Nutrien flux in the Bompon Watershed, Magelang, Central Java, Indonesia

Abstract

In several places, agriculture area is the main contributor of Nitrogen and Phosphate existence in water. This research conducted in Bompon Watershed which has agriculture area 90% of the total area. This study aims to measure the amount of Nitrogen and Phosphate losses during May 2018 - May 2019. The calculation of Nitrogen loss is conducted through field sampling, and load calculation. In the period without measurement, daily load were estimated by interpolation between L and Q relation. The result of this research shows that the most dominant amount of nutrient pollution in Bompon watershed are Nitrate and Phosphate with the number reach 6.5 kh NO3-N/day or 1,084 kg NO3-N/month and 103 kg P/day or 883 kg P/month.