ISSN: 1659-2751



Design of a Greenhouse for the Humid Tropic Conditions of Costa Rica


In countries with cold and temperate climates, the production in greenhouses has been a great success. For tropical countries the technology needs to be adapted to the existing socio-economic and climatic conditions. The main objective of this research was to evaluate a greenhouse designed for the prevailing humid tropic conditions in Guácimo. Costa Rica. An 80 m2 “inverted T” type greenhouse was built. Lettuce (Lactuca sativa var. capitataL.) plants were grown under three different treatments within the greenhouse: (T1) closed greenhouse, (T2) with air outlet and (T3) with water capture and injection. T1 presented the highest average temperature inside the greenhouse 39.1 ºC taken at 12:00 noon. At this hour T2 and T3 did not present significantly different temperatures, 33.3 °C and 34.9 ºC, respectively). Duncan’s multiple range test revealed that there were significant, statistical differences (p<0.05) amongst the variables of size and weight, evaluated for the lettuce plants. Elevated temperatures, however, limited the adequate development of the lettuce plantlets.

Key words: Greenhouse, humid tropics, lettuce, capture, injection, temperature.

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