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Nitrogen fertilization is needed as a source of nitrogen in the growing plants. Nitrogen in the environment will undergo a transformation in the form of compounds such as nitrate (NO3 −) and nitrite (NO2 −). The transformation from nitrogen to nitrate, nitrite, will have a negative impact on the aquatic environment namely the formation of toxic conditions. The main purpose of this research was to study the residual nitrogen fertilizer in the outlet of paddy irrigation upper Tondano Watershed and to evaluate the residual nitrogen fertilizer in the outlet of paddy irrigation upper Tondano Watershed 5-years period (2015-2019). Water quality sampling was carried out using a composite sampling method at two sample locations in River Panasen, in situ measurement of water temperature parameters, and pH. Analysis of the parameters of nitrate and nitrite was carried out in the laboratory. Data were analyzed using descriptive statistics. The results showed that the concentration nitrate of -0.9330-153 mg/l (according Government standard PP No. 82/2001 nitrate 10 mg/l), and nitrite of 0.001 mg/l-0.52 mg/l exceed PP No. 82/2001 quality standard (0.006 mg/l).

Water resources are one of the natural resources that are vital both for the life of organisms on the earth as well as for daily human needs in various sectors of life. Due to limited resources, water management becomes essential. A study in the spatial-temporal of chlorine on the Tondano watershed is important because domestic agricultural waste has the potential to cause residues and affect water quality degradation. This study aims to examine the spatial and temporal distribution of chlorine in the upper Tondano watershed throughout seven years (2013-2019). Water sampling was carried out using the composite sampling method on the river and irrigation channel outlets. Chlorine concentration was measured by UV-VIS Spectrophotometry method, and other water quality parameters such as pH and temperature were measured in the field. The chlorine concentration fluctuated for each month during 2013 – 2019 (0.02 mg/L to 0.59 mg/L, Quality Standard PP 82/2001 chlorine 0.03 mg/L). The highest values were in March, September, and November. The trend showed that chlorine levels were above the quality standard in March and November. The high concentration of chlorine in the Panasen River water bodies is partly due to the application of KCI fertilizers and, pesticides in rice fields and horticultural lands, as well as domestic waste.

Water Irrigation a very important and is one key to the success of the increased production of rice plants in the paddy field.  The aim of this study was to assess the water quality Irrigation Dumoga at Kabupaten Bolaang Mongondow Province Sulawesi Utara. Data collected by observation of agriculture activity and determination of sampling by using composite sampling method at canal Irrigation Dumoga. Measurement in situ pH, and temperatur.  Analysis concentration total dissolved solid (TDS), total suspended solid (TSS), conductivity (DHL), nitrate and phosphate, sodium, calcium, magnesium in the Laboratory.  Method data analysis are Graphic Method and to compare with standart Goverment PP. No. 82/2001 Class IV, and Sodium Absorption Ratio (SAR) Analysis.   The results showed that temperatur at canal Irrigation Motabang 29,3 C, pH 7,12, value of the total dissolved solid (TDS) 127 mg/l, total suspended solid (TSS) 7 mg/l, conductivity (DHL) 182 µS/cm, nitrate 0,040 mg/l, phosphate 0,076 mg/l  mg/l eligible accordance with the standard PP No. 82/2001 Kelas IV.  Natrium concentration 6,38 mg/l, kalsium 0,76 mg/l, magnesium 0,27 mg/l.

Water quality of the Panasen River in upstream of Tondano’s watershed is important to study because the Panasen River crosses residential areas, agriculture, and livestock farms, carrying solid and liquid wastes from these activities, which ultimately leads to Lake Tondano. This waste has the potential to become residue in Lake Tondano. The objective of this research was to study water quality of the Panasen River in the upper of the Tondano watershed throughout a five-year period (2014-2018). Water sampling is done by using composite sampling in the one location of Panasen River which become the inlet of Lake Tondano, analyzed using Colorimetry method, and compared with the Quality Satndard in accordance with the Law of No. 82/2001 Class II about Water Quality Management and Water Pollution Control (KLH, 2001). The results showed that 30 parameters (temperature, pH, TDS, TSS, NH3, DO, BOD, COD, chloride, CN, F, NO3, NO2, sulfate, sulphide, PO4, As, B, Ba, Cd, Co, Cu, Fe, Mn, Pb, Se, Zn, Hg, Cr-VI, surfactant (MBAS)) analyzed generally met the Water Quality Standard in accordance with the Law of No. 82/2001, except the chlorine parameter concentrations: Chlorine concentration in 2013 (0,1 mg-0,19 mg/l), 2014 (0,1 mg/l-0,44 mg/l), 2015 (<0,02 mg/l- 0,11 mg/l), 2016 ( 0,05 mg/l − 0,08 mg/l), 2017 (<0,02 mg/l-0,07 mg/l), 2018 (0,03 mg/l-0,06 mg/l). Average chlorine concentrations exceeded Quality Standards according to the Law of No. 82/200101 (Chlorine 0,03 mg/l). The high concentration of chlorine in the Panasen River water bodies is partly due to the application of KCI fertilizers, pesticides to rice fields, horticultural lands, and domestic waste.

