Response of wheat under sub-humid irrigated conditions to atmospheric misting during grain filling
✍ Scribed by D.R. Laing; R.A. Fischer
- Publisher
- Elsevier Science
- Year
- 1975
- Weight
- 445 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Laing, D. R. and Fischer, R. A., 1975.
Response of wheat under sub-humid irrigated conditions to atmospheric misting during grain filling. Agric. Meteorol., 15: 285--293.
Atmospherically-induced plant water deficit and/or high temperature effects have been postulated as possible limitations to grain yield in irrigated sub-humid environments. An experiment was conducted in northwest Mexico to test this hypothesis, using a high yielding dwarf variety of wheat (Triticum aestivum cv Yecora 70) grown under intensive irrigation. Misting during grain filling was automatically activated at ear temperatures above 25°C. Measurements of xylem water potential (kOx) and leaf relative water content (LRWC) on the control and misted areas, respectively, showed mean daily (13h30--15h30) values of 14.5 and 9.5 bars for ~x and 85.5 and 90.5% for LRWC. Stomatal resistance measurements indicated no difference between the two treatments throughout a diurnal cycle. Grain growth rate was slower in the misted treatment, apparently as a result of lower ear temperature. Treatments had no effect on final grain size and grain yield. Atmospherically-induced stress did not appear to limit grain yield under the meteorological conditions experienced during this experiment.