USEFULNESS OF BIOPREPARATIONS APPLICATION FOR POTATOES AND THEIR EFFECT ON CERTAIN INDICATORS OF SOD-PODZOLIC DRAINED SOIL

Abstract

In a model experiment the effect of a new generation organic fertilizers (multipurpose compost (KMN)) applied at a dose of 15 t / ha and biological products Azotovit and FlorHumate on potato productivity and fertility indicators under different water regimes of drained gleyey light loamy sod-podzolic soil was revealed. The biological product Azotovit application against the background of prolongation of the action of KMN contributed to obtaining the maximum yield among the studied options. On average over three years (2016-2018) the increase in yield on treatment of potato tubers with Azotovit and using KMN was about 9% in relation to KMN.  Application FlorHumate under the experimental conditions were less efficiently. The Florgummat application was less efficient. Under the influence of the studied drugs,  the potatoes development was activated. Microbiological analysis of the soil revealed an increase in the number of nitrogen-transforming and phosphate-mobilizing microorganisms in the variant with the use of KMN compared to the control variant without fertilizers, as well as in the variants with the biological products application as compared with the variant of KMN. The largest number of agronomically beneficial microflora was observed in cases of potato tubers treatment before planting with Azotovit, and to a lesser degree by FlorHumate. For three years of the experiment, the potato yield and the number of agronomically beneficial microflora were in a linear relationship. On average, over three years, the correlation coefficient between these variables was r = 0.89, which characterizes this relationship as strong. The application method of linseed decomposition revealed that the introduction of the microbiological preparation Azotovit against the background of multipurpose compost increases the activity of cellulose-decomposing microorganisms and is 83.0% for a 28-day exposure from the time of potato planting. In KMN variant this indicator was at the level of 65.6%, in the control – 41.6%.