Abstract
The paper presents the results of lyzimetric and field studies on the impact of microbial preparations Microhumin and Polymyxobacteryn combined with mineral fertilizers on the productivity of sugar sorghum in Polissya region. It was shown that the pre-sowing seeds bacterization had increase crops yields by 5 – 9% and increased output of ethanol by 0.3 t/ha. Application of biological preparations had ensured less reduction of water-soluble humic substances by 28 – 32%, nitrogen (nitrate) – by 11 – 15%, calcium – by 7%, magnesium – by 8 – 15%.
Highlights
For sugar sorghum plants infiltration was higher relatively to the fallow grasses by 15.2 – 7.7 mm and lower by 10.6 – 3.1 mm comparing to the black fallow
Nutrients were washed with the moisture beyond the root layer of sugar sorghum plant (Table 2)
It was shown that biological preparations had ensured reduction of humic substances losses on 28 – 32%, 11 – 15% of nitrates, calcium – 7%, magnesium – 8 – 15%, which indicates the feasibility of decreasing at the sod-podzolic type of soils the dose of active ingredient of nitrogen and phosphate fertilizers (20 – 30 kg/ha) under the application of biological preparations
Summary
The studies were performed in stationary lyzimetric conditions and in field experiments in the Institute of Agricultural Microbiology and agroindustrial production NAAS during 2011 – 2013. Area of lyzimeter cells is 3.8 m2, area of field plots – 40 m2. Lysimeter experiments were performed on sod-podzolic sandy loam soils with the following agrochemical characteristics of the arable layer: humus (by Tyurin) – 1.1%, pH 5.0, hydrolytic acidity (by Kappen) – 2.5 mEq. 100 g, P2O5 content (by Kirsanov) – 17.0 mg per 100 g, K2O (by Maslov) – 6.2 mg per 100 g soil. Reduction of mineral nitrogen does was performed in variant with Microhumin (from 90 to 70 kg/ha). Agrochemical soil analysis was performed using Peterburskiy A.V. methods [8]. Harvest accounting method – continuous per each plot, experimental data was processed using the variance analysis method [10]
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