arrangements on the enzymatic activity of leaf tissues and productivity of wheat plants.
Methods. Microbiological methods – inoculation on solid nutritive mediums for determining the content of main groups of soil microorganisms in the rhizosphere of plants; biochemical – for determining the activity of antioxidant enzymes of catalase and peroxidase; biometric – for determining the mass of 1000 seeds and seed productivity on experimental areas; statistical.
Results of research. Field experiments of crops of spring wheat Pecheryanka demonstrate that at the pre-sowing treatment of seeds by 1%-solutions of biologically active substances in the content of composite fields of citrates of nanoparticles of Ag+Cu and Co+Cu+Zn+Fe+Mn+Mo+Mg (Avatar-1) and ions I-Se and introduction of the consortium of soil-useful microorganisms (biopreparation BP Extrakon), there were observed changes of ratios of main microbial groups in the composition of soil microbiocenocis: aerobic nitrogen-fixers, actinomycetes, fungal microflora, oligotrophic bacteria, that in some way correlated with the seed productivity.
Conclusions. 1. It has been established, that the ratio of microbial groups, especially the percent of groups of aerobic nitrogen-fixers increased in the wheat rhizosphere relating to the control in the following succession – in the earing phase: BP Extrakon˃Extrakon+I-Se, and in the milk ripeness phase – in the following succession: BP Extrakon+I-Se˃BP Extrakon˃Avatar-1˃Ag-Cu. Actinomycetes prevailed on the variant with the pre-sowing treatment by I-Se, and the fungal microflora – in the milk ripeness phase.
2. The activity of catalase ad peroxidase in leaf tissues at the pre-sowing treatment by biologically active substances was lower than in the control, except the variant of the pre-sowing treatment by citrates of nanoparticles of Ag-Cu, where the catalase activity a bit grew – by 7.9%.
3. It has been revealed, that indicators of the seed productivity improved most essentially at inoculation of the consortium of root microorganisms in soil, and also at the treatment that favored the increase of aerobic nitrogen-fixers in the soil rhizosphere, thus the seed productivity increased on the variants in the succession: BP Extrakon˃BP Extrakon+I-Se˃Avatar-1˃Ag+Cu, decreasing at the variant with the treatment by I-Se
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