Economic Efficiency and Bioenergetic Assessment of Predecessors and Fertilizer Systems in the Sunflower Cultivation

Sunflower is one of the most profitable crops in Russia. Research was carried out in a multivariate experiment in two 10-course crop rotations with long stationary monitoring. The influence of the crop rotation type and fertilizer doses on sunflower yield and its economic efficiency were studied. The soil is heavy black soil with low humus content arable in layer – 3.90–4.05 %. It was found that it is appropriate and cost-effectively to introduce N under a sunflower, and with sufficient provision of soil mobile phosphates it is possible to apply some nitrogen fertilizer at 40 kg per ha.