Kajian Kebutuhan Air Tanaman Selada (Lactuca Sativa L.) Berdasarkan Metode Evapotranspirasi Hargreaves dan Blaney-Criddle

Abstract

Lettuce plants are one of the plant commodities that have a high economic value and moreover interested in various communities because of the development of science and technology becomes many ways used to maximize the cultivation of Lettuce plants as for one of the basic neccesary to maximize the cultivation of Lettuce plants is to know how much the value of water Lettuce plants need and how much the value of evapotranspiration Lettuce plants. This research aims to obtain the value of water requirements of Lettuce plant based on the Hargreaves and Blaney-Criddle evapotranspiration methods. The result show different daily average reference Hargreaves and Blaney-Criddle evapoytranspiration methods had different values each month. The highest value of average Hargreaves evapotranspiraton in March, amounted to 4,76 mm/day, and the smallest in January, amounted to 4,35 mm/day. While, the value of water requirements of Lettuce plant based on the Hargreaves evapotranspiration method 0-15 Days After Planting (HST), average value of ETc is 1,46 mm/day, at 16-30 HST is 4,27 mm/day, and at 31-45 HST is 3,96 mm/day. The highest value of average Blaney-Criddle evapotranspiration in January, amounted to 3,74 mm/day, and the smallest in March, amounted to 3,57 mm/day. While, the value of water requirements of Lettuce plant based on the Blaney-Criddle evapotranspiration method 0-15 HST, average value of ETc is 1,30 mm/day, at 16-30 HST is 3,58 mm/day, and at 31-45 HST is 3,35 mm/day.