@INPROCEEDINGS {MAURYA:1977b, title = {Effect of gravel concentration, Inter-Gravel density and soil moisture regime on radical elongation}, author = {Maurya, P. R. and Lal, R. }, booktitle = {In "Role of soil physical properties in maintaining productivity of tropical soil," held at IITA Ibadan}, year = {1977}, doi = {6-10 december}, }