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organic production
P. T. Stevens and of Dr. Ron Morse, D. H., Nitrogen Management and the Effects of Compost Tea on Organic Irish Potato and Sweet Corn, Virginia Polytechnic Institute and State University , Blacksburg, Virginia , 2008.
Organic resource
M. Kadota and Niimi, Y., Effects of charcoal with pyroligneous acid and barnyard manure on bedding plants, Scientia Horticulturae , vol. 101, pp. 327-332, 2004.