Jump to Main Content
Planting Date Effects on Cotton Lint Yield and Fiber Quality in the U.S. Southern High Plains
- Mauget, Steven, Ulloa, Mauricio, Dever, Jane
- Agriculture 2019 v.9 no.4
- cold, cultivars, genetics, germination, growing season, heat sums, irrigation, lint cotton, lint yield, micronaire, planting date, temperature, variety trials, vigor, High Plains (United States)
- Cotton planting date effects in the U.S. Southern High Plains (SHP) were evaluated based on 11 years of May-planted and June-planted irrigated variety trials. Multiple cultivars planted in each year’s trial allowed for the calculation of 153 yield effects and 162 effects in 5 fiber quality parameters. Yield and quality effects were considered in the context of related changes in total growing season degree days (GDD<inf>S</inf>) and total cool hours (CHRS) during a boll formation period 80 to 110 days after planting. May planting increased GDD<inf>S</inf> and significantly increased yields in 8 of 10 years that comparisons could be made. Micronaire and fiber elongation were the most sensitive quality parameters to planting date. June planting resulted in increased CHRS every year and a significantly higher incidence of low micronaire in 7 of 11 years. In 7 of 11 years May planting significantly reduced fiber elongation relative to June planting. Analysis of SHP temperature data show that late-April to early-May planting dates may increase yield and micronaire by maximizing GDD<inf>S</inf> and minimizing CHRS. Although this practice may be optimal to the SHP environment it may also require high-vigor seed and pre-planting irrigation. Adapting genetics to an early planting strategy might include selecting for improved seed vigor and cold germination with acceptable yield and fiber quality traits.