effect of mid-season potassium on yield and fiber quality of modern cotton varieties in Southeast Missouri.
(S04-dunn743254-oral)
Authors:
D.J. Dunn* - Univ. of Missouri-Delta Center W.E. Stevens - Univ. of Missouri-Delta Center B. Phipps - Univ. of Missouri-Delta Center A. Phillips - Univ. of Missouri-Delta Center
Abstract:
Eight modern cotton varieties were evaluated for yield and fiber quality response to two pre-plant soil and three mid-season foliar potassium treatments. In 2001 no significant differences were found among the K treatments for yields or fiber quality. In 2002 there were significant differences found among the treatments for yield and all fiber properties. There was also a significant interaction between treatment and variety for yield and fiber quality in 2002. The lint yield differences, while significant (LSD = 48 kg/ha), were erratic among K treatments. The greatest numerical yield was for the 0 kgha-1 K
pre-plant + two foliar K sprays (1169 kg/ha). The 28 kg/ha K pre-plant + two foliar K sprays was the lowest yielding treatment (1114 kg/ha). The fiber properties, micronaire and trash content, were significantly affected by K treatment. Both generally increased as applied K increased. Micronaire and trash content were significantly greater for treatments receiving pre-plant K. This indicates a delay in maturity with increasing K rates. Fiber strength was generally decreased by K applications. The
strongest fibers were from the untreated check (32.23 g/tex) while the weakest were from the pre-plant K + one foliar spray treatment (31.53 g/tex). The differences found in fiber properties were not great enough to affect returns to producers in 2002.
Speaker Information: David Dunn, Univ. of Missouri-Delta Center, Uinversity of Missouri-Delta Center P.O. Box 160, Portageville, MO 63.873; Phone: 573-379-5431; E-mail: [email protected]
Session Information: Wednesday, November 5, 2003, 8:10 AM-9:25 AM Presentation Start: 8:45 AM