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Published in Soil Sci Soc Am J 38:524-529 (1974)
© 1974 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Response by Flooded Rice to Phosphate Rocks Varying in Citrate Solubility1

O. P. Engelstad, Aroon Jugsujinda and S. K. De Datta2

ABSTRACT

Studies were conducted in the greenhouse and in the field to evaluate several phosphate rocks for flooded rice (Oryza sativa L.). A close relationship was found to exist between first-crop yield response to applied P and citrate solubility in a series of phosphate rocks representing the theoretical range in this parameter. Greenhouse (TVA) and field data (Thailand) showed quite similar results in this respect.

The same general pattern of effectiveness among sources persisted through the second crop as found for the first crop. The residual effectiveness of triple superphosphate (TSP) remained higher than that of the phosphate rocks; however, the relationship between initial citrate solubility of the phosphate rocks and relative effectiveness in the second crop was rather poor.

A procedure is presented which enables one to make the choice of P source on the basis of both agronomic effectiveness and prices of P in TSP vs. phosphate rock.

NOTES

1 Contribution from Soils and Fertilizer Research Branch, National Fertilizer Development Center, Tennessee Valley Authority, Muscle Shoals, AL 35660. This research was conducted jointly by TVA, the International Rice Research Institute, the Rice Department, Thailand, and was supported in part under an AID Participating Agency Service Agreement No. RA(QA)-5-69.

2 Agronomists at TVA, Ministry of Agriculture (Thailand), and the International Rice Research Institute, respectively.

Received for publication October 25, 1973. Accepted for publication February 8, 1974.






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Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
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Environmental Quality		 The Plant Genome
Copyright © 1974 by the Soil Science Society of America.