00310nam a2200109Ia 4500008004100000082002200041100002400063245004200087260003900129300001000168650002200178140113s9999    xx            000 0 und d  a631.4:633.002  M4  a" Mishra, Pratibha"  aSoil productivity and crop potentials  b"Concept publishing company, 1984"  a274p.  aSoil productivity