Jacobs, BC & Clarke, J 1993, 'Accumulation and partitioning of dry matter and nitrogen in traditional and improved cultivars of taro (Colocasia esculenta (L.) Schott) under varying nitrogen supply', Field Crops Research, vol. 31, no. 3-4, pp. 317-328.
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Accumulation and partitioning of dry matter and N were examined in two traditional and two improved cultivars of taro for a 30-day period under four levels of N ranging from 0 to 32 mM N in sand culture. Raising the supply of N increased the number of leaves, the surface area of leaf and root, and the dry weight of leaf, root and petiole but not the corm. Cultivars differed mainly in dry weight and surface area of roots. Dry weight of the whole plant increased because the area of leaf increased, and the efficiency of leaves (net assimilation rate) improved under high levels of applied N. The concentration and content of N in the whole plant increased with the level of applied N, and there was a 12-fold increase in average rates of accumulation of N over the treatments. Concentration, content and uptake of N were not significantly influenced by cultivar. However, significant differences in the accumulation of N, expressed on the basis of root surface area, suggested there may be differences between cultivars in the efficiency of N uptake. Increasing the supply of N changed the partitioning of dry matter and N between parts of the plant in favour of above-ground components (leaf and petiole). The results suggest that N availability in the soil is one of the determinants of biomass production in taro and that management of N nutrition for corm production may need to take account of changes in partitioning of dry matter and N that occur under varying supplies of N. © 1992.
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