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Net assimilation rate of cotton in relation to spacing

Published online by Cambridge University Press:  27 March 2009

J. G. Bhatt ,
R. C. Shah  and
A. N. Sharma
J. G. Bhatt
Affiliation:
Indian Agricultural Research Institute, Regional Station, Coimbatore 641003
R. C. Shah
Affiliation:
Indian Agricultural Research Institute, Regional Station, Coimbatore 641003
A. N. Sharma
Affiliation:
Indian Agricultural Research Institute, Regional Station, Coimbatore 641003
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Summary

The net assimilation rates (NAR) of three genotypes of cotton differing in their growth habit were studied under different spacings. The NARs of a very bushy type, G 67, and a comparatively less spreading type, IAN 560, were the same but that of a compact type, IAN 579, was twice as much when the leaf area index (LAI) was one. Though subsequently in G 67 and IAN 560 NAR under varying spacings either decreased less rapidly or remained steady, the decrease was nearly Hnear with increasing LAI. However, for IAN 579 dependence of NAR on LAI was generally positive indicating genotypic improvement. Under different spacings the leaf-density dependance of NAR appeared to have been decreased in IAN 560, but was nearly absent in IAN 579 with more efficiency towards increasing the yield of seed cotton.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 86 , Issue 2 , April 1976 , pp. 281 - 285
Copyright
Copyright © Cambridge University Press 1976

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References

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