References

Arnut, T., 2006. Applied Natural Agriculture Principle Guideline Practice in Thailand. National Science and Technology Development Agency, Pathumthani, Thailand, ISBN: 9742298688.

Berry, P.M., B.R. Sylvester, L. Philips, D.J. Hatch, S.P. Cuttle, F.W. Rayns and P. Gosling, 2002. Is the productivity of organic farms restricted by the supply of available nitrogen. Soil Use Manage., 18: 248-255.
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Green Net and Earth Net Foundation, 2008. Principle of organic agriculture. Green Net and Earth Net Foundation, http://www.greennet.or.th/Research/t5100.htm#heading02.

IFOAM, 2008. Definition of organic agriculture. International Federation of Organic Agriculture Movement. http://www.ifoam.org/growing_organic/definitions/doa/index.html.

Kuepper, G. and L. Gegner, 2004. Organic Crop Production Overview. National Sustainable Agriculture Information Service, National Center for Appropriate Technology, USA.

Mahmoud, C. and G. Shively, 2004. Agricultural diversification and integrated pest management in Bangladesh. Agric. Econ., 30: 187-194.
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Organic Agriculture Certification Thailand, 2005. ACT organic agriculture standards 2005. Organic Agriculture Certification Thailand (ACT), http://www.actorganic- cert.or.th/ download/ACTstandard2005e.pdf.

Rampaiprapa, M., 2005. Innovation in Agricultural Resource Management for Organic Agriculture: Case Study of Organic Rice Farmers Group, Amphoe Kudchum, Changwat Yasothon. Kasaetsart University, Bangkok, Thailand, ISBN: 9749838009.

Somkid, D., 2006. International Organic Agricultural Standard in Thailand. Jamjuree Product Printing, Bangkok, Thailand, ISBN: 9749405382.

Van Elsen, T., 2000. Species diversity as a task for organic agriculture in Europe. Ecosyst. Environ., 77: 101-109.
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