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Effect of gibberellic acid on yield of Arabica Coffee in Kenya

by Opile, W.R.
Publisher: Dic 1977Subject(s): COFFEA ARABICA | ACIDO GIBERELICO | APLICACION FOLIAR | RENDIMIENTO | KENIA | COFFEA ARABICA | GIBBERELLIC ACID | FOLIAR APPLICATION | YIELDS | KENYA | COFFEA ARABICA | ACIDE GIBBERELLIQUE | APPLICATION FOLIAIRE | RENDEMENT | KENYA In: Kenya Coffee (Kenia) v. 42(501) p. 395-403Summary: Foliar sprays of three gibberellic acid (GA3) at 100 ppm were applied to mature trees 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. GA3 at 25, 50 and 100 ppm applied two to four times to whole trees 4 to 10 week-old fruits increased bean dry weight by 6-10 grade A beans by 13-23 and overall quality standerd slighty. 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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++9 ref. Sum. (En)

Foliar sprays of three gibberellic acid (GA3) at 100 ppm were applied to mature trees 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. GA3 at 25, 50 and 100 ppm applied two to four times to whole trees 4 to 10 week-old fruits increased bean dry weight by 6-10 grade A beans by 13-23 and overall quality standerd slighty. 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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