Productivity of crops in different crop rotations on typical black earth

Abstract

The purpose. To sum up results of long-term investigation in productivity of crops depending on weather conditions during a year, fertilizing and place in different crop rotations. Methods. General scientific and special: field — for determination of effect of technological provisions on soil characteristics, quantity indicators of productivity of different crop rotations; laboratory — determination of quantitative and qualitative indicators of subjects of inquiry using physical and chemical methods; mathematical-and-statistical — for determination of reliability of the gained results. Results. Dependence of high efficiency of some crops on growing after the best precursors is fixed at keeping normative of crop rotation and length of rotation of experimental crop rotations. Conclusions. In conditions of unreliable moistening of Left-bank Forest-steppe for typical black earth the productivity of crops largely depended on weather conditions of a year, place in different crop rotations (3 – 10-field), fertilizing and optimum structure of sown area. With decrease of length of rotation, especially in simplified 2 – 3-field ones, productivity dropped.