Electronic Theses and Dissertation

Mengalirkan air dari sumber air yang tersedia ke lahan untuk memenuhi kebutuhan
tanaman disebut irigasi. Sumber pencemaran pada air irigasi salah satunya disebabkan oleh
aktivitas manusia. Dalam penelitian ini, sumber pencemaran pada air adalah hasil dari aktivitas
manusia, yang ditunjukkan oleh angka kepadatan penduduk yang terus meningkat di suatu
daerah. Semakin tinggi angka kepadatan yang diasumsikan, maka semakin besar kemungkinan
pencemarannya. Banyaknya lahan pemukiman serta tingkat kepadatan penduduk yang tinggi
terutama di Kecamatan Blangpidie dengan jumlah 24.440 jiwa penduduk mengakibatkan
timbulnya berbagai permasalahan diantaranya adalah meningkatnya sumber pencemaran
limbah domestik dan limbah pertanian yang akan mempengaruhi kualitas air irigasi.
Metode yang digunakan pada penelitian ini adalah metode deskriptif kuantitatif melalui
survei lapangan yang didasarkan pada pengambilan sampel air di lapangan dan analisis sampel
air di laboratorium. Pada penelitian ini, penentuan lokasi pengambilan sampel dilakukan
dengan cara purposive sampling dimana pemilihan sampel berdasarkan kriteria jarak dan
sumber pencemar. Pengambilan sampel air dilakukan pada saat musim kemarau dan diambil
pada 4 titik lokasi yaitu: intake (1 sampel air), saluran primer (1 sampel air), saluran sekunder
(1 sampel air) dan saluran tersier (1 sampel air). Pada tiap titik sampel air diambil pada
permukaan, pertengahan dan dasar air kemudian di komposit dan dicampurkan menjadi satu.
Sampel air yang dianalisis di laboratorium yaitu DHL, pH, Natrium (Na), Klorida (Cl) dan
Sulfat (SO4).
Berdasarkan hasil analisis laboratorium, DHL pada lokasi penelitian berkisar antara
88,04-93,60 mS.cm-1 termasuk dalam kategori sangat baik. pH pada lokasi penelitian berkisar
antara 6,08-7,13 termasuk dalam kategori sangat baik. Kandungan Natrium (Na) pada lokasi
penelitian berkisar antara 2,12-3,23 mg.L-1 termasuk dalam kategori sangat baik. Kandungan
Klorida (Cl) pada lokasi penelitian berkisar antara 3,05-3,56 mg.L-1 termasuk kategori sangat
baik dan kandungan Sulfat (SO4) pada lokasi penelitian

Flowing water from available water sources to land to meet plant needs is called irrigation. One source of pollution in irrigation water is human activity. In this research, the source of water pollution is the result of human activity, which is indicated by the increasing population density in an area. The higher the assumed density number, the greater the possibility of pollution. The large number of residential areas and the high level of population density, especially in Blangpidie District with a population of 24,440, has resulted in the emergence of various problems, including increasing sources of domestic waste pollution and agricultural waste which will affect the quality of irrigation water. The method used in this research is a quantitative descriptive method through a field survey which is based on taking water samples in the field and analyzing water samples in the laboratory. In this research, the determination of sampling locations was carried out using purposive sampling where sample selection was based on the criteria of distance and source of pollution. Water samples were taken during the dry season and taken at 4 location points, namely: intake (1 water sample), primary channel (1 water sample), secondary channel (1 water sample) and tertiary channel (1 water sample). At each point water samples are taken at the surface, middle and bottom of the water and then composited and mixed together. Water samples analyzed in the laboratory are DHL, pH, Sodium (Na), Chloride (Cl) and Sulfate (SO4). Based on the results of laboratory analysis, DHL at the research location ranged between 88.04-93.60 mS.cm-1, which is included in the very good category. The pH at the research location ranged between 6.08-7.13, which is in the very good category. The sodium (Na) content at the research location ranged from 2.12-3.23 mg.L-1, which was included in the very good category. The Chloride (Cl) content at the research location ranged between 3.05- 3.56 mg.L-1, including the very good category and the Sulfate (SO4) content at the research location