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Abstract:
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Time trend analyses of yields of wheat, barley and oats in Western Australia have been made using simple linear regression. The majority of shires exhibit a reduction in actual yield as a percentage of calculated potential yield (Yact/Ypot) in higher rainfall years. Barley and oat production proved to be more variable than wheat, and displayed a greater capacity to improve yield during this period. Recent breeding work and improvements in mangement techniques have presumably contributed to the rate of inc
lue crops, than aiming to increase yields. Improved management with time has been implicated in many low rainfall shires where yields have attained a higher percentage of their potential, whilst actual yields are static or have declined. Maximum values rrent systems for wheat and barley production in Western Australia may be more efficient at converting rainfall to grain yield in drier years.
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