Critical nitrogen content and nitrogen nutrition index for sweetpotato crop

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.

• Publication year

  2019

• Venue

  Journal of plant nutrition

• Publication date

  2019-08-05

• Fields of study

  Agricultural and Food Sciences, Biology

• Identifiers
  DOI 10.1080/01904167.2019.1648685
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

• Nitrogen-Total

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