INFLUENCE OF MIXED AND SEPARATE APPLICATION OF BIOHUMUS, ZIRCON AND SILIPLANT ON YIELD AND OIL CONTENT OF SUNFLOWER SEEDS
The data on the joint and separate effects of biohumus, growth regulator Zircon and Siliplant fertilizers on the content of available forms of nitrogen, phosphorus and potassium in the soil are presented. At the beginning of the growing season with the introduction of biohumus (8 t/ha) the maximum nitrogen content of 39.9 mg/kg, phosphorus 167 and potassium 197 mg/kg was established. When spraying plants with Zircon the amount of nitrogen at the beginning of the growing season decreased by 14% with Siliplant by 8%; at the end of the growing season by 19 and 15% relative to the control; phosphorus at the beginning decreased by 5 and 9%, at the end 8 and 10%, respectively; potassium at the beginning decreased by 6 and 9%, at the end by 6 and 10%. The decrease in the content of macronutrients in the soil indicates their consumption by plants. The introduction of biohumus and spraying of plants Zircon and Siliplant contributed to the growth of yield and oil content of seeds. The maximum increase in seed collection by 7.4 centners per hectare was obtained with double treatment of plants with zircon. The least effect is obtained from the introduction of one biohumus. With the complex use of biohumus and mixture (Zircon + Siliplant), the yield increase amounted to 6.1 centners per hectare, and the oil content of seeds increased from 37.8 to 40.3%.