00435nam a2200121Ia 4500008004100000082001500041245007500056260006300131300001500194600001900209600001500228650007000243130903s9999    xx            000 0 und d  a631.81  N9  aPlant Nutrient Needs, Supply, Efficiency and Policy Issues : 2000-2025  aNew DelhibNational Academy of Agricultural Sciencesc1997  aviii,329p.  aJ.S.Kanwar ,Ed  aJ.C.Katyal  aFertilisers,Biofertilizers,Plant Nutrition,Sulphur,Green manuring