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Published online 1 July 1968
Published in Agron J 60:353-356 (1968)
© 1968 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Fertilizer Nitrogen, Phosphorus, Potassium and Magnesium on Yield and Nutrent Content of Okra (Hibiscus esculentus L.)1

N. Ahmad and 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.

Key Words: fertilizer response • nutrient uptake

1 Paper submitted from the Faculty of Agriculture, University of the West Indies, St. Augustine, Trinidad. Assistance given by Messrs C. Davis and B. St. Rose (graduate students) in field work and by the Central Analytical Laboratory (U.W.I.) carrying out some of the analyses is gratefully acknowledged.

2 Senior Lecturer in Soil Science and graduate student.

Received for publication April 24, 1967.




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Environmental Quality		 The Plant Genome
Copyright © 1968 by the American Society of Agronomy.