TY  - BOOK
AU  - Gupta,Madan Lal
TI  - Effect of cropping & fertilization practices on enrichment ratios for organic matter, nitrogen, & phosphorus on heavy soils
KW  - Nitrogen
KW  - Phosphorus
KW  - Soils
KW  - Cropping
KW  - Fertilization
KW  - Organic matter
ER  -