ISHS Acta Horticulturae 424: II International Rose Symposium
IRRIGATION MANAGEMENT BASED ON WATER CONSUMPTION, FOR GREENHOUSE ROSES GROWING ON TERRACE SOILS IN THE CANARY ISLANDS |
| Authors: | R. Munoz-Carpena, A.R. Socorro-Monzon, P. Mansito, J. Trujillo |
| Abstract:
The application of the water content vs. suction curves leads to a water management and monitoring scheme for two lysimeters growing roses, cvs. Ilseta and Jaguar under a natural-ventilation greenhouse. The soil physical properties were obtained at three depths in each of the lysimeters and a battery of tensiometers installed to monitor soil suction values. Drip irrigation was applied whenever the average suction at 10 cm reached 10 cbar, and drainage quantity was recorded. A water balance model was developed to predict evapotranspiration and drainage outflow. Crop coefficients were obtained by calculating Penman-Monteith potential evapotranspiration values inside the greenhouse. A correlation of water uptake values with outdoor radiation measurements was made in order to automate the irrigation system. Results show a good correlation between mean monthly ET vs. outdoor radiation values (r=0.63–0.88) but poor correlation between daily ET values and outdoor radiation (r=0.22–0.35), which indicates that radiation alone might not be a good irrigation criteria for greenhouses in the area, particularly those with little environmental control. | |
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