ISSN:
1435-0653
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Poa pratensis L.) seed fields was essentially eliminated in Washington in 1998, and may be banned in Idaho and Oregon because of health concerns. Regulations banning burning necessitated exploring non-thermal residue management. Seed and vegetative responses of six Kentucky bluegrass cultivars to three post-harvest residue removal methods, and three timings of fall applied N in second- and third-year seed crops were evaluated. Residue removal methods were burn, vacuum, and rake. Split fall timings of N applications were 70% September, 30% October; 30% September, 70% October; and 100% October. Post-harvest residue management did not significantly influence second-year seed crop yields; however, with mechanical residue removal, third-year seed crop yields of 'Glade', 'Huntsville', and 'South Dakota' were 42 to 62% of seed yields with open-field burning. Seed yield of 'Baron', 'Limousine', and 'Georgetown' was not affected by residue management in the third-year seed crop. As larger portions of N were October applied, second-year seed yields of Georgetown and Huntsville were higher. Third-year seed crop yields were not influenced by timing N application. Overall, seed production was correlated with panicle number (r = 0.77**), but not with above ground biomass, rhizome biomass, or weight per 100 seeds. These data suggest that seed yield of relatively short-statured, small-seeded cultivars producing modest amounts of above ground biomass may be sustained by mechanical residue removal through three seed crop years when 70 or 100% the N is applied in October.
Type of Medium:
Electronic Resource
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