The soil at planting bean plants from the family of each other for a long time tend to have lower fertility and soil physical conditions worsening. Make a lower yield crop planting. How to adjust the soil better done by their particular fertilizer or organic fertilizer by means of planting bean family, and then plow into manure. Organic fertilizer: fertilizer, compost or a stable by-product from the sugar factory, including sewage sludge (filter-cake) and bagasse (bagasse), etc. When you put these objects in clay อินทรีย substances will help make the soil chemical properties, physical, biological, and better as a result produce increases. Therefore, organic fertilizer, it's considered necessary.