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A soil amendment is any material added to a soil to improve soil physical properties, support plant growth, improve soil fertility, organic matter, and water holding capacity, improve soil chemical and biological properties.  Biