(NaGRO\KONOMI^ESKIE PROBLEMY POWY[ENIQ PLODORODIQ PO^Ws - (NrUDAJ(B,(Ni(B. (Nd(B.s (NiWAN dMITRIEWI^s ((Nm(B.s (NrOSSELXHOZIZDATs, 1985)
Keywords: (NpLODORODIE PO^WYs -- (NcENTRALXNO(B-(N^ERNOZEMNYE OBLASTI rsfsrs