The impact of nitrogen fertilizer on the aquatic environment in the Upper Tondano watershed, North Sulawesi Province

Abstract

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).

Grey water footprint of crop in Riau Province

“…The transportation of nutrient residues resulting from fertilisation practices, including the application of urea fertiliser, will be facilitated through irrigation systems. Urea (CO (NH2)2) undergoes hydrolysis to yield ammonium nitrate, which is then absorbed by plants in the form Poor of ammonium (NH4 + ) and nitrate (NO3 -) [19][20][21]. In the event that these nutrients are not taken up by plants, they may be carried into irrigation canals and water bodies, such as rivers.…”

The effect of circulation rate on the water quality of container-type recirculation aquaculture system under different feeding rates ofSchizothorax wangchiachii

“…After the concentration of harmful substances, such as ammonia nitrogen, in the aquatic environment of the aquaculture reaches a certain value (Wantasen et al, 2020), non-ionized ammonia is prone to entering the bodies of the aquatic environment through the cell membrane, leading to physiological imbalance and disorder, leading to tissue hypoxia and toxicity (Li et al, 2007). At the same time, a certain concentration of nitrite can inhibit and affect the growth, development, and reproduction of aquaculture organisms, which can damage or even kill the oxygen-carrying capacity of hemocyanins (Chand & Sahoo, 2006).…”

Correlation of Rice Production and Greenhouse Gas Emissions in North Sulawesi Province

“…A strict policy in the local administration for converting productive land to annual crops and rice paddies is to control sedimentation in Lake Tondano (Walangitan et al 2012). Another research in Lake Tondano found that nitrogen (from agricultural activity surrounding the lake) transformed into nitrate, nitrite, and ammonia, which made Eichhornia crassipes became an invasive species (Wantasen et al 2012). Therefore, the local farmers need proper formal education and farming skill (Lubis & Langston 2015;Purba & Pratiwi 2020).…”