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Title: NITROGEN USE AND BIOMASS DISTRIBUTION OF WINTER WHEAT POPULATIONS SELECTED FROM GRAIN-ONLY AND DUAL-PURPOSE SYSTEMS

Author
item Mackown, Charles
item CARVER, BRETT - OSU, PLANT&SOIL SCI.

Submitted to: Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 9/2/2004
Publication Date: 11/1/2004
Citation: Mackown, C.T., Carver, B.F. 2004. Nitrogen use and biomass distribution of winter wheat populations selected from grain-only and dual-purpose systems [abstract]. Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting. Paper No. 5811.

Interpretive Summary: ABSTRACT ONLY

Technical Abstract: Southern Great Plains producers grow winter wheat (Triticum aestivum L.) primarily as either a grain-only (GO) or a dual-purpose (DP, grazing plus grain) crop. Traditionally, cultivars used for both production systems are developed in a GO system. Because DP grown wheat may forfeit gains in grain yield accrued for GO-developed cultivars, we evaluated N and biomass traits for 12 sets of sub-populations (each set a unique pedigree) to test benefits of making selections from a DP system. Sets came from F2 sources and contained a base (B) F3 bulk population and F5 bulk populations mass selected from the F2 within GO and DP systems. The 12 sets of sub-populations were evaluated in GO and DP systems in 2001-02 and 2002-03. At anthesis, main effects (year, system, pedigree, selection environment) were significant for culm dry wt. and N, and flag leaf dry wt. Among selections, differences for these traits were small (2.0-3.5%) with no difference between GO and DP selections which were slightly less than the B selection, while differences among pedigrees were large (21-30%). At maturity, differences (7.6-20%) for culm, grain and kernel dry wt., HI, N uptake, grain N, and NHI occurred among pedigrees, while differences among selections were smaller (1.4-4.5%) and significant for only culm, grain and kernel dry wt., and N uptake. Selections made from the DP environment performed similar to those from the GO environment when grown in either production system.