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“Mineral Nutrition of Cacao (Theobroma cacao L. ) IV-Effects of Nitrate and Urea Nitrogen on Deficiency Symptoms of Phosphorus, Potassium, Calcium and Magnesium in Sand Culture”, ta, vol. 42, no. 1, Jan. 1965, Accessed: Apr. 27, 2025. [Online]. Available: https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/3780