Key Points
- Two spring wheat cultivars, Kohika and Monad, were sown from early August to late October to determine the yield response to sowing date.
- Yield reductions for Kohika of 0.35 t/ha were measured for each week that sowing was delayed.
- Similarly, yield reductions for Monad were 0.225 t/ha/week for each week of delay.
- Grains per plant, thousand grain weight and test weight all declined as sowing was delayed.
- These results suggest that growers should attempt to sow spring wheats as early as possible.