TY - BOOK AU - Ragini Kumari TI - Zinc Management Through Long Term Crop Residues Incorporation to Rice-Wheat System Under Calciorthent / U1 - 631.422 PY - 2003/// CY - .- Pusa, Samastipur PB - : RAU KW - Soil Science KW - Zinc Management KW - Rice - Wheat KW - Thesis KW - M. Sc ER -