3. Sustainable agriculture and agricultural system of nature.His majesty that focus on resource management in a manner to concentrate on-farm use nature. Which is consistent with how important he is another saving is emphasized the need to reduce costs in the livelihood of farmers, down to a minimum. Based on the dependency on the nature is very important. How he has since encouraged farmers to use cattle in farming rather than using a machine to have crop rotation, especially legumes. To reduce the cost of fertilizer. The case of need fertilizer is encouraged farmers to use fertilizer manure instead, which is expensive. As well as to avoid using various chemicals that affect the environment and the quality of the soil in the long term. Let the people in the community and the environment. And have better economic status, which is the principle of "sustainable agriculture" (กรมวิชาการเกษตร, 2539: 170-1).Sustainable agriculture system should look natural resource management agricultural production that mimic the natural forest ecosystem The biological diversity, mechanisms of control. Have to rely on external inputs from at least as needed. For protection and pesticide to reduce the use of chemicals. By using the method of integrated pest management Namely, should pay attention to the cropping system supportive to create a natural balance system, agriculture (Supatra 2540: 76-7).Currently, there are experimental methods of sustainable agriculture in the center area srinagarindra, Phetchaburi, Center for the study of he stacked stone. Center for the study of gold. Center for the study of Huai Hong khrai, etc. there are various activities according to the continent and in accordance with the principles of sustainable agriculture. The. System of crop rotation, the integrated agricultural systems, agroforestry system and agricultural system of nature.
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