SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 34:94-98 (1970)
© 1970 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Leaf Composition and Yield Response of Corn in Relation to Quantity-Intensity Parameters for Potassium1

J. T. Koch, E. R. Orchard and M. E. Sumner2

ABSTRACT

Data obtained by the quantity-intensity (Q/I) technique were tested against field experimental results to assess the value of the Q/I approach for characterising the potassium (K) status of soils. Q/I data describe K status by relating the energy level or intensity (I) of K in the labile pool to the amount (Q) present.

It was shown that in a leached ferrallitic soil (Oxisol), the pool of labile K is a good index of the amount available to corn (Zea mays L.). It is superior as a criterion to both the equilibrium activity ratio and exchangeable K.

Potassium content of the leaf is related to the pool of labile K free to participate in the mechanisms by which K is supplied to roots. Critical values for K in the labile pool at the beginning of the growing season are proposed, below which K deficiency is likely to reduce corn yield.

NOTES

1 Contribution from the Department of Soil Science, University of Natal, Pietermaritzburg, S. Africa. Supported in part by the Department of Agricultural Technical Services of the Republic of South Africa. Presented before Div. S-4, American Society of Agronomy, Nov. 13, 1968, New Orleans, La.

2 Research Soil Scientist, College of Agriculture, Cedara, S. Africa and Professor and Senior Lecturer, respectively.

Received for publication June 27, 1969. Accepted for publication September 17, 1969.






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Copyright © 1970 by the Soil Science Society of America.