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Tjhia B, Aziz SA, Suketi K. Correlations between Leaf Nitrogen, Phosphorus and Potassium and Leaf Chlorophyll, Anthocyanins and Carotenoids Content at Vegetative and Generative Stage of Bitter Leaf (Vernonia amygealina Del.). JTCS [Internet]. 2018 Feb. 1 [cited 2025 Apr. 26];5(1):25-33. Available from: https://j-tropical-crops.com/index.php/agro/article/view/143