The effect of planting date on the yield and some fibre properties of cotton in the Namoi Valley

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Abstract
Two cotton cultivars were planted during Sept. 30-Nov. 30, and studied over 3 seasons. The yield of the commercial cultivar (''Deltapine Smoothleaf'') fell by an average of 20 kg ha-1 day-1 delay in planting after Oct. 20, earlier planting dates having equal yields, producing a plateau effect. The yield of an early maturing cultivar (''Short Sympodial'') fell linearly by 11 kg ha-1 day-1 delay in planting. Planting dates after mid-Oct. had an adverse effect on micronaire in the commercial cultivar, but lint length and strength were not affected. Maximum yield and micronaire for plantings after mid-Oct. came from the early cultivar. Tolerance to low temperature is an important factor in cultivar earliness and accounts for the performance of ''Short Sympodial'' in these experiments. The number of days from 1st flower to 1st frost was as reliable as growing degree days in explaining yield variation within a cultivar.

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