Most of the land use constraints in tapioca production are undulating landform and infertile coarse-textured soils which normally contain low organic matter contents.  The soils can be very compact and the water retention is low.  Over time, the yield will decrease.  Even the application of chemical fertilizer will not help much.  With soil erosion, much of the nutrients will be washed away.  In order to increase tapioca production, the soil must be improved by adding more organic matter and reducing loss of nutrients.  Vetiver grass can be grown against the waterway.  Organic matter content of the soil can be increased by growing legumes between the tapioca rows and then ploughing under thereafter when they start to flower.  After harvesting is done, the remnants of tapioca branches and leaves that leftovers on the ground can also be used as green manure.