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Critical concentrations of potassium in cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  27 March 2009

D. Singh ,
M. S. Brar  and
A. S. Brar
D. Singh
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana - 141004, India
M. S. Brar
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana - 141004, India
A. S. Brar
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana - 141004, India
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Summary

Potassium concentrations in various plant parts of cotton (Gossypium hirsutum L.) at different growth stages were determined in field experiments in Punjab, India, in 1987, for plots fertilized at sowing and flowering, and these were compared with the final seed cotton yield. The optimum time of sampling for predicting relative yield depends on the time of K fertilizer application: if applied at sowing, plants should be sampled before the peak flowering stage (70 days after sowing, DAS); if applied at flowering (50 DAS), plants should be sampled 90–115 DAS. Critical K concentrations (% K. in dry matter) in the plant parts measured at different growth stages were 3·26 in the petioles of the third leaf from the top at flower initiation; 0·69 and 0·90 in blades and petioles of a lower leaf (first or second healthy leaf from the bottom of plant) respectively, and 2·60 in the petioles of the third leaf (young, fully mature leaf from the top of the plant) at peak flowering stage; 0·85 in blades of the third leaf, 0·53 and 0·50 in blades and petioles of a lower leaf, respectively, at the boll development stage; 0·70 and 2·85 in blades and petioles of the third leaf and 0·68 in petioles of a lower leaf at boll opening stage.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 118 , Issue 1 , February 1992 , pp. 71 - 75
Copyright
Copyright © Cambridge University Press 1992

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References

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