Plucknett, Donald L. Detecting mineral nutrient deficiencies in tropical and temperate crops - Dehra Dun International Book Distributors 1989 - vii,552p. 22cm - Westview tropical agriculture series . ISBN: 8170891337 Subjects--Topical Terms: Soil scienceSpecific techniques; equipment, materials Dewey Class. No.: 631.4 / DET