|Krenzer, Jr, Eugene|
Submitted to: Oklahoma Academy of Science Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 12/1/2000
Publication Date: 2/1/2001
Citation: CLIFFORD, V.A., MACKOWN, C.T., CARVER, B.F., KRENZER, E.G. DUAL-PURPOSE AND GRAIN-ONLY MANAGEMENT SYSTEM EFFECTS ON SHOOT AND N USE TRAITS OF WHEAT AT ANTHESIS. OKLAHOMA ACADEMY OF SCIENCE PROCEEDINGS. 2001. v. 80: Abstract p. 149. Interpretive Summary: Abstract Only.
Technical Abstract: Growing winter wheat (Triticum aestivum L.) as a dual-purpose crop for both forage and grain is an important management tool for many producers in the Southern Great Plains that offers economic advantages not enjoyed by producers relying on wheat solely for forage or a grain crop. While much more is known about management effects of dual-purpose wheat on grain yield, documentation of the impacts of grazing on many physiological trait of wheat that could affect yield and grain quality are unknown. Experiments conducted at the Oklahoma State University Wheat Pasture Center near Marshall (1998-2000) compared anthesis shoot and N use responses of wheat grown either as a dual-purpose crop or for grain only. A range of wheat cultivars that varied in plant height and yield potential was used. Averaged across wheat cultivars, flag leaf weights from the dual-purpose system were 24 to 31% less with N concentrations up to 15% less than in flag leaves from the grain only system. In one of two years, shoots collected from 1 m of row of dual-purpose wheat weighed 24% less than that of the grain only system and accumulated 28% less N. These traits were not significantly different (P < 0.05) in the second year. In year 2000, single culms of dual-purpose wheat at anthesis had spikes with 25% less dry weight and 5.9% lower N concentration and a total culm dry weight 9.3% less and N content 23% less than culms of grain-only wheat. These results demonstrate that several traits of wheat that are linked to grain filling and N accumulation can be adversely affected by the dual-purpose management system, but the magnitude and occurrence of these effects depends on environmental factors.