Evaluation of evaporation-measuring equipments for estimating evapotranspiration within a greenhouse

Avaliação de equipamentos de medida da evaporação para estimativa da evapotranspiração dentro de um ambiente protegido

Abstracts

With the objective of evaluating the performance of simple evaporation measuring equipments in estimating the evapotranspiration in greenhouse, an experiment was conducted in Piracicaba, SP, during a tomato-growing season. Daily water evaporation rate from Piche atmometer, modified atmometer and a reduced evaporation pan installed inside the greenhouse and a Class A pan installed outside were compared to the evapotranspiration rates calculated with Penman-Monteith equation. Results showed that atmometers had the best performance in estimating the crop evapotranspiration in greenhouse and could be used advantageously in relation to the evaporation pans.

Piche atmometer; evaporation pan; tomato; Penman-Monteith