Traditional gold mining in Toraut Watershed Bolaang Mongondow District was used Merkuri Amalgamation that produced tailing. Tailing are discharged to river and environment sorounding that can enter Toraut River and flows to the down stream Mongondow river (beach Inobonto). This study aims: 1) To determine Hg concentrations in River Toraut up stream, middle stream and down stream; 2) To determine Hg concentrations in sediment of the River Toraut up stream, middle stream and down stream; 3) To determine Hg concentrations in aquatic plantsof the River Toraut up stream, middle stream and down stream. Location research in River Toraut up stream, middle stream and down stream. Data collected by observation and laboratory analysis Merkuri concentration in River Toraut, sediment, and aquatic plant. Method data analysis are descriptif, Graphic Method and to compare with standart Goverment PP. No.82/2001 Class II. The analysis showed that the concentration of Merkuri in River Toraut up stream, in the middle stream and down stream is<0.00005 mg/l. The concentration of Merkuri in sediments River Toraut up stream, the middle stream and down stream ranged < 0.05-1.45 mg/kg dry. The concentration of Merkuri in tissue plant aquatic location up stream of the River Toraut, the middle stream and down stream range < 0.001-0.013 mg /kg wet . ABSTRAKPengolahan emas secara tradisional di Daerah Aliran Sungai (DAS) Toraut menggunakan Merkuri (Hg) dalam proses amalgamasi menghasilkan limbah. Limbah pengolahan tersebut dibuang ke sungai dan lingkungan sekitar dapat masuk ke Sungai Toraut dan mengalir sampai ke Sungai Mongondow hilir serta bermuara di laut. Penelitian ini bertujuan untuk mengetahui: 1) Konsentrasi Merkuri (Hg) di air Sungai Toraut bagian hulu, tengah dan hilir; 2) Konsentrasi Merkuri (Hg) di sedimen Sungai Toraut bagian hulu, tengah dan hilir; 3) Konsentrasi Merkuri (Hg) di tanaman air yang terdapat di Sungai Toraut bagian hulu, tengah dan hilir. Lokasi penelitian adalah Sungai Toraut bagian hulu, tengah dan hilir.Cara penelitianadalah observasi lapang dan analisis laboratorium konsentrasi merkuri yang terdapat di air Sungai Toraut, sedimen dan tanaman air. Metode analisis secara deskriptif, tabelaris dan membandingkan dengan standar baku mutu PP No.82/2001 Kelas II. Hasil analisis menunjukkan bahwa Konsentrasi Merkuri di Sungai Toraut bagian hulu, bagian tengah dan bagian hilir adalah<0,00005 mg/l. Konsentrasi Merkuri di sedimen Sungai Toraut bagian hulu, bagian tengah dan bagian hilir berkisar antara <0,05-1,45mg/ kg dry. Konsentrasi merkuri di jaringan tanaman air lokasi Sungai Toraut bagian hulu, bagian tengah dan bagian hilir berkisar antara <0,001-0,013mg/ kg wet. Kata kunci: biomonitoring, dampak ekologis merkuri, DAS Toraut Eugenia

The spatio temporal distribution of nitrogen in catchment area of   Lake Tondano wasimportant to investigate because agricultural residue comes from the catchment potentiallydecreased water quality in Lake Tondano. The purpose of this study was to examine thedistribution of nitrogen spatially and temporally in the catchment area of Lake Tondano.The study was conducted in the field and laboratory. Water quality sampling conducted byusing composite sampling on the rivers, lake Tondano and outlet of irrigation channels.The data collected was the total nitrogen, nitrate, ammonia in 2001, 2008 and 2014. Datawere analyzed using Graph Method and Spatial Analysis.        The results showed that the distribution of total nitrogen that has a high concentrationfound in the outlet streams and irrigation canals outlet. High nitrate accumulates in theoutlet of Lake Tondano. Nitrate concentration can be divided into 9 (nine) classes, namelyconcentration of 0.100 to 0.211 mg / l; 0.211 to 0.322 mg / l;  0.322 to 0.433 mg / l;  0.433 to0.544 mg / l; From 0.544 to 0.655 mg / l; From 0.655 to 0.766 mg / l; 0.766 to 0.877 mg / l;0.877 to 0.988 mg / l; and 0,988- 1,100 mg / l. Ammonia, spatially spread evenly on thesurface of Lake Tondano. Ammonia concentration can be divided into 9 (nine) class is aclass that has a concentration of 0.000 to 0.064 mg / l; From 0.064 to 0.129 mg / l; 0.129 to0.193 mg / l; From 0.193 to 0.258 mg / l; 0.258 to 0.322 mg / l; 0.322 to 0.387 mg / l; From0.387 to 0.451 mg / l; 0.451 to 0.516 mg / l; and from 0.516 to 0.580 mg / l. Concentrationsof nitrate and ammonia fluctuated from year to year of observation. This was influenced byfertilization in rice fields.

The suitability of water for irrigation purpose can be determined using the Sodium Adsorption Ratio (SAR) method. The method describes the extent of sodium will be absorbed into the soil. This study aims to assess the water quality of the Talawaan river as a source of irrigation water using the Sodium Adsorption Ratio (SAR) method. The measurement was carried out by field observation at the tertiary channel and laboratory analysis of water samples obtained from the channel. The concentration of Na+, Ca2+, Mg2+ were calculating using the SAR. Sampling of Water quality parameters was determined using the Composite Sampling, then analyzed with the UV-Spectrophometry The data referring to the standard values from Ayers and westcott. The results showed that the Sodium Adsorption Ratio (SAR) at the Talawaan irrigation varied from 1.33 meq/l to 1.55 meq/l. These results meets the requirements of the Ayers and Westcott standard standard, which stated that SAR at less than 3 meq/L is good quality standard (table 2). SAR value affects soil conditions, especially related to soil structure and soil permeability and infiltration.