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

Abstract

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. When the 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 ✕ hill spacings interaction was not significant.

Comparative Growth and Yield of Cotton Planted at Various Densities and Configurations

“…Yield was similar for hill spacings of 20 and 40 cm, but was significantly reduced at 60 cm. Hawkins and Peacock (1970, 1971) also reported higher yields with 20‐ and 40‐cm hill spacing than with plants on 60‐cm hills. Although not significant, yields tend to increase as the number of seeds per hill increased from three to five seeds when hills were spaced at 60 cm (Hawkins and Peacock, 1970).…”

“…Hawkins and Peacock (1970, 1971) also reported higher yields with 20‐ and 40‐cm hill spacing than with plants on 60‐cm hills. Although not significant, yields tend to increase as the number of seeds per hill increased from three to five seeds when hills were spaced at 60 cm (Hawkins and Peacock, 1970). This may explain why 60‐cm hill spacing with four plants per hill was not significantly different from other treatments in the seeding configuration study, but a significant yield reduction did occur with 60‐cm hill spacing with only three plants per hill in the population × seeding configuration study.…”

“…Limited information is available on the effect of intrarow seeding configuration at a given population on growth and development parameters. Hawkins and Peacock (1970) reported that plant population, as long as the stand is of uniform density, may be a more important factor than either spacing or number of plants per hill; and that boll and fiber characteristics were relatively stable across a wide range of planting patterns (Hawkins and Peacock, 1971).…”

Eliminação do desbaste na cultura do algodoeiro

“…Sabe-se que os capulhos dos ponteiros apresentam menores produções e qualidade de fibra inferior e conseqüentemente menores pesos de semente. Resultados semelhantes foram obtidos por Wilkes & Corley (1968), Hawkins & Peacock (1970), Bridge et al (1973) e Ferraz et al (1977, que mostraram efeitos negativos quanto a essas características com o aumento do estande.…”

Espaçamentos ultra-adensado, adensado e convencional com densidade populacional variável em algodoeiro

“…Verificando-se a análise de variância para produção de algodão em caroço na Hawkins & Peacock (1970); Hawkins & Peacock (1973);Lamas (1988);Carmi (1996); Krieg (1996);Gerik et al (1998);Bednarz et al (1999);Gerik et al (1999). Contudo, Atwell et al (1996);Maas (1997);Bednarz et al (1999), obtiveram maior produção utilizando o espaçamento convencional.…”