Hospital, Costa Rica
1. Plántulas de café de la variedad "Villalobos" responden positivamente la aplicación de ácido giberélico. 2. Hubo diferencia significativa entre los tratamientos la respuesta positiva a la dosificación de ácido usada, muy evidente en la altura de las plantas, no se manifiesta claramente en cuanto al diámetro de los tallos. 3. En lo referente al número de hojas por planta no se obtuvieron diferencias significativas. 4. Se observó un crecimiento excesivo en las plantas que recibieron 40 y 5 μg. de AG junto con su desarrollo anormal que se tradujo en hojas mucho más angostas que las de los testigos.
1. Coffea arabica seedlings were given one application of gibberellic acid; two months later, a positive response was observed. 2. The application of gibberellic acid resulted in plant height differences significant at the 1% level. Increasing concentrations of gibberellic acid resulted in a linear increase in height. Stem diameters did not appear to be affected by the treatment. 3. Further applications of the same concentrations of gibberellic acid were made on two lots of the test plants at monthly and bimonthly intervals. Seedlings receiving monthly applications showed better growth than those given bimonthly applications, the least growth being shown by the controls. 4. Differences in the number of leaves on the treated plants were not statistically significant. 5. Plants receiving 40 and 50 μg of gibberellic acid at each monthly application grew excessively, developíng abnormally narrow leaves.
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