Volume No. 9 Issue No.: 4 Page No.: 1066-1074 April-June 2015




Jamorn Yooyen*1, Saowanee Wijitkosum2 and Thavivongse Sriburi3

1. Department of Environmental Science (IES), Graduate School, Chulalongkorn University, Bangkok (THAILAND) 2. Environmental Research Institute, Chulalongkorn University, Bangkok (THAILAND) 3. Chula Unisearch, Chulalongkorn University, Bangkok (THAILAND)


Received on : January 15, 2015




Biochar is a highly stable form of carbon produced by slow pyrolysis of organic matter. This study explored biocharís ability to improve soil fertility for crop production. The experiment used four different levels of biochar with three replicates in completely randomized block design. The experiment included (1) control (BC 0), (2) biochar 10 t/ha (BC 10), (3) biochar 20 t/ha (BC 20), and (4) biochar 30 t/ha (BC 30). The experiment was conducted in the Pa-Deng Biochar Research Center (PdBRC), Pa-Deng Sub-district, Petchaburi, Thailand. The results showed higher rates of soil nutrients, growth,dry matter and yields in biochar treatments. Moreover, the findings indicated that the biochar treated soils had elevated levels of total nitrogen (TKN) and exchangeable potassium; the differences were statistically significant at p<0.05. TKN levels increased in proportion to the amount of biochar added to the treatment while pH, Organic Matter (OM), available phosphorus and Carbon Exchange Capacity (CEC) did not show statistically significant differences but the likeliness to increase in the biochar treatments. Growth and yields of soybean, including stem height, number of nodes, dry matter of stems, dry matter of leaves,dry matter of pods,and dry matter of seeds ofbiochar treatments show statistically significant differences at p<0.05) compared tocontrol (BC 0). The most significant results obtained in this study was the increases of pods and seeds which were statistically significant (p<0.05). Moreover, according to the results, treatments with 20 t/ha and 30 t/ha of biochar produced seeds weight which were 28.0 percent and 36.8 percent heavier, respectively in comparison to the untreated control.


Keywords : Charcoal, Slow pyrolysis, Food security, Soil improvement, Soil amendment, Soybean