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Effect of Wide Plant Spacing on Six Cultivars of Upland Cotton¹

Six Gossypium hirsutum L. cultivars were compared under conditions of wide (40 cm) and normal (10 to 12 cm) spacing between plants, with 1 m between rows. Plant spacing had no significant effect on boll weight, boll retention, fiber length uniformity, or fiber strength or fineness. Lint percent was increased and fiber length was decreased by wide spacing, but there were no cultivar x spacing interactions for these traits. Lint and seed cotton yields, boll number, and flower number (per unit area) were usually decreased by wide spacing, but significant cultivar x spacing interactions were detected for these traits. ‘Acala 1517C’ and ‘Del Cerro’ were affected more strikingly than the other cultivars by plant spacing, probably because of their pyramidal plant-type and short fruiting branches. The relative performance of genotypes for lint yield and associated traits, when evaluated under wide spacing, may therefore not be valid for more closely spaced plantings.

Key Words: Gossypium hirsutum • Cultivar x spacing interaction • Lint yield • Fiber quality

² Associate Professor and former Graduate Student (present address: Division of Floriculture, Volcani Center), Department of Field and Vegetable Crops, Faculty of Agriculture; and Research Agronomist, Division of Industrial Crops, Volcani Center.

Received for publication August 15, 1973.