Soil to grow plants other than legumes mixed with each other for a long time. Often are less plentiful. And the physical condition of soils deteriorate with. Crop yields lower. How to improve the soil better dealt with fertilizer. Especially organic fertilizers Or by plowing and planting legumes as green manure. Organic fertilizers include compost or manure byproduct of the sugar industry, including sludge (filter-cake) and bagasse (bagasse), etc. When these chemicals into the soil organic matter. Will help make the soil chemical, physical and biological better. As a result, productivity increased. The organic fertilizer is considered necessary.