@INPROCEEDINGS {KANG:1979b, title = {Effects of liming and nitrogen application on cowpea (Vigna unguiculata (L.) Walp grown on an ultisol}, author = {Kang, B. T. }, booktitle = {Plant Nutrition; Proceedings of Eighth International Colloquium on Plant Analysis and Fertilizer Problems, edited by Ferguson A.R.; Bieleski and Ferguson,I.B.}, series = {DSIR Wellington Information series}, year = {1979}, volume = {134}, pages = {231--237}, }