Flooding and Soil Temperature Effects on Wheat During Grain Filling1
- R. J. Luxmoore,
- R. A. Fischer and
- L. H. Stolzy2
The root environment of wheat (Triticum aestivum L. em Thell) was modified with flooding and soil temperature treatments during the grain filling stage in an assessment of the relation between root respiration and grain yield. Short term flooding (10 to 15 days) at to 17C soil temperature in a pot and field experiment did not influence yield. Longer term flooding (20 to 30 days) reduced yield by 15 to 23% at 15 to 17C soil temperature and by 73% at 95C soil temperature. Yield reduction was associated with smaller mean grain weight. At 5C soil temperature 30 days of flooding had no significant effect on yield. Stem dry weight per tiller decreased by about 95% with increase in soil temperature from 5 to 25C for both flooded and nonflooded treatments. Mathematical simulation estimates of root respiration applied to the experimental conditions indicated that roots were a minor sink for assimilate during the grain filling stage. Root environmental effects on wheat yield could not be interpreted in terms of roots being competitive with the developing grain for photosynthate. The significant effects of soil conditions on the maturing wheat plant indicate some importance of roots and root environment during the grain filling stage.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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