Kravets' I. Changes in Nitrogen Fund and Nitrogen Balance of Podzolic Chernozem in the Right-Bank Forest-Steppe Zone of Ukraine at the Long-Term Usage of Fertilizers in Crop Rotation

The object investigation - nitrogen component of podzolic chernozem fertility and nitrogen nutrition of plants. The aim of investigation - to base ways of optimization of the nitrogen component of the soil fertility and nitrogen nutrition of plants in a field crop rotation. The methods of investigations - field and laboratory methods in combination with looking after plants, mathematic methods of data treatment. The theoretical rusults - processes of formation and optimization of the nitrogen compound of the podzolic chernozem fertility in the field crop rotation are grounded. The practical rezults - recommendations for regulation of soil nitrogen conditions in the field crop rotation are carried out. The novelty - optimal saturation of the field crop rotation by nitrogen in different fertilization systems is based. The rate of introduction - in the field crop rotations of Right-Bank Forest-Steppe