Abstract

ZAPATA ARANGO, Piedad Cecilia; ANDRADE CASTANEDA, Hernán Jair  and  NIETO ABRIL, Zaira Katerine. ECOPHYSIOLOGY PERFORMANCE OF COFFEE (Coffea arabica L.) CV. CASTILLO IN AGROFORESTRY SYSTEMS IN TIBACUY, CUNDINAMARCA. rev.udcaactual.divulg.cient. [online]. 2017, vol.20, n.1, pp.61-70. ISSN 0123-4226.

Coffee crops under full sun and different tree covers and plantain (Musa AAB) are located in Tibacuy, Cundinamarca, Colombia; however, no studies about interactions between canopy layer and the crop have been carried out. This research is focused in evaluating the ecophysiological performance of coffee bushes cv. Castillo in agroforestry systems (AFS) under three conditions of tree and plantain (Musa AAB) shade: low shade, 0-20%, medium shade, 21-47% and high shade, 48-70%. Five farms by type of shade with coffee plantations in production, aged between 4 and 6 years were selected. In each place, a sampling plot of 1000m² was established in which three recordings were taken in 2015: rainy season, January, transition period, June, and dry season, July. In each sampling plot, three representative coffee plants were selected, which were representative and in each plant, three leaves were selected: one by vertical strata: low, medium and high. The incident radiation photosynthetically active (PARi), stomatal conductance, transpiration and net assimilation of CO₂ were measured with a portable photosynthesis system CIRAS 3. The results show that high levels of shade between 48 and 70% negatively affected the photosynthesis rates of coffee plants; whereas with medium levels of shade up to 47% a similar photosynthetic efficiency than plants under full sun was obtained. These results are important inputs to consider in taking decisions for the establishment and management of coffee production systems regarding shade canopy.

Keywords : Net assimilation of CO₂; photosynthetically active radiation; stomatal conductance; transpiration.

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