WAYS TO INCREASE THE EFFICIENCY OF LONG-TERM APPLICATION OF DIFFERENT FERTILIZER SYSTEMS IN SHORT-TERM CROP ROTATION

Abstract

Objective. To evaluate the influence of different fertilizer systems in combination with microbial preparations on the change of nutritional regime of sod-podzolic soil and the yield of crops of short-term crop rotation in the Polissia region. Methods. Fields — stationary experiment, laboratory, mathematical and statistical. Results. On the basis of studies conducted in a long-term stationary experiment on sod-podzolic soil, analysis and determination of dependence between the content of available compounds of nitrogen, phosphorus, potassium on fertilizer systems and microbial preparations was performed. It was found that the highest nutrient reserves in the soil were in the organo-mineral fertilizer system “manure + green manure + NPK” in combination with microbial preparations: the content of mineral compounds of nitrogen — 82.32 kg/ha, available phosphorus — 223 mg/kg of soil, and exchangeable potassium — 122 mg/kg, which is 1.8, 1.4 and 1.6 times higher than the parameter of the mineral fertilizer system, respectively. At the same time, due to the inoculation of seeds nitrogen reserves in the soil can increase up to 26 %. The application of the fertilizer system “manure + green manure + NPK” provides an optimal level of root nutrition of crops of short-term crop rotation and, as a consequence, the highest productivity of crops, which amounted to: winter rye — 5.2 FU (fodder units), potatoes — 7.7 FU, oats — 3.3, lupine — 3.8 FU on background without inoculation and 5.7, 8.3, 3.9 and 4.4 FU, respectively, when microbial preparations were applied. The increase due to inoculation with this fertilizer system amounted to 0.5 fodder units (FU) for winter rye, 0.5 FU for potatoes, and 0.6 FU for oats, and 0.6 FU for lupine. Conclusion. The nutrient regime of sod-podzolic soil depends on the use of various fertilizer systems in combination with microbial preparations. Organic-mineral fertilizer system “manure + green manure + NPK” under the use of microbial preparations is most effective for growing crops on sod-podzolic soil in short-term crop rotation. This combined fertilizer system contributes to the greatest accumulation of nutrient reserves: nitrogen mineral compounds — 82.3 kg/ha, available phosphorus — 220 mg/kg of soil and exchangeable potassium — 122 mg/kg.