Coffee Board of Kenya Monthly Bulletins December 1977

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Date
1977
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Foliar sprays of gibberellic acid (GA.a) at 100 ppm were applied to mature trees three times during the rainy season between March-May, 1974 and February-April or March-May, 1975,at various altitude sites.The treatment increased yield of the following year's crop by 12-26% from the 1974 sprays.The 1975 applications increased yield of the 1976 crop by 8-69% at some sites but reduced yield by 5-22% at other sites.Size,liquor and appearance of beans was not affected.GA,3 at 25, 50 and 100 ppm applied two to four times to whole trees bearing 4 to 10 week old fruits increased bean dry weight by 6-10%,grade 'A' beans by 13-23%,and overall quality standard slightly.It has been suggested that the source of variability In Yield response to gibberellic acid has to be worked out before a recommendation on the use of this chemical can be made.
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Monthly Bulletin, 42 (501)
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