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Skip-row Planting of Pima Cotton¹

Growers have been planting American Pima cotton (Gossypium barbadense L.) in skip-row patterns without supportive research data on skip-row effects on yield and quality of Pima cotton. The purpose of this research was to obtain such data on skip-row planting for Pima cotton. Pima cotton was grown under irrigation in five skip-row patterns in randomized blocks in each of 5 years. All skip-row patterns increased lint yields on a planted-area basis as compared to solid planted. Skipping single rows increased lint yield of a two-row strip 20%. Skipping two rows increased lint yield an additional 8%. In plant-6-skip-2 pattern, lint yield of outside rows was increased 28% over that of the center two rows. The second rows from the outside had 5% increase in lint yield. A tall cultivar benefited more from skip-row than did a short cultivar. Skip-row effect on outside rows was greater during years of high lint yield than during years of low yield (r = 0.90). In these tests the skip-row yield increases were about 60% of those reported on Upland cotton (G. hirsutum L.). Outside rows and single rows had lower gin turn-out, more trash in lint, and slightly higher lint percent. Skip-row patterns had no effect on fiber quality.

Key Words: Gossypium barbadense L. • Fiber quality

² Research agronomist, ARS-USDA.

Received for publication November 3, 1974.