00390nam a2200121Ia 4500008004100000082003100041100002100072245005900093260002800152300001500180600001500195650005800210140224s9999    xx            000 0 und d  a581.1:631.41:633(082.2) L7  aGupta, U.S., ed.  aPhysiological aspects of crop nutrition and resistance  aDelhibAtma Ramcc 1977  aviii,383p.  aU.S. Gupta  aPlant physiology,Field crops-cultivation,Soil testing