M. Mahmudi, O. A. Samson, and S. Oktarianti, “Plant growth-promoting rhizobacteria and ash applications enhance tomato yield in Ultisol”, J. Agron. Indonesia (Indonesian J. Agron.), vol. 54, no. 1, pp. 43–53, Jun. 2026, doi: 10.24831/jai.v54i1.70805.