Prabhu, A.S. et al. 1999. Relationship between potassium fertilization and panicle blast severity in upland rice. Pesquisa Agropecuaria Brasileira. 34, 9 (Sep. 1999), 1729–1732. DOI:https://doi.org/10.1590/S1678-3921.pab1999.v34.5422.