Abstract
Sweetpotato is an important tuber crop for the food security in Island countries of the South Pacific. The allometric relationship between tissue nitrogen (N) concentration and aerial dry matter is unknown. We determined critical N (Nc) content from vegetative stage to harvesting, and estimated the range of variation in N nutrition index (NNI) from two field experiments with varied rates of N (0, 25, 60, 125 and 180 kg N ha−1 in 2015 and 0, 50, 125, 175 and 250 kg N ha−1 in 2017). A unified critical N curve (Nc = 3.338 W−0.307) where W = aerial dry matter with W ≥ 1.38 t ha−1, was constructed based on the N concentration in the aerial dry matter. The calculated NNI ranged from 0.69 to 1.23 in 2015 and 0.54 to 1.17 in 2017. The preliminary Nc dilution curve and NNI determined could potentially be used as a parameter for N management.
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