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Nitrogen Uptake of Field-grown Cotton. I. Distribution in Plant Components in Relation to Fertilization and Yield

Published online by Cambridge University Press:  03 October 2008

D. M. Oosterhuis
Affiliation:
Cotton Research Institute, PO Box 530, Gatooma, Zimbabwe
J. Chipamaunga
Affiliation:
Cotton Research Institute, PO Box 530, Gatooma, Zimbabwe
G. C. Bate
Affiliation:
Cotton Research Institute, PO Box 530, Gatooma, Zimbabwe

Summary

Three levels of nitrogen (N) were applied to cotton grown in irrigated field trials at two locations in Zimbabwe in 1978. Dry matter (DM) production, total uptake and distribution of N among vegetative and reproductive components, and soil mineral-N contents were recorded about every 14 days. About 60% of total DM was produced, and 40% of total N taken up, between 10 and 16 weeks after sowing. Most N was present in vegetative parts, particularly leaves and branches, during early growth but, later, it accumulated in buds, flowers and bolls. At maturity, seeds and lint contained 42% of total above-ground plant N. N concentrations were similar in sympodial and mainstem leaves, petioles and branches. Inorganic N applied at sowing had little effect on plant N, but when given after 10 weeks it increased the N content of leaves, stems, branches, petioles and bolls.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1983

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