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Published in Soil Sci Soc Am J 34:263-267 (1970)
© 1970 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Aluminum Toxicity and Phosphorus Fixation on Crop Growth on Oxisols in Natal1

N. G. Reeve and M. E. Sumner2

ABSTRACT

Simple, routine methods for estimating exchangeable Al and P-fixing capacity of acid soils are described. A glass-house study on eight Oxisols revealed marked growth response of ‘trudan’ (Sorghum sudanense) to amelioration by lime, gypsum, and Ca silicate which is ascribed to elimination of Al toxicity rather than to improved P availability. Growth response to ameliorants took place up to the point of elimination of exchangeable Al after which a significant reduction in yield occurred. P fixation is shown to be a major fertility limitation in the soils studied. Since no apparent relationship between P fixing capacity and exchangeable Al existed and since lime did not decrease P fixation despite its ability to eliminate soluble Al, it is concluded that P fixation is the result of an adsorption reaction rather than a precipitation reaction. Although the soils studied are all capable of fixing large quantities of P considerable variation exists between them. Fertilizer recommendations based only on an estimate of available P in the soil per se could thus be in serious error.

NOTES

1 Contribution from the Department of Soil Science, University of Natal, Pietermaritzburg, S. Africa. Supported in part by the department of Agr. Tech. Serv. of the Republic of South Africa.

2 Graduate Student and Senior Lecturer, respectively.

Received for publication July 16, 1969. Accepted for publication October 24, 1969.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1970 by the Soil Science Society of America.