Katayama, K and Ito, O and Adu-Gyamfi, J J and Rao, T P (2000) Analysis of Relationship between Root Length Density and Water Uptake by Roots of Five Crops Using Minirhizotron in the Semi-Arid Tropics. JARQ - Japan Agricultural Research Quarterly, 34 (2). pp. 81-86. ISSN 0021-3551