Fertilizer use : nutrition and manuring of tropical crops / A. Jacob, H.V. Uexkull. Jacob, A. Uexkull, H.V. Fertilizers 631.8 JAF Includes bibliographical references and index. Hannover : Verlagsellschaff fur Ackerbau mbh, c1963. c1963. 1963 Text 617 p. : eng