Mechanism of new sunflower hybrids reaction on mineral nutrition background and seed planting rates

The results of two-year research of influence of nutrition backgrounds and seed planting rates on sunflower hybrid yield formation. It is established that the highest seed yield of hybrid Oskil has been received at planting rate 50 ths seeds ha-1 with fertilizer application and of hybrid Yason - at planting rate 50 ths seeds ha-1 with fertilizer application and at the planting rate 40 ths seeds ha-1 in the control sowings.