For planting tapioca in the rainy season, it is recommended to construct ridges. The land can then easily be drained, without much damage to the tapioca cuttings planted. Weeding can be done by hand between the ridges, to be followed by spraying weedicides such as Grammoxone. The height of the ridges can keep the weedicide away from the tapioca plants. Paraquat (or Gramoxone) may also be used. In slope land, ridges should be constructed against the water flow. This is important in reducing soil erosion and increasing tapioca yield.