The productivity of spring wheat and the content of certain groups of microorganisms in the soil depend on nanopreparations

Relevance . An important factor in reducing the dependence of crop productivity on various limiting factors is the use of fertilizers and biological products, which include nano-preparations. The work studied the effect of nano-preparations on the productivity of spring wheat and individual microbiological indicators of sod-podzolic light loamy soil when regulating the water-air regime. Methods . The research was carried out at the Gubino agro-testing site (Tver region) on soddy-podzolic light loamy drained soil. When the humidity in the 0–50 cm layer decreased below 70% of the PPV, the water regime was regulated by irrigation. Nanopreparations fulvohumate “Ivan Ovsinsky” and n-BoGum were used by spraying spring wheat plants of the Irgina variety. Nanopreparations were studied both separately and against the background of organic fertilizer — multi-purpose compost at a dose of 10 t/ha. Determination of individual groups of microorganisms in the soil was carried out using generally accepted methods in microbiology. Results . During the three-year experiment, a significant increase (significance of differences p < 0.05) in the yield of spring wheat was obtained in the variants with nanopreparations relative to the control. Their use against the background of multi-purpose compost when regulating the water-air regime gave the highest wheat productivity in all years of research. The effect of both nanopreparations was almost the same. The yield increase from nanopreparations relative to multi-purpose compost over an average of three years was 18–20% for irrigation and 11–13% for non-irrigation options and amounted to 3.58 t/ha and 2.83 t/ha respectively. When regulating the water regime, the content of ammonifying and phosphate-mobilizing microorganisms increased, associated with optimal hydration for their vital functions. This was especially evident during the dry period, when irrigation was carried out. The largest number of studied microorganisms was observed in the variants of multi-purpose compost + nanopreparations and with the addition of only multi-purpose compost. At the same time, a high connection with productivity was noted.