Irrigation coefficients of turfgrass (Stenotaphrum secundatum) in arid conditions, under water stress using subsurface drip irrigation

The research work had the objective to obtain the irrigation coefficients of Saint Augustine turfgrass, were evaluated 1.0; 0.8; 0.6 and 0.4 of the potential evapotranspiration for each season during the year. Climatic variables were monitored by an automatic station and sub-surface drip irrigation was used, no intrusion of the roots into the irrigation hoses and drips. To monitor the moisture distribution, TDR sensors were used, a uniformity coefficient between 90 and 92% was obtained. Moisture monitoring during the time and energy status were used FDR sensors and pF curves. Visual quality was evaluated through color, uniformity and coverage, the last one supported by digital images. Different irrigation coefficients were presented for each season. Finally, the coefficients that allowed keeping the turfgrass with low water requirement and maintenance were selected, as well as a good visual quality by applying the Hierarchical Analysis Process, the coefficients selected were: 0.8; 0.8; 0.4 and 0.6 of the ETo for the summer, autumn, winter and spring respectively, obtaining an adequate visual quality and a water volume saving of 31%.