00357nam a2200073Ia 4500008004100000082002000041245017100061260005100232220204s9999    xx            000 0 und d  a631.81:633bIIS 0aImpact of fertilizer and manure use for three decades in crop productivity and sustainability and soil quality under soybean-wheat system on vertisol in central India  aBhopalbIndian Institute of Soil Sciencec2007