Early sowing with wheat cultivars of suitable maturity increases grain yield of spring wheat in a short season environment [Western Australia].
1992
Kerr N.J. | Delane R.J. | Siddique K.H.M.
In field trials in the north-eastern wheatbelt of Western Australia using 7 commercial cultivars with a wide range of developmental patterns and maturities, sowing between mid May and early June produced the highest grain yields. For plantings after early June, yields declined by approximately 250 kg per ha (15 percent) per week. Delayed sowing caused a decrease in dry matter and kernel number. In general this reduction in kernel number was not compensated by an improvement in kernel weight. At early times of sowing, the medium-long season cultivars generally had higher yields than short season cultivars. The short season cultivars were the highest yielding cultivars at the late times of sowing. These results suggest that cultivars should be chosen to suit the seasonal break, which may vary from late April to mid June. As a consequence, farmers should be encouraged to retain a number of cultivars with differing maturities suited to a range of planting times.
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