AbstractNutrient uptake by well fertilized taniers of the Morada variety was maximum near harvest time, averaging 125, 15, 156, 48 and 25 kg/ha for N, P, K, Mg and Ca, respectively. Uptake of N and K increased rapidly, but that of P slowly, from planting to harvest. Uptake of Mg and Ca increased steadily up to 5-6 months, after which it fluctuated considerably. Leaf weight increased rapidly during the first 6 months, then decreased and then remained fairly constant until harvest. Leaf lamina of well fertilized taniers contained about 3.2% N, 0.25% P2O5, 2.3% K and 1.3% Ca. In two other experiments yields increased from an average of 11,450 kg of tubers/ha 12 months after planting, when taniers are usually harvested, to 28,235 kg/ha 12 months later. Yield of corms, which can be used as pig feed, increased from 9,660 to 45,000 kg/ha over the same period.
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