Rainfall-yield relationships across the Australian wheatbelt
A network of rainfall stations was selected across the Australian wheatbelt and monthly rainfall regressed with wheat yields from the surrounding shires for the period 1976-87. Yields were found to be strongly related to fluctuations in total rainfall amount and the seasonal distribution of rainfall...
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| Veröffentlicht in: | Australian journal of agricultural research 1998, Vol.49 (2), p.211-224 |
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| creator | STEPHENS, D. J LYONS, T. J |
| description | A network of rainfall stations was selected across the Australian wheatbelt and monthly rainfall regressed with wheat yields from the surrounding shires for the period 1976-87. Yields were found to be strongly related to fluctuations in total rainfall amount and the seasonal distribution of rainfall through the year. These temporal relationships vary spatially and appear to be regulated by the water-holding capacity of regional soils. Sixteen agrometeorological zones were defined with similar rainfall-yield relationships. In all these, autumn rains that permit an early sowing, and finishing rains after July, are most important for higher yields. As the rainfall distribution becomes more winter-dominant, both crop yield variability and the usefulness of high winter rainfall decreases. Heavy rainfall in the month after sowing can have a negative effect in southern Australia, as plants are more prone to suffer potential yield losses from a wet soil profile. Waterlogging has a large negative effect in the south-west of Western Australia, such that the rainfall distribution can be more important than the rainfall amount. Rainfall-yield correlations are generally more positive in drier regions, and are enhanced by persistent rainfall anomalies between April and November during El Niño Southern Oscillation years. Keywords: agrometeorology, waterlogging, correlation, variability, spatial, temporal. Australian Journal of Agricultural Research 49(2) 211 - 224 Full text doi:10.1071/A96139 © CSIRO 1998 |
| doi_str_mv | 10.1071/A96139 |
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Heavy rainfall in the month after sowing can have a negative effect in southern Australia, as plants are more prone to suffer potential yield losses from a wet soil profile. Waterlogging has a large negative effect in the south-west of Western Australia, such that the rainfall distribution can be more important than the rainfall amount. Rainfall-yield correlations are generally more positive in drier regions, and are enhanced by persistent rainfall anomalies between April and November during El Niño Southern Oscillation years. Keywords: agrometeorology, waterlogging, correlation, variability, spatial, temporal. 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| subjects | Agricultural and forest climatology and meteorology. Irrigation. Drainage Agricultural and forest meteorology Agronomy. Soil science and plant productions Biological and medical sciences Climatology, meteorology Fundamental and applied biological sciences. Psychology General agronomy. Plant production Generalities. Techniques. Climatology. Meteorology. Climatic models of plant production |
| title | Rainfall-yield relationships across the Australian wheatbelt |
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