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The Influence of Crop Environment on the Internal Water Balance of Cotton¹

ABSTRACT

The relative turgidity of cotton plants subjected to three soil moisture levels was related to soil moisture content, air temperature, pan evaporation, vapor pressure deficit, and air movement. A multiple regression equation that contained only those variables significant at the 1% level of probability was developed. The influences of vapor pressure deficit and air movement were not significant at the 1% level. Soil moisture, ambient temperature, and pan evaporation accounted for 87.5% of the variation in the relative turgidity of cotton leaves. Soil moisture alone accounted for 70.9% of the variation with a reduction to 44.3% upon discounting the effects of ambient temperature and pan evaporation. Ambient temperature and pan evaporation accounted for 43.1% of the variation with a reduction to 16.5% upon discounting the effect of soil moisture. The results demonstrate the relative importance of soil moisture and atmospheric conditions in regulating the internal water balance of plants.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Texas Agr. Exp. Sta. Presented before joint meeting of Div. I and Div. VI, Soil Sci. Soc. Am., Ithaca, N. Y., Aug. 22, 1962.

² Research Soil Scientist, USDA, Weslaco, Tex.

Received for publication January 28, 1963. Accepted for publication August 15, 1963.