Abstract
The purpose of this study was to select a burner by assessing the flame temperature distribution of several typesof burners, build a flame weeder, and quantitatively evaluate its effects on weed control. Barnyardgrass (54.4%) and largecrabgrass (34.9%) were two dominant weeds in the test field. The significant variables tested were gas pressure and operatingspeed, which eventually led to the dose, i.e., the amount of LPG per unit area (kg/ha) needed for weed control. The weedcontrol rate was above 80% with the LPG dosage at 40 kg/ha or more, and above 90% with the dosage over 60 kg/ha. Theoperating efficiency for a weed control rate higher than 60% was 0.14 ha/hr. In the second year of the study, a LPG dosageof 57.4 kg/ha was applied for continuous flaming as one effective measure of weed control. Three consecutive flame treatmentsyielded a 99% control rate at 1 km/h tractor speed.
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