The second to solve soil erosion is add organic matter. Organic material may be added as straw,organic fertilizer, green manures,or a manure to improves fertility of soil. Agriculture (2006) found that " organic matter is the main source of energy for soil organisms, both plant and animal. It also influences the infiltration capacity of the soil, therefore reducing runoff " (p.5). Moreover,this improves the cohesiveness of the soil and increases its water retention ability.