00425nam a2200157Ia 4500008004100000020001500041082001400056100001500070245004100085250000600126260003900132300000800171650004100179650003400220653001300254170901s2009    xx            000 0 und d  a8176638587  a631bS48P  aSingh, S.S 0aPrinciples and Practices of Agronomy  a3  aLudhianabKalyani Publishersc2009  a409  aAgriculture and related technologies  aTechnology (Applied sciences)  aAgronomy