Granular formulations

In granular formulations, the herbicide is mixed with an inert ingredient (a carrier) such as marble chips or clay. Granules vary in shape and size, and are broadcast over the flooded field. The herbicide is then released gradually into the water.

Two examples of granular herbicides used in rice are butachlor and 2,4-D.

These formulations do not require special spraying equipment, if care is taken to distribute than uniformly across the field. Blowers may be a useful mechanical delivery option for herbicides.