Graduate Thesis Or Dissertation

 

Beans, cabbage, and sugar beets in a chemically suppressed sod of Manhattan II perennial ryegrass Public Deposited

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  • Crops were planted into tilled strips in an established perennial ryegrass (Lolium perenne L. 'Manhattan II'), sod covering various portions (55%, 66%, 77%) of the row width. Italian beans (Phaseolus vulgaris L. 'Romano II') biomass and yields showed a trend among sod strips with lower yields produced in plots with a greater proportion of the row width covered with sod. Sethoxydim and fluazifop did not suppress grass effectively when 1 cm tall grass was not growing vigorously. In a similar trial with green beans (Phaseolus vulgaris L. 'Oregon 43') there were no yield trends between sod strip width and crop yield. Biomass and pod yields in plots receiving sod suppression treatments were similar to the monoculture check. Sub-lethal rates of the two herbicides applied after grass had grown vigorously for one month suppressed grass effectively. Cabbage (Brassica oleracea L. 'Market Prize') head yields in sod culture plots were significantly lower than monoculture plots regardless of suppression rate and sod strip width. Mid-September chemical treatments did not suppress grass through the fall and dense sod growth over the winter interfered with sugar beet (Beta vulgaris L. 'Beta') grown as a seed crop.
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