The relationship between grain-protein content of wheat and barley and temperatures during grain filling [South Australia]. [Workshop paper]
1994
Correll, R. (Commonwealth Scientific and Industrial Research Organisation, Glen Osmond (Australia). Biometrics Unit) | Butler, J. | Spouncer, L. (Commonwealth Scientific and Industrial Research Organisation, Glen Osmond (Australia). Div. of Soils) | Wrigley, C. (Commonwealth Scientific and Industrial Research Organisation, North Ryde (Australia). Div. of Plant Industry)
Protein levels were predicted using multiple regression with the same regression coefficients for all sites. The locality effect is absorbed in the regression intercept derived for each site. Australian Standard White (ASW) wheat data for 109 silos throughout South Australia for the years 1971-1991 were analysed in relation to rainfall and temperatures at the closest weather station. Rainfall from May to September was associated with a decrease in ASW wheat grain protein, and more importantly, the number of days in October above 30 deg. C were positively associated with an increase in wheat grain protein levels. Analysis of protein data from malting varieties of barley (1982-1991) from 160 South Australian hundreds (districts of about 260 square km) again showed that increased rainfall between July and September was associated with decreased grain protein. However, the dominating influence was the number of days in a row in November above 35 deg. C, which was consistently associated with increased grain protein. This makes an interesting comparison with wheat where October temperatures were more important despite barley being harvested earlier than wheat.
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