Intra- and interspecific interference between sweet corn (Zea mays L.) and a living mulch of white clover (Trifolium repens L.) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n870zt584

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  • Living mulches are vegetative covers that can grow in association with row crops and may prevent soil erosion and suppress weeds. Crop reduction from association with the living mulch is a frequent problem with this cultural practice. The interference between a white clover (Trifolium repens L. "New Zealand") living mulch and sweet corn (Zea mays L. "Golden Jubilee") was studied using an established clover sward, that was mowed and then sprayed with 1 to 1.5 kg al/ha of atrazine [6_chloro__ethyl--(1-methylethyl) 1,3,5,triazine-2,4-diamine]. Corn, at different densities and planting arrangements, was planted into a 10-to 15-cm-wide band tilled in the clover. Replacement-series experiments and systematic density experiments also were conducted in this study. The experiments were irrigated. Interference by clover reduced corn yields. However, when corn row width was reduced from 76 cm to 38 cm, intraspecific interference among corn plants was reduced, and corn plants became more productive and clover suppressive. Corn and clover competed for the same resources (mainly for light) when grown in mixture for 35 days after corn emergence. Clover appeared to be the superior competitor. However, the two species partially avoided competition. Nitrogen concentration in corn tissue (48 days after planting) was reduced when the corn was grown with clover, whereas the concentrations of P, K,and S were not altered by the presence of the legume. Twenty-four days after spraying clover with atrazine, up to 3]. kg N/ha had been released into the soil from the clover. Thirty-four days later, the N concentration in soil of sprayed and unsprayed plots was the same. Soil moisture (20 cm depth) was not affected by the presence of the clover mulch.
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-03-18T14:25:18Z (GMT) No. of bitstreams: 1 Fischer_Albert_J_1989.pdf: 668249 bytes, checksum: 0f584c294dcbd495d9f49eec68fb045f (MD5)
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