Graduate Thesis Or Dissertation
 

Weed suppression in vegetables with residues of 'micah' barley (Horedeum vulgare L.) and other spring cereals

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  • Three experiments whose objectives were to investigate cover crop kill by winter freeze, weed suppression by 'Micah' barley and other spring cereals, and allelopathic potential of cereal covers were conducted at the Vegetable Research Farm and in the greenhouse and growth chamber facilities at OSU in 1989/90. Kill by winter freeze failed under the warm winter of Corvallis in 1989/90. Complementary usage of herbicides and residues for weed control is suggested. Residues of herbicide killed 'Micah' barley suppressed (79-88%) weed emergence and growth for up to six weeks in tomatoes, lettuce and cucumber. Allelopathy, besides physical effects of the mulch, contributed to weed control in the system. Greenhouse and growth chamber bioassay studies confirmed the presence of seed germination inhibitors in residues of 'Micah' barley and other covers. No differences in yield among treatments were observed for each crop when weeds were controlled six weeks after planting.
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Déclaration de droits
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