The effect of complex pre-sowing treatment of soybean seeds in Primorsky Krai on yield, soil microflora and humus accumulation processes

Abstract

The results of the first stage of the study of the aftereffect of the combined use of the pre-sowing treatment of soybean seeds with an insectofungicidal preparation (Standac Top) with an inoculant (HiCoat Super Soy) and Potassium humate in the conditions of the forest-s teppe zone of Primorsky Krai on the physico- chemical parameters and microflora of agrotemnohumus podbelov are presented. In all the studied variants of the experiment with pre-sowing treatment of soybean seeds, a decrease in the humus content was found, compared with the control, caused by an increase in the processes of mineralization of organic matter by microflora and an increase in the process of removal of nutrients from the plant mass. An increase in enzymatic (catalase) activity was recorded, which indicated an increase in the biological activity of soils as a whole. A close inverse correlation was established between the humus content and the parameters of catalase activity (r = – 0.86). For option 5 (Potassium humate + HiCoat Super Soy), the most significant changes in the composition of the soil microflora were revealed, compared with the control. In this variant, there was a significant increase in the number of fungi, oligonitrophils and soil biogenicity in general, which contributed to a significant increase in the process of transformation of organic matter and destruction of nitrogenous humus compounds. The greatest amount of nodule formation was recorded during the flowering phase and the beginning of bean formation on the variants of Standac Top + Potassium humate + HiCoat Super Soy. The most positive aftereffect on soybean yield was provided by the use of drugs during pre-sowing seed treatment with Potassium humate and Standact top and Potassium Humate + HiCoat Super Soy. There was a positive trend in the increase in soybean yield compared to the control on the variants: Potassium humate + HiCoat Super Soy and Standac Top + Potassium humate + HiCoat Super Soy.