Productivity of the natural phytocenosis and maize for silage in stubble sowings under two ways of the biomass yield usage in Kirov FSSU in Khasavyurtovskiy district in the crop rotation link “winter wheat+stubble crops+maize for grain” are studied. The soil is light-brown heavy clay loam. It was found that during stubble period after winter wheat harvesting it can be obtained 21.9 t/ha of the natural phytocenosis herbage and 33.0 t/ha maize for grain. However, cultivation of the stubble corn is associated with additional financial and material-and-technical outgoings. Plowing under of the herbage and application of fertilizers and winter wheat straw without tillage operations during nature phytocenosis yield formation contributes to improving of the soil fertility indicators. The number of agronomically the most valuable structure aggregates in the topsoil layout are increasing to 63%, soil porosity- to 54.2%, soil density is reduced to 1.20 g/ cm3, soil nutritive regime is improving. The soil fertility indicators optimization allows to increase yield of next corn in crop rotation with a phytomass plowing under to 36.2, stubble corn- to 46.0 %