Black soil fertility as affected by for long-term fertilization in different crop rotations

Abstract

For typical leached black soil it was proved that introduction of 7,5 t/ha manure + N P K in the first three rotations, 8.3 t/ha manure + N P K in the fourth rotation, and 16.6 t/ha manure + N P K in the first link of the fifth rotation led to an increase in the content of mobile phosphorus in the ploughed soil layer to 270-325 mg/kg, exchangeable potassium to 95-105 mg/kg, whereas at the beginning of the experiment, the content of mobile phosphorus was 144-150 mg/kg and exchangeable potassium 66-71 mg/kg. Content of alkali hydrolysed nitrogen in soil was stabilized against the background of organic and mineral fertilization at the level of 140-124 mg/kg, whereas without fertilizers it was 112-105 mg/kg soil and at the beginning of the experiment 177-173 mg/kg of soil.