We have some data relating winter wheat yields with weather conditions in 5-year period. The analysis indicates, that a shorter drought periods, defined by the values of climatic water balance (Rainfall-Evapotranspiration) , up to about 10-15 days may increase wheat yields, and a clear negative effect of drought begins from 15-20 day of drought duration.
Do you know any studies on effects of drought duration on wheat, or other cereal, yields?
These papers and dissertation are about drought stress in maize, wheat, and barely cultivars, and maybe useful for you
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Impact on yield of drought duration is stage specific and also depends on temperature. if the drought was started at reproductive stage I think it would result in yield decline even if 10 days drought. Again more important is change in water relations of crop. Did you measure change in water status? water potential or relative water content in leaves? this would indicate if crop really faced stress at all.
Thank you very much, I agree that this effect is /must be stage specific. I don't the data you mentioned, we received dataregarding weather, very rough soil information, yields. But no direct water measurements in soil and plant tissues. The work is more statistical, thus there is certain incertainty regarding data we received, and particularly soil data.
Wheat is the winter crop. Our experience that only 2-4 irrigation required in its life span even excess water may hamper its yield performances. So, 15-20 rainless day/drought does not affect its yield performances.
Dear I was talking of winter wheat only. I worked on them for a while.
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