Keosonthi, C., Ingsuraruk, P., Dangprapun, S., Sookgul, P., Narumol, P., Saichompoo, U. and Malumpong, C. 2022. The boosting of anthocyanin accumulation in black rice cv. Riceberry by spraying MgSO4 at two different altitudes under field conditions . International Journal of Agricultural Technology. 18, 4 (Jul. 2022), 1551–1566.