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Yield Response of Upland Cotton (Gossypium hirsutum L.) to Several Spacing Arrangements¹

A 3-year study with Upland cotton (Gossypium hirsutum L.) was conducted at Experiment, Ga., to determine the effects of plants/hill, within-row hill spacings, and plant populations on lint yield.

Highest yields were obtained when the populations were within a range of 96,000 to 144,000 plants/ha. below this population range yield decreased sharply; above this population range yield was reduced but the rate of decline was more gradual than the decline in the low population range. The highest average yield (919 kg lint/ha) was obtained from five plants/hill spaced 40 cm apart (120,412 plants/ha). When all hill spacings were combined, the mean yield from five plants/hill (879 kg/ha) was significantly (P : .05) higher than yield from two plants/hill (812 kg/ha). Yield differences among hill populations of three, four, or five plants were not significant. Whenth e plants/hill treatments were combined, yields from plants spaced 20 and 40 cm apart were significantly higher (P = .01) than yield from plants spaced 60 cm apart. The plants/hill x hill spacings interaction was not significant.

Key Words: Platn population • Plants/ha • Plants/hill • Hill spacing

² Research Agronomists, Crops Research Division, Agricultural Research Service. U. S. Department of Agriculture, Georgia Station, Experiment, Georgia 80212.

Received for publication January 19, 1970.

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