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- W2043532491 abstract "Climatically driven crop-water stress as a function of soilwater regimes, evaporative demands, and crop phenology are principle determinants of dryland wheat yields, but it has been very difficult to quantify and integrate these major variables in a systematic method for yield predictability. The soil-plant-air-water model (SPAW) was calibrated with 3 years of detailed soilwater observations and applied to a 20 year test period (1964–1983) for the Wimmera crop-reporting district of western Victoria, Australia. The daily integrated water stress index (WSI) correlated quite well with grain yields from the region. Soil water at the single dates of planting or anthesis were not related to crop yield owing to variability of precipitation and evaporative demand during the growing season. Excessively wet years which had yield depression due to waterlogging were readily identified. The beneficial effect of achieving early anthesis dates by either planting date or variety selection was clearly demonstrated for this climate where evaporative demand quickly exceeds water availability as the spring months progress. Multiyear crop yield risk probabilities were defined by analyzing crop-water stress for 100 years of simulated daily weather. These results demonstrate that climatic impact on dryland grain yield can now be defined very effectively and efficiently by the use of a moderately complex simulation model for daily integration of the principle variables." @default.
- W2043532491 created "2016-06-24" @default.
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- W2043532491 date "1992-04-01" @default.
- W2043532491 modified "2023-10-16" @default.
- W2043532491 title "Climatic impacts on dryland winter wheat yields by daily soilwater and crop stress simulations" @default.
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- W2043532491 doi "https://doi.org/10.1016/0168-1923(92)90060-h" @default.
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