00270nam a22001097a 4500020001800000040000600018082001600024100001900040245007700059260001400136300001000150  a9781780642789  c-  a633bKUM/NU  aKumar, Prakash  aNutrient Deficiencies Of Field CropsbGuide to Diagnosis And Management   a UKbCABI  a378p.