Abstract
Abstract The effect on grain yield of changing the plant population in 76 cm rows was studied over 3 years. Grain yields for the full season hybrid p×610 were maximised around 14 t/ha in the range of 80–90 000 plants/ha but the response curves gave no indication of any marked changes over the range of 70–100 000 plants/ha. These plant populations are above those recommended for full season hybrids overseas. The optImal plant population in these trials was similar to the optima in lower yielding New Zealand trials.In contrast, overseas results suggest that the optimal population would be higher in higher yielding trials.Plant lodging was severe only in the crop following pasture and here it rose as plant population increased.It is recommended that crops be established to give harvest populations of 80–90 000 plants/ha except for crops immediately following pasture when populations of 70–80 000 plants/ha should be established.
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