00284nam a2200097Ia 4500008004100000082001900041100001600060245005300076260003900129700001800168220204s9999    xx            000 0 und d  a026.32916bGUP  aGupta,  A K 0aPractical manual for agricultural chemistry.Pt.1  aLudhianabKalyani Publishersc1989  aVarshney, M L