State of humus and nutrition of leached chernozem under the effect of fertilisation and field of crop rotation

Purpose. To study the state of humus and content mobile phosphorus potassium in leached chernozem as affected by fertilisation system introduction leguminous crops into crop rotation. Меthods. Field experiment analytical method. Results. The data on humus, grain fields rotation under effect different systems are presented. It was established that soil increased significantly with application organo-mineral system, while factor field insignificant. mineral inferior to one terms its key fertility indicators soil. Conclusions. fertilisers both promoted an increase layer 0.02−0.05% 0–30 cm compared zero (control). At same time, N33.3Р13.3K20 N50P20K30 pea provided a slightly higher control than buckwheat – 0.02% 0.01%, respectively. maximum − 4.06% 3.86% 30–40 achieved + green manure harvest residues ensuring 0.13% 0.02%, respectively, control. Mobile contents were mainly system. They highest (N50P20K30 residues): 138 mg/kg 103 116 67 layer, exceeding 18 mg/kg, 25 7 5 combined organic amount income ensured their forms. much less effective organic-mineral impact potassium. did not affect fertility.