A field study was initiated in 1991 to study the effects of variety, plant growth regulator, and row spacing on cotton production. Of particular interest was the effect of these factors on yield, earliness, and fiber quality. The study included seven varieties to provide a range of genetic characteristics, application of 16-20 cz/a of Pix Vs no Pix, and production in both 30-inch and 40-inch rows. Plots were 6 rows in width and 108 ft in length with 6 replications.

In 1992, the application of 16 oz/a of Pix significantly increased yield in 30-inch rows but had no effect on yield in 40-inch rows. The 30-inch Pix treatments averaged 1192 lb/a of lint compared to 1061 lb/a for the none Pixed 30-inch rows and 1064 lb/a for the 40-inch rows. A significant variety X row spacing interaction occurred. Varieties responding favorably to the 30-inch row spacing were DES-119 (9.3%), MD-51ne (5.2%), STV-6413 and okra leaf 24-8 (26.4%). Varieties that did not increase yield in 30-inch rows were DPL-5415, DPL5690, and STV-453. Grade index was slightly lower for the 30-inch rows (95.9 vs 98.3) but different harvesters were used to harvest the two row spacings and a machine factor was possible. Grade was significantly higher for Okra-24-8, DPL-5415, and DPL-5690 compared to the other four varieties. The only two varieties indicated any earliness due to 30-inch rows were okra-24-8 and STV 453.