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This article in AJ

  1. Vol. 60 No. 4, p. 353-356
    Received: Apr 24, 1967

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Effect of Fertilizer Nitrogen, Phosphorus, Potassium and Magnesium on Yield and Nutrent Content of Okra (Hibiscus esculentus L.)1

  1. N. Ahmad and
  2. L. I. Tulloch-Reid2



Response of okra (Hibiscus esculentus L.) to N (0–336 kg/ha), P (0–280 kg/ha), K (0–280 kg/ha), and Mg (0–112 kg/ha) fertilization on River Estate Loam, Trinidad, was investigated. Best yields were obtained with 112 kg/ha N, 168 kg/ha P, 280 kg/ha K, and 112 kg/ha Mg. The effect on leaf composition of N, P, K, and Mg at three stages of growth of the crop and the amount of these nutrients removed in the fruit was studied. Levels of N in the leaf decreased rapidly with age and for rates above 224 kg/ha followed a similar pattern as the control. For 112- and 168-kg/ha applications, high tissue N was maintained to the fruiting stage. N removed in the fruit increased with N and K applications but was adversely affected by P and

P content in the leaf was not affected by fertilization at flowering and senescence but at fruiting the levels increased. P applications did not increase yield of dry matter or removal of N, K, Ca and Mg in the fruit. At flowering, tissue K was highest and showed response to fertilizers. With age of crop K decreased and effect of fertilizers disappeared. K removal in the fruit was favored by N.

High tissue Mg as a response to fertilization was maintained to fruiting but decreased afterwards. Mg lowered the removal of N but increased P in the fruit.

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