Estimación del uso del agua en el cultivo de cebolla (allium cepa l.) En las condiciones de Quíbor, estado lara, venezuela

under conditions of the onion production system, in quíbor lara state, venezuela, estimates were made of total water consumption. the study was carried out during two cycles of growth for the cultivars texas grano 438 and utopia, taking into consideration the evapotranspiration by the onion crop and the free evaporation of the water in the furrows. the evapotranspiration was estimated using the original penman-monteith method, which allows for the direct calculation of this value without using the crop coefficient. in the first season (april-july), the total value of water for the onions ranged about 450 mm per cycle for both cultivars, while the daily values ranged between 3.2 and 5.7 mm. in the second season (july-november) the use of water was lower. the daily consumption of water was always lower in the initial and final stages of the crop. the free evaporation of water directly from the furrow always exceeded the crop et.