Fluxo de seiva e evapotranspiração do maracujazeiro sob diferentes tipos de propagação

Abstract

The more accurate quantification of water consumption by plants requires improved methodologies, simple evaluation techniques and models that express well the water dynamics in the system. Therefore, the present work aims to evaluate the heat ratio method for passion fruit crop. The study was conducted with the cultivar BRS GA1 grown in an agricultural greenhouse, in the experimental area of the Water and Soil Engineering Center, Federal University of Recôncavo da Bahia, Cruz das Almas-BA. The irrigation method used was two-day drip irrigation. The monitored variables were: sap flow; soil moisture; and reference evapotranspiration. The sap flow was continuously monitored by the heat ratio method, which is an improved technique where heat is used as a sap marker. Soil moisture was monitored by TDR sensors installed 0.25m away from the plant stem and 0.10, 0.20, 0.30 and 0.40m deep. Meteorological variables were obtained from the station installed within the experimental area, which provided radiation, maximum, minimum and mean temperature and relative humidity data. The obtained data were related seeking to establish indices that allowed to quantify the consumption and the water status of the passion fruit.