1 Division of Soil Science, Agricultural Systems Institute, College of Agriculture and Food Science, University of the Philippines Los Baños, Laguna, Philippines.
2 Mechanization and Postharvest Cluster, Sustainable Impact Platform, International Rice Research Institute, 4030, Los Baños, Laguna, Philippines. j.sandro@irri.org.
3 Mechanization and Postharvest Cluster, Sustainable Impact Platform, International Rice Research Institute, 4030, Los Baños, Laguna, Philippines.