The Coffee Board of Kenya Monthly Bulletin June 1990

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1990
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Various chemical and mechanical weed control methods were compared,to find the most suitable method for a wet humid area in Kenya.The trial was set up at Coffee Research Sub-station - Koru in 1985.The treatments had significant effects on clean coffee yields but not on percentage grade 'A' beans.'The most effective weed control was achieved by glyphosate (36% a i) treatments (97 .5% control),but the costs were very high.Repeated use of paraquat (gramoxone) (20% ML a i) in combination with 'Linuron (50% WP) had good weed control (95%) and net benefits (K£4256/ha/year),but was less effective on grasses and nutgrass.However,the treatment involving g paraquat/linuron, paraquat alone, paraquat/forking/ and slashing and slashing/forking were the weed control methods with the highest marginal rate of return in that order. For an efficient weed management integrated weed control is recommended.In this situation weeds depressed clean coffee yields by over 52% in the un-weeded coffee.
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Bulletin, 55 (644), pp. 853-872
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