Coffee Board of Kenya Monthly Bulletins March 1972

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Date
1974
Authors
Mitchell, H. W.
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Abstract
Seven herbicide spray programmes, without cultivation, were compared with hand weeding over a four year period at the Coffee Research Station, Ruiru. The treatments had no significant effect on coffee yield or quality. The most effective weed control was obtained with a mixture of diuron + paraquat (Karmex + Gramoxone) applied twice a year followed by spot application of paraquat as required. The cost of this treatment was similar to that of hand weeding. Three treatments using paraquat alone were cheaper and less effective, especially against perennial grasses and Cyperaceae. Simazine was effective when applied with paraquat but not with amitrole. Diuron + amitrole gave good weed control but the cost was high.
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