Sari, Putri, Indarto Indarto, Marga Mandala, & Bowo Eko Cahyono. " Mapping of Soil Quality Index (SQI) for Paddy Fields Using Sentinel-2 Imagery, Laboratory Analysis, and Principal Component Analysis." Geosfera Indonesia [Online], 6.2 (2021): 173-188. Web. 26 Apr. 2024