Farmers in the Southeast are interested in growing cotton (Gossypium hirsutum L.) following a winter cash crop or a legume cover crop. This results in a relatively late planting date. Late planting of cotton is now possible because eradication of the boll weevil in some locations has extended the effective period for boll production. Additionally, modern cotton cultivars are earlier in maturity than those previously available. Our objective was to determine the effect of five planting dates on yield, height, and fiber properties of six cotton cultivars: Coker 130 and DES 119 (early), Coker 320 and PD‐3 (medium), and Deltapine 5415 and Deltapine Acala 90 (late maturing). Cotton was planted in mid‐April, early‐ and mid‐May, and early‐ and mid June in 1991, 1992, and 1993. As planting date was delayed, yields decreased 2 of 3 yr, but were unaffected the third year when drought conditions limited yields. As planting date was delayed, lint percentage declined, plant height increased, fiber strength increased, fiber elongation increased, and micronaire declined. Over all years and planting dates, DES 119, Coker 130, and Deltapine 5415 had the highest yield. Deltapine 5415, a longer maturing cultivar, yielded less than the two other cultivars when planted on the later planting dates. Coker 130 had the highest lint percentage and lowest fiber strength, whereas Deltapine Acala 90, the tallest cultivar, had the lowest lint percentage and highest fiber strength. DES 119 had a lint percentage equal to that of Coker 130, as well as the highest fiber uniformity. Fiber elongation and micronaire were highest for Deltapine 5415 and DES 119. These data indicate cultivar selection is an important consideration when planting at a later than optimum date. Research Question Farmers in the Southeast are interested in growing cotton following winter wheat, canola, or a legume cover crop, thus necessitating a relatively late planting date. Late planting of cotton is now possible because eradication of the boll weevil as an economic pest in some locations has extended the effective period for boll production. Additionally, modem cotton cultivars are earlier in maturity than those previously available. These factors suggest the need to re‐evaluate cotton planting date recommendations. This study evaluated six cotton cultivars planted bimonthly over 60 d to determine the effect of planting date on yield and fiber qualities of cotton grown on the southeastern Coastal Plain. Literature Summary Numerous studies have shown that cotton has an optimal planting date that will produce the highest lint yield for a particular field, and that the best planting date varies each year. Lower yields obtained by planting later than the optimum date were often explained by a reduced growing season length. Delayed planting had various effects on fiber length, whereas late planted cotton has increased fiber strength but decreased fiber fineness. Research results with modem, early‐maturing cultivars are not available. Study Description Six cotton cultivars wer...
No abstract
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.