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Seeding Rate for Dryland Cotton in the Texas Rolling Plains

Manilal Choudhary and D.G. Bordovsky


ABSTRACT

A 2x4 factorial experiment using a split-plot design was conducted in 2001 at Munday, TX on Miles fine sandy loam soil. The objective was to determine the effect of seeding rate on dryland cotton (Gossypium hirsutum L.) production parameters. Two varieties, PM 2326 BG/RR and PM 2280 BG/RR, were the main plots and seeding rates of 1, 2, 4, and 6 seeds/ft of row were subplot treatments. Seeds were planted on the center of raised beds listed 40 inches apart. Treatments were replicated 6 times. Seed cost ranged from $ 7/ac for 1 seed/ft to $ 43/ac for 6 seeds/ft. Increasing seeding rate resulted in decreased plant height, total nodes per plant, bolls/plant, and percent first position boll retention. In contrast, node height of the first fruiting branch and percent barren plants increased with increasing seeding rate. Height to node ratio and bolls/ft were not affected by seeding rate. Cotton bur yield was higher with lower seeding rates than with higher seeding rates. Variety PM 2326 BG/RR was taller, had greater height to node ratio, and higher bur cotton yield as compared to PM 2280 BG/RR. Year 2001 data shows that using a reduced seeding rate may lower production costs.





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Document last modified May 20, 2002