This study examined the effect of presowing seed treatment with lignohumate on the intensity of biogenic element uptake by rice plants from soil and fertilizers during the growing season. We conducted the research in 2023–2024 on a rice irrigation system located on the left bank of the Kuban River in the Republic of Adygea. The field experiment included a no-fertilizer control, an N120P50K60 fertilization background, and presowing treatment of rice seeds on this background with an aqueous lignohumate solution at rates of 125, 250, 500, 750, and 1000 mL/t. Rice plants showed the highest uptake of nitrogen, phosphorus, and potassium when seeds received lignohumate at 750 mL/t. Relative to the control, nutrient uptake in this treatment increased by 56.8, 58.3, and 63.1%, respectively, and relative to the fertilization background by 16.4, 18.6, and 17.6%. The average daily uptake intensity increased, compared with the control, by 60.8% for nitrogen, 62.5% for phosphorus, and 67.3% for potassium, and compared with the background by 18.2, 20.6, and 19.6%, respectively. Optimization of mineral nutrition through seed treatment with lignohumate at 750 mL/t increased nutrient removal with yield relative to the control by 46.1% for nitrogen, 47.7% for phosphorus, and 52.0% for potassium, and relative to the background by 10.9, 13.2, and 12.0%, respectively. The coefficient of fertilizer nutrient use by rice plants increased relative to the control by 30.98% for nitrogen, 23.04% for phosphorus, and 76.04% for potassium, and relative to the background by 9.68, 8.29, and 23.9%, respectively.
Sheudzhen et al. (Mon,) studied this question.