Uniformly herbicide rate is used as a conventional practice in Thailand
for controlling weeds in sugarcane fields. Since weeds usually grow in certain areas with nonuniformly
distribution, uniform herbicide rate approach is not suitable and non-sustainable agricultural
technique both in terms of economic an environmental aspect. To address these issues, Variable
Herbicide Rate (VHR) was introduced. The VHR composes of two main components, which are weed
monitoring and real-time spraying.