Consumption of Biogenic Elements by Rice Plants with the Use of Lignohumate

The study was conducted to investigate the effect of pre-sowing seed treatment with lignohumate on the intensity of consumption of biogenic elements by rice plants from soil and fertilizers during their growing season. The studies were carried out in 2023–2024 in the rice irrigation system of the left bank of the Kuban River in Republic of Adygea. The field experiment included a control (without fertilizers), application of NPK fertilizers (background) and variants with the treatment of rice seeds with an aqueous solution of lignohumate at rates of 125, 250, 500, 750, 1000 ml/t against the background of NPK. The highest consumption of nitrogen, phosphorus and potassium by rice plants in the experiment occurred when the seeds were treated with lignohumate at a rate of 750 ml/t. Compared to the control, their assimilation increased by 56,8 %, 58,3 and 63,1 %, and compared to the background – by 16,4 %, 18,6 and 17,6 %, respectively. The average daily intensity of nitrogen, phosphorus and potassium consumption increased compared to the control by 60,8 %, 62,5 and 67,3 % and compared to the background by 18,2 %, 20,6 and 19,6 %, respectively. Optimization of mineral nutrition of rice was accompanied by an increase in the removal of nitrogen by 46,1 %, phosphorus by 47,7 % and potassium by 52,0 % relative to the control and by 10,9 %, 13,2 and 12,0 %, respectively – compared to the background. The utilization rates of nitrogen, phosphorus and potassium by rice plants from fertilizers increased by 30,98 %, 23,04 and 76,04 %, respectively, in relation to the control and by 9,68 %, 8,29 and 23,9 % in relation to the background.