Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1969
Published in Agron J 61:60-64 (1969)
© 1969 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Nitrogen, Phosphorus and Potassium Levels and Clipping Frequency on the Forage Yield and Protein, Carotene, and Xanthophyll Content of Coastal Bermudagrass1

Glenn W. Burton, W. S. Wilkinson and R. L. Carter2

Omitting P and K from fertilizer that supplied 672 kg/ha of N to ‘Coastal’ bermudagrass (Cynodon dactylon (L.) Pers.) growing on a Tifton loamy sand of medium-available P and low-available K content reduced forage yield 45% without affecting the protein, carotene, and xanthophyll content of the grass. Increasing the ratio of P and K to N above a 4-1-2 (N-P2O5-K2O) fertilizer ratio failed to increase protein, carotene, and xanthophyll contents except at very high N rates (1,008 kg/ha). Excellent yields of carotene (4,838 g/ha) and xanthophyll (7,649 g/ha) were obtained from Coastal bermuda fertilized with 672 kg/ha of N with P2O5 and K2O to make a 4-1-2 ratio and cut at 21-day intervals. This forage averaged 18.0% protein.

Key Words: available soil phosphorus • available soil potassium • pH • Tifton loamy sand

1 Cooperative investigations at Tifton, Ga., of the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and the University of Georgia, College of Agriculture Experiment Stations, Coastal Plain Station, Tifton. Part of the Georgia Coastal Plain Exp. Sta. research on this investigation was carried out under Contract No. 12-14-100-7732(74) with the ARS, USDA, and supervised by the staff of the Field Crops Laboratory, Western Utilization Research and Development Division, Albany, Calif. 94710. Journal Series Paper no. 293, University of Georgia, College of Agr. Exp. Sta.

2 Research Geneticist, Crops Research Division, ARS, USDA, and the University of Georgia, College of Agr. Exp. Sta., Coastal Plain Station, Tifton 31794; former Biochemist, University of Georgia, College of Agr. Exp. Sta. (now Research Manager, Animal Health Products, Geigy Agricultural Chemicals, Ardsley, New York); and Soil Scientist, University of Georgia, College of Agr. Exp. Sta., Tifton; respectively.

Received for publication May 28, 1968.




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Journal of Natural Resources
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Environmental Quality		 The Plant Genome
Copyright © 1969 by the American Society of Agronomy.