Siose, T. K., Kader, M. A., & Tulin, A. B. (2017). Determination of limiting nutrient to Sweetpotato (L.) growth on Samoa Oxisol using a Ipomoea batatas Nutrient Omission Technique. Annals of Tropical Research, 39(1), 105–119. https://doi.org/10.32945/atr3917.2017