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- W2034764024 abstract "A theoretical basis is presented for the relationship between crop yield and one time-of-day measurements of the foliage-ambient temperature differential (Tf — Ta). The theory was used to analyse two contrasting relationships between wheat yield and Tf — Ta. The relationships resulted from a range of irrigation treatments and two times of sowing imposed on 26 plots. This caused yields to vary from 8.3 to 1.7 t ha−1 when the crop was sown in June and from 5.5 to 2.2 t ha−1 when sown in August. To explain these variations Tf — Ta and associated micrometeorological data were collected around solar noon during the period from jointing to maturity. From these data transpiration and the associated aerodynamic and canopy stomatal resistances to water vapour transport were predicted. The associated canopy conductances for diffusion of CO2 were derived and used to predict the corresponding CO2 assimilation rates. The predicted transpiration and CO2 assimilation rates were closely related to yield within each year but not between years. However if the rates were normalised for the shorter growing season of the late sown crop the yields from the 26 plots formed a common relationship. The transpiration vs. yield relationship was further improved by normalising for differences in foliage vapour pressure deficit. The good agreement between field data and theory was probably due to the dominating effect of stomatal control on both Tf — Ta and CO2 assimilation rate. If CO2 assimilation rate is strongly influenced by factors other than soil water stress then the theory may not hold and a different relationship may exist. It was concluded that infrared thermometry is a useful technique for studying yield variations in agronomic experiments where these variations are due to stomatal control." @default.
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- W2034764024 date "1985-12-01" @default.
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- W2034764024 title "Relationship between wheat yield and foliage temperature: theory and its application to infrared measurements" @default.
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- W2034764024 doi "https://doi.org/10.1016/0168-1923(85)90005-x" @default.
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