00309nam a2200121Ia 4500008004100000082001100041100002300052245002900075260003400104300001400138600002200152650001300174140224s9999    xx            000 0 und d  a631 M9  aChandra De, Gopal.  aFundamentals of agronomy  aNew DelhibOxford & IBHc1989  avii,425p.  a Gopal Chandra De  aAgronomy