Photosynthetica 2004, 42(2):251-255 | DOI: 10.1023/B:PHOT.0000040597.62743.5b

Influence of Potassium Nutrition on Gas Exchange Characteristics and Water Relations in Cotton (Gossypium hirsutum L.)

H. Pervez1, M. Ashraf2, M.I. Makhdum1
1 Department of Chemistry, Bahauddin Zakariya University, Multan, Pakistan
2 Department of Botany, University of Agriculture, Faisalabad, Pakistan

The effects of potassium nutrition [0, 6.25, 12.50, 25.00 g(K) m-2 of K2SO4 or KCl] on gas exchange characteristics and water relations in four cultivars (CIM-448, CIM-1100, Karishma, S-12) of cotton were assessed under an arid environment. Net photosynthetic rate (PN) and transpiration rate (E) increased with increased K supply. The leaf pressure potential (Ψp) increased significantly by the addition of 25.00 g(K) m-2 compared to zero K level. The water use efficiency (PN/E) was improved by 24.6 % under the highest K dose compared to zero K. There were positive correlations (0.99**, 0.98**, 0.95**, 0.97**) between K-doses and PN, E, Ψp, and PN/E, respectively.

Keywords: net photosynthetic rate; osmotic potential; pressure potential; stomatal conductance; transpiration rate; water-use efficiency

Published: June 1, 2004Show citation

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Pervez, H., Ashraf, M., & Makhdum, M.I. (2004). Influence of Potassium Nutrition on Gas Exchange Characteristics and Water Relations in Cotton (Gossypium hirsutum L.). Photosynthetica, 42(2), 251-255. doi: 10.1023/B:PHOT.0000040597.62743.5b.
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