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Single and multiple applications of Pix® (mepiquat chloride) were applied to 'Stoneville 825' cotton planted 6 May or 26 May 1985 and 6 May or 16 May 1986. Four consecutive applications of either 6.2 g ai ha-1 or 12.3 g ai ha-1 were made at 7 to 10 day intervals beginning at 6 to 7 true leaves and continuing to early bloom. Other treatments included an application of 25 g ai ha-1 at early bloom followed by 25 g ai ha-1 two weeks later and single applications of either 25 g ai ha-1 or 50 g ai ha-1 at early bloom. An untreated control was also included. Early-planted cotton matured earlier and yielded more than late-planted cotton. In 1985 lint yield of early-planted cotton was increased by all Pix® treatments. A single application of Pix® at 50 g ai ha-1 produced the highest yields at both planting dates and was the only treatment to increase lint yield of cotton planted on 26 May 1985. However, Pix® did not significantly influence yields in 1986. Plant height was significantly reduced by all Pix® treatments at both planting dates in 1985 and 1986. Untreated control plots planted 26 May were 28 percent taller than their early-planted counterparts. Height differences due to date of planting were much less in 1986. Lint from early-planted Pie-treated cotton in 1985 was one full grade higher than the untreated control, but lint quality of cotton planted 26 May was not influenced by Pix® In 1985 late planting reduced micronaire values of 'Stoneville 825' from 4.5 to 4.1 and boll weights from 6.73 to 5.94 g boll-1. Neither Pix® nor planting date influenced lint percentage or seed index in 1985, but Pix® reduced gin turnout in 1986. |
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©National Cotton Council, Memphis TN |
Document last modified Sunday, Dec 6 1998
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