Mapping of Potential Evapotranspiration Rate in The First Growing Season (Rendengan) In Wajo District Samsuar(1), Husnul Mubarak(1), Nunik Lestari(2)
1Agricultural Engineering Department, Faculty of Agriculture, Universitas Hasanuddin, Makassar. Indonesia
2 Agricultural Technology Education Study Program, Faculty of Engineering, Universitas Negeri Makassar, Makassar, Indonesia
Abstract
The Indonesian government is currently trying to increase the productivity of agricultural land by building irrigation infrastructure. In addition, efforts need to be made to optimize the availability of agricultural water sources which continue to decline. The high rate of water loss in agricultural areas is a new challenge in efforts to increase the productivity of existing land. Calculation of potential evapotranspiration is one of the important factors in calculating plant water requirements. This can be used as a reference in providing irrigation water to agricultural lands in accordance with crop water needs. The main obstacle faced in determining the value of potential evapotranspiration is the very lack of availability of climatological stations which are the source of data in determining the value of potential evapotranspiration. This study aims to obtain an overview of the evapotranspiration potential value in one of Indonesia^s national food barns in Wajo district. The results show that the use of global climatological data provided by Merra-2 can be used as a reference in calculating the potential evapotranspiration rate in an area. The results of climatological data analysis in calculating the potential evapotranspiration rate in several areas adjacent to Wajo Regency can be used as a reference in predicting the potential evapotranspiration rate. Utilization of geographic information system technology in interpolating potential evapotranspiration values in several areas can provide a detailed description of location-specific potential evapotranspiration rates. The results of the calibration of global climatological data with direct measurement data in the field can provide information on the value of potential evapotranspiration in a spatial-based area.
Keywords: Evaporation Potential, Climatological, Crop Water Needs
