Sudiarta, I Made, et al. “Correlation of SPAD Value With Intensity of Blast Disease Attack at Various Ages of Rice Paddy”. Jurnal BETA (Biosistem Dan Teknik Pertanian), vol. 12, no. 1, Apr. 2024, pp. 142-6, doi:10.24843/JBETA.2024.v12.i01.p16.