Abstract
Abstract Growth of 2-year-old tart cherry (Prunus cerasus L.) trees as measured by trunk circumference increase or total shoot elongation was significantly greater in plots receiving chemical or mechanical weed control within the tree row than in plots receiving between-row cultivation only. Shoot growth of one-year-old apple (Malus domestica Borkh. ‘Delicious’) trees responded similarly to weed control. Tart cherry trees in hand weeded and dinoseb or glyphosate treated plots had greater growth than those in paraquat treated plots. Tart cherry trees in plots receiving chemical or mechanical weed control out-yielded trees in unweeded plots during the first year of production. ‘Delicious’ apple trees in plots treated with dinoseb (6.7 and 10.1 kg/ha), the high rate of glyphosate (1.7 kg/ha), or mechanical weed control also outyielded trees in unweeded plots during the first year of production. Effects of weed control on growth and yield were less distinct during the 2nd year of production. Trees from treated plots came into production one year earlier than trees in the unweeded plots. Chemical names used: 2-(1-methylpropyl)-4,6-dinitrophenol (dinoseb); N-(phosphonomethyl)glycine (glyphosate); 1,1′-dimethyl-4,4′-bipyridinium ion (paraquat).
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