Prediction equations for losses of axial flow rice combine harvester when harvesting Khaw Dok Mali 105 rice variety

Abstract

The objective of this study was to predict losses of combine harvester when harvesting Khaw Dok Mali 105 rice variety. The results of the study indicated that grain moisture content (MC), grain to material other than grain ratio (GM), service life of cutter bar (Y), cutter bar speed (V), reel index (RI), stem length (H), tine clearance over cutter bar (C), tine spacing (R), product of RI and R (RI*R), product of V and C (V*C), V2 , RI2 , louver inclination (LI), feed rate (FR) and product of MC and GM (MC*GM) were the major parameters affecting the harvest losses. The prediction equations had R2 = 0.91. The average losses given by the estimation equation was 0.31% different from the measurement. The predicted losses errors were 5.47% and 0.54% for average percentage error and standard error respectively.