Coffee Board of Kenya Monthly Bulletin October 1999

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1999
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The effects of overhead irrigation on yield and quality of Arabica coffee cultivar Ruiru 11 were investigated in a field trial at four irrigation rates (0, 38, 51 and 76 mm) and two intervals (21 and 28 days). The best overall rate x interval combination was 76 mm at 21 days. This resulted in a three year mean clean coffee yield of 2761 kg ha-I yr-I. Bean grade sizes and liquor quality results showed no significant differences between the irrigated treatments. However, irrigation increased the proportion of grade AA beans by 76.4 and decreased that of grade TT beans by 26.5% over the unirrigated coffee. It is concluded that 76 mm of water at 21 days interval may be the optimal dry season overhead irrigation requirement for the cultivar Ruiru 11.
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Bulletin, 64 (756), pp. 2981-2992
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