RESIDU PUPUK NITROGEN DI LINGKUNGAN PERAIRAN HULU DAERAH ALIRAN SUNGAI TONDANO PROVINSI SULAWESI UTARA

Abstract

The Nitrogen fertilizer which is not absorbed by plant will be impact to residue in  the
environment.  The aim of this study was to assess the residues of nitrogen in the aquatic
environment up stream of the Tondano Watershed during 2013-2015 (three years).  Data
collected by observation of agriculture activity and determination of sampling by using
composite sampling method in River Panasen which is paddy irrigation outlet canal up
stream of the Tondano Watershed during 2013-2015 (three years), was measurement each
three month and analysis nitrate, nitrite, ammonia in the Laboratory.   Method data analysis
are Graphic Method and to compare with standart Goverment PP. No. 82/2001 Class II.
Results showed that the nitrogen residue concentration (nitrate, nitrite, ammonia) at
aquatic environment in the up stream of Tondano Watershed on the growing season in 2013
nitrate concentration: 0,293-0,408 mg/l; nitrite 0,001-0,041 mg/l; ammonia 0,04-0,28 mg/
l. in the growing season in 2014  concentration nitrate: 0,184-0,628 mg/l; nitrite 0,020,077
mg/l;
ammonia
0,002-0,13
mg/l.

in
the
growing
season
in
2015

concentration
nitrate:
0,173-0,585
mg/l;
nitrite
0,001-0,029
mg/l; ammonia
0,05-0,10
mg/l.