00302cam a2200121ua 4500020001800000082001600018100001900034245004400053250000800097260004600105300001100151700001800162  a9789327256378  a630bSIN/PR  aSingh, S S   .  aPrinciples and practices of agronomy /   a5th  aNew Delhi : bKalyani Publishers , c2016  a348; .  aSingh, Rajesh