Change of the content and stores of humus in sod-podzolic sewed soil at different fertilizer systems

Abstract

The purpose. To study productivity of different fertilizer systems (mineral, organic and organo-mineral) in short crop rotations in view of assessment of change of the content and stores of humus in sod-podzolic sandy loam soil on sewed lands. Methods. Field — study of influence of fertilizer systems on change of humus state of sod-podzolic soil, laboratory — determination of the content of humus, mathematical-and-statistical - analysis of variance. Results. By probes it is proved that the most essential incremental va-l ues of the content and stores of humus is registered in soils under field crop rotation. Conclusions. Long (more than 30-years) importation of 20 t/hectare of crop rotation area of muck and 10 t/hectares of muck together with green manure crop promoted essential augmentation of the content and stores of humus in 2 short crop rotations.