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Title: FALL FORAGE YIELD AND N COMPOSITION OF WINTER WHEAT POPULATIONS SELECTED FROM GRAIN-ONLY AND DUAL-PURPOSE ENVIRONMENTS

Author
item MACKOWN, CHARLES
item CARVER, BRETT - OK STATE UNIV.
item KRENZER JR., EUGENE - OK STATE UNIV.

Submitted to: Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 8/1/2003
Publication Date: 11/1/2003
Citation: Mackown, C.T., Carver, B.F., Krenzer, E.G. 2003. Fall forage yield and n composition of winter wheat populations selected from grain-only and dual-purpose environments [abstract]. Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting. Paper No. C06-mackown239935-poster.

Interpretive Summary: Abstract Only.

Technical Abstract: Winter Wheat (Triticum aestivum L.) is the foundation of agricultural enterprises in the southern Great Plains and is grown primarily as grain-only (GO) and dual-purpose (DP, forage + grain) crops. Traditionally, cultivars are developed in GO systems. Because of genotype by system interactions, GO derived cultivars may compromise gains for DP production. Forage traits of two nurseries, each with 12 triplicate sets of sub-populations (total of 24 unique pedigrees) were used to test benefits of tailoring breeding programs for DP wheat. Each set came from the same F2 source and contained a non-selected (NS) F3 bulk population and F5 bulk populations selected after the F2 from GO or DP systems. Yield and forage total N and nitrate were measured at the start of fall grazing. Nearly always, the pedigree x selection effect was not significant. Effect of selection system on yields of each nursery was significant at P = 0.09 and 0.07 in 2001 with DP derived populations about 8% greater than those from GO; in 2002 selection effect had P = 0.38 and 0.30. Selection system had a significant effect on total N but not nitrate levels. Total N in GO selections was slightly greater (2.5%, P < 0.05) than those from NS and DP. Forage nitrate was affected by pedigree; mean nitrate-N among the 24 pedigrees ranged from 1.3 to 3.1 mg/g in 2001 and 0.4 to 1.3 mg/g in 2002. The DP selection appears to offer enhanced or equal fall yield without greatly changing forage total N and nitrate.