A Comparison of Soybean Leaf Water Potential and Leaf Temperature under Progressive Drought1
- H. D. Scott,
- P. K. Jung and
- J. A. Ferguson2
Information is limited on the relationship between leaf water potential (Ψ) and leaf temperature (T) of soybeans [Glycine max (L.) Merr.] grown in the field. Therefore, measurements of Ψ and T were made with a pressure chamber and infrared thermometer, respectively, in five study periods during a field study in 1978. The season was characterized by progressive drought. ‘Forrest’ soybeans were grown at two moisture regimes on a Crowley silt loam (Typic Albaqualf).
Linear relationships were found between T and Ψ. Leaf temperature of the nonirrigated soybeans was more sensitive to changes in Ψ than that of the irrigated soybeans and became more sensitive as the drought progressed. The regression equations relating Ψ to T in each of the five study periods were not unique for a given moisture treatment. However, the regression equations expressing the Ψ vs. T relationship for the single linear equation would suffice for describing the Ψ vs. T relationship throughout the season for each moisture treatment, but a different one would be required to express that relationship for a different moisture treatment.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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