Most producers use herbicides to manage weed infestation. Generally, the herbicides are used at a uniform rate to the entire field.
However, a uniform application may not be appropriate for all areas of the field. This is because some of the factors are influencing
the rate of herbicides. The soil properties like organic matter content are influence the rate of herbicides in lowland crop such as
paddy. The site specific area that has rich in organic matter content are need the large amount of herbicide because soil with high
organic matter need a higher herbicides application rates to ensure sufficient effectiveness. As precision agriculture technologies
has been develop such as Global Positioning System (GPS) and Geographic Information System (GIS) which it can differentiated
application of herbicides to minimizing herbicides cost, maximize weed control and prevent the environmental waste.