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Significance of the Coupling between Saturation Vapour Pressure Deficit and Rainfall in Monsoon Climates

Published online by Cambridge University Press:  03 October 2008

J. L. Monteith
J. L. Monteith
Affiliation:
Laboratory for Terrestrial Physics, NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
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Summary

In monsoon climates, the mean daytime saturation vapour pressure deficit (D), measured at screen height, decreases from a maximum of 3–4 kPa attained several months before rain arrives to a minimum of 0.5–1 kPa in the month of highest rainfall. Climatic records from India and West Africa were analysed to give the relation between D and precipitation (P mm month−1) as:

where n ranged from 0.5 to 0.9 between stations.

The dependence of dry matter production on D and therefore on P is evaluated when growth is restricted by rain and when this restriction is removed by irrigation. In the first case, the decrease in demand for water associated with a decrease in D is comparable in importance with the increase of water supply (P). The analysis has implications for the marginal response of crops to supplemental irrigation and for the interpretation of experiments with a line-source or rain-shelter.

Type
Research Article
Information
Experimental Agriculture , Volume 22 , Issue 4 , October 1986 , pp. 329 - 338
Copyright
Copyright © Cambridge University Press 1986

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References

REFERENCES

Bierhuizen, J. F. & Slatyer, R. O. (1965). Effects of atmospheric concentration of water vapour and CO2 in determining transpiration photosynthesis relationships. Agricultural Meteorology 2:259–270.CrossRefGoogle Scholar
Choudhury, B. J. & Monteith, J. L. (1986). Saturation deficit, stomatal response and the heat balance of vegetation. Agricultural Meteorology 36:215–225.Google Scholar
Davenport, D. C. & Hudson, J. P. (1967). Changes in evaporation rates along a 17 km transect in the Sudan Gezira. Agricultural Meteorology 4:339–352.Google Scholar
El-Sharkawy, M. A., Cock, J. H. & Held, A. A. H. (1984). Water use efficiency of cassava: II differing sensitivity of stomata to air humidity in cassava and other warm-climate species. Crop Science 24:503–507.CrossRefGoogle Scholar
Gregory, P. J. (1984). Water availability and crop growth in arid regions. Outlook on Agriculture 13:208–215.CrossRefGoogle Scholar
Griffiths, J. F. (1972). Nigeria. Semi-arid zones. In World Survey of Climatology, Vol. 10, Chapters 5 and 6 (Ed. Griffiths, J. F.). Amsterdam: Elsevier.Google Scholar
Monteith, J. L. (1986). How do plants manipulate water supply and demand? Philosophical Transactions of the Royal Society of London A316:245–259.Google Scholar
Morison, J. & Gifford, R. M. (1983). Stomatal sensitivity to carbon dioxide and humidity. Plant Physiology 71:789–796.Google Scholar
Rao, Y. P. (1981). The climate of the Indian sub-continent. In World Survey of Climatology, Vol. 9, Chapter 2 (Eds Takahashi, K. & Arakawa, H.). Amsterdam: Elsevier.Google Scholar
Schulze, E. D. & Hall, A. E. (1982). Stomatal responses, water loss and CO2 assimilation rates of plants. In Encyclopedia of Plant Physiology, Vol. 12B (Ed. Lange, O. L. et al. ) Berlin: Springer-Verlag.Google Scholar
Tanner, C. B. (1981). Transpiration efficiency of potato. Agronomy Journal 73:59–64.Google Scholar
Tanner, C. B. & Sinclair, T. R. (1983). Efficient water use in crop production. In Limitations to Efficient Water Use, 1–27. (Eds Taylor, H. H., Jordan, W. R. & Sinclair, T. R.). Madison, Wisconsin: American Society of Agronomy.Google Scholar