Electronic Theses and Dissertation

ABSTRAK
Air irigasi harus tersedia secara kuantitas dan memenuhi standar kualitas
karena kualitas air yang buruk dapat menyebabkan degradasi tanah dan penurunan
hasil pertanian. Kandungan natrium, karbonat, dan bikarbonat berpotensi merusak
struktur tanah, menurunkan infiltrasi, serta menghambat penyerapan unsur hara
oleh tanaman. Kualitas air irigasi juga dipengaruhi oleh aktivitas antropogenik,
seperti limbah domestik, penggunaan pupuk dan pestisida berlebih, serta kegiatan
pertanian dan perikanan di sekitar saluran irigasi. Penelitian ini dilakukan di Daerah
Irigasi Krueng Aceh, khususnya Saluran Sekunder Data Makmur, yang berperan
penting dalam menunjang pertanian di Aceh Besar dan Kota Banda Aceh.
Penelitian bertujuan menilai kesesuaian air irigasi menggunakan metode Sodium
Adsorption Ratio (SAR) dan Residual Sodium Carbonate (RSC) melalui pengujian
parameter kimia dan fisika yang dilakukan di Balai Standardisasi dan Pelayanan
Jasa Industri Banda Aceh serta Laboratorium Teknik Pengujian Kualitas
Lingkungan Universitas Syiah Kuala. Pengambilan sampel dilakukan sesuai
standar SNI pada beberapa titik pengamatan, kemudian dianalisis untuk
menentukan klasifikasi kelayakan air irigasi. Hasil penelitian menunjukkan bahwa
secara umum kualitas air masih layak berdasarkan nilai pH, DHL, EC, TDS, dan
SAR yang tergolong sangat baik, sedangkan metode RSC menunjukkan bahwa nilai
pada beberapa titik pengamatan tergolong tinggi, sehingga air irigasi
diklasifikasikan tidak sesuai untuk irigasi. Nilai RSC yang tinggi menunjukkan
dominasi karbonat dan bikarbonat yang dapat meningkatkan risiko sodisitas serta
menurunkan kesuburan dan permeabilitas tanah.
Kata Kunci: Kualitas air irigasi, Sodium Adsorption Ratio (SAR), Residual Sodium
Carbonate (RSC)

ABSTRAK Irrigation water must be available in sufficient quantities and meet quality standards because poor water quality can lead to soil degradation and decreased agricultural yields. The presence of sodium, carbonate, and bicarbonate can potentially damage soil structure, reduce infiltration, and hinder nutrient absorption by plants. The quality of irrigation water is also influenced by anthropogenic activities, such as domestic waste, excessive use of fertilizers and pesticides, and agricultural and fishery activities around the irrigation channels. This study was conducted in the Krueng Aceh Irrigation Area, particularly in the Data Makmur Secondary Channel, which plays an important role in supporting agriculture in Aceh Besar and Banda Aceh City. The study aims to assess the suitability of irrigation water using the Sodium Adsorption Ratio (SAR) and Residual Sodium Carbonate (RSC) methods through chemical and physical parameter testing conducted at the Standardization and Industrial Services Office in Banda Aceh and the Testing Laboratory Engineering Environmental Quality of Syiah Kuala University. Sampling was carried out according to SNI standards at several observation points, and then analyzed to determine the classification of irrigation water suitability. The research results showed that, in general, the water quality is still suitable based on pH, BOD, EC, TDS, and SAR values, which are classified as very good, whereas the RSC method showed that the values at some observation points were relatively high, making the irrigation water classified as unsuitable for irrigation. High RSC values indicate the dominance of carbonate and bicarbonate, which can increase the risk of sodicity and reduce soil fertility and permeability. Keywords: Irrigation water quality, Sodium Adsorption Ratio (SAR), Residual Sodium Carbonate (RSC)