Southavong, S. (2012). Effect of soil amender (biochar or charcoal) and biodigester effluent on growth and yield of water spinach, rice and on soil fertility: Master of science thesis in agricultural sciences animal husbandry. Can Tho: Can Tho university.

Southavong, Sisomphone. Effect of Soil Amender (biochar or Charcoal) and Biodigester Effluent On Growth and Yield of Water Spinach, Rice and On Soil Fertility: Master of Science Thesis in Agricultural Sciences Animal Husbandry. Can Tho: Can Tho university, 2012.

Southavong, Sisomphone. Effect of Soil Amender (biochar or Charcoal) and Biodigester Effluent On Growth and Yield of Water Spinach, Rice and On Soil Fertility: Master of Science Thesis in Agricultural Sciences Animal Husbandry. Can Tho: Can Tho university, 2012.