TY  - BOOK
AU  - KULDIP SINGH
TI  - Fate and efficiency of phosphorus and potassium applied on a long term basis to different crop rotations
U1  - T 631.452 K98F 
PY  - 2004///
CY  - Ludhiana
PB  - PAU
KW  - CROP ROTATION
KW  - SOILS -- PHOSPHORUS CONTENTS
ER  -