Sweet corn (Zea mays) production in a white clover (Trifolium repens) living mulch : the second year Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tq57nv138

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  • Soil-related problems common to Oregon farmers are erosion, compaction, organic matter depletion, and nutrient loss. High costs of fertilizer, fuel, and weed control are additional management problems. Growing a secondary crop as a living mulch with a primary crop may ease some of these problems. Sweet corn production in Oregon is commonly plagued by these problems and may be suitable for a living mulch system. Field experiments were begun to test the feasibility of growing sweet corn (Zea mays L. 'Jubilee') and white clover (Trifolium repens L. 'New Zealand') living mulch in the Willamette Valley in Oregon. Research was done at the Oregon State University Hyslop and Horticulture research farms near Corvallis. Management practices tested were fall-planted clover (1982) compared to spring-planted clover (1983), and clover suppression treatments in 1984. Suppression treatments were 0.84 and 1.4 kg ai/ha atrazine (6-chloroN- ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine), and mowing. Corn yields were not reduced when clover was planted in the fall and suppressed with atrazine at 1.4 kg ai/ha. When clover suppression treatments were mowing or 0.84 kg ai/ha of atrazine, corn yields were reduced. At the Horticulture farm, an additional screening trial was conducted to determine the effect of selected herbicides on second-year white clover. Results indicated that the dimethylamine 2,4-D ((2,4- dichlorophenoxy) acetic acid) applied at 2.24 kg ae/ha gave excellent initial and residual suppression of the clover (95% at 14 days after treatment and 82.5% at 67 days after treatment). A mixture of atrazine plus alachlor (2-chloro-N-(2,6-diethylphenyl-N- (methoxymethyl)acetamide) applied at 1.4 and 3.36 kg ai/ha, respectively, effectively suppressed the clover (80%), but was only slightly more severe than atrazine at 1.4 kg ai/ha.
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