Differential Tolerance of Cotton Varieties to an Acid Soil High in Exchangeable Aluminum1
- C. D. Foy,
- W. H. Armiger,
- A. L. Fleming2 and
- C. F. Lewis3
Fourteen varieties of cotton, adapted to various regions of the Cotton Belt of the United States, were screened for AI tolerance by growing them for 56 days in a greenhouse on AI-toxic Bladen clay loam (pH 4.4) treated with increasing levels of CaCO3. The varieties differed significantly in top growth on the unlimed soil and in their response to CaCO3 additions. In general, liming the acid soil to about pH 5.4 tended to equalize top yields of sensitive and tolerant varieties and permitted each to attain near maximum yield.
Contrary to predictions, the varieties showing greatest tolerance to the acid soil, ‘Pima S-2,’ ‘Acala 47–42,’ and ‘Acala 44–10,’ are western in origin and adaptation. Varieties showing the least tolerance were ‘Coker 100A,’ ‘Deltapine Smooth Leaf,’ and ‘Acala 1517D,’ which were developed in the Eastern, Delta, and Western regions, respectively. Differential tolerance between two extreme varieties, Coker 100A and Pima S-2, was also reflected by root yields.
These results suggest the possibility of breeding cotton varieties with even greater abilities to send their roots into acid subsoils of the Southeast, where shallow rooting of crops may be due, in part, to AI toxicity.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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