ANALYSIS OF TOTAL NITROGEN LEVELS IN SOLID FERTILIZER WITH KJEDAHL METHOD IN BALAI PENGKAJIAN TEKNOLOGI PERTANIAN (BPTP) YOGYAKARTA

An analysis of the determination of N-Total levels in fertilizer has been carried out at the Yogyakarta Agricultural Technology Assessment Center (BPTP). This study aims to determine the total nitrogen content in the fertilizer sample. Analysis of nitrogen content in fertilizers was carried out using the Kjeldahl method. The principle of determining total nitrogen using the Kjeldahl method is that nitrogen in fertilizer samples is hydrolyzed with concentrated sulfuric acid to form ammonium sulfate compounds. The product of the destruction is ammonium sulfate compound which is distilled in an alkaline condition which is then accommodated with boric acid. The resulting distillate is titrated with sulfuric acid solution until a green color changes to pink. From the results of the levels of N-Total obtained in the sample PO.207 with N-Total 1.8136%, PO.208 with N-Total 1.5597%, PO.209 with N-Total 1.5489%, PO.210 with N-Total 1.385%, PO.211 with N-Total 1.1292% and PO.212 with N-Total 2.2401%.