@book{51992,
	author = {Singh, Krishna Nand.},
	title = {Effect of Integrated Nutrient Supply on Soil Humus, Surface Reaction of Phosphate and Nitrogen Losses in Relation to Their Availability in Calcareous Soil / },
	publisher = {: RAU},
	year = {, 1988},
	address = {.- Pusa, Samastipur}
}