Venkata Subba Rao .P2014-05-062014-05-061974http://krishikosh.egranth.ac.in/handle/1/2059334en-USnitrogen, costs, yields, rice, fertilizers, diseases, profit, economics, physical control, byproductsProduction Functions And Economic Optima For Nitrogen Fertilizer User For Some Varieties Of Rice And Jowar In Andhra Pradesh.Thesis