ОЦЕНКА БИОЛОГИЧЕСКОЙ АКТИВНОСТИ РИЗОСФЕРЫ SORGHUM BICOLOR (L.) MOENCH ПОД ВЛИЯНИЕМ МИКРОБНЫХ ПРЕПАРАТОВ В УСЛОВИЯХ ПРЯМОГО ПОСЕВА В СТЕПНОЙ ЗОНЕ КРЫМА

Abstract

In steppe plants regularly lack of moisture and it affects the biochemical functions of their development. The aim of this research was to study the enzymatic activity of the Sorghum bicolor (L.) Moench rhizosphere grown by no-till technology under the influence of introduced microorganisms under conditions of moisture deficit. The growing season of Sorghum bicolor during the research period (2018–2020) was characterized by high temperature and arid conditions. The lack of precipitation reached 68.5 % in comparison with the average long-term indicators. It was revealed that the influence of the weather conditions of the year and the complex of microbial preparations (CMP) on the changes in the enzymatic activity of the S. bicolor rhizosphere was at the level of p≤0.05. IIBS (integral indicator of biological state) was calculated based on the level of activity of various enzymes in the soil. The value of IIBS with CMP is close to 80 %. It shows that no-till farming using CMP contributes to physiological stability of the rhizosphere. At the same time, the IBPS annually decreased by 61.1–92.8 % in the control variant without pre-sowing treatment of seeds with CMP, which indicates a slowdown of biological processes. The results of the studies proved that the adaptation of sorghum plants to the effects of abiotic environmental conditions is carried out by regulating the enzymatic activity of the rhizosphere by introducing microorganisms. Consequently, the use of microbial preparations is advisable for the cultivation of S. bicolor by no-till technology in steppe zone of Crimea.