ASSESSMENT CLIMATE-BASED AGRICULTURAL WATER BALANCE IN EAST KALIMANTAN PROVINCE, INDONESIA
Keywords:
water balance, rainfall, evapotranspiration, croppingAbstract
East Kalimantan's climate is influenced by the monsoon winds and because of its geographical position on the equator, it is affected by the equatorial climate. The aim of this research is to develop a soil water balance model to calculate the amount of stored water. In dry land crop cultivation, water is the main resource and the most important limiting factor in plant growth. This study conducted a Thornthwaite-Mather water balance analysis using 20 years of climate data (2000-2020) to understand the water potential of East Kalimantan province. The assessment consists of a calculation that accounts for all significant inputs and outputs of water to and from the surface water; method used in this research is a quantitative descriptive method. Analysis of the water balance is based on rainfall, air temperature and evaporation, with a monthly period. Studies have shown that the differences in the monthly water balance in East Kalimantan is 223 mm year-1 of water surplus in 9 months, and the driest in 3 months, August tends to be the driest of the year and exhausting the total deficit values arrived 72 mm year-1. However, annual precipitation is greater than annual evapotranspiration.
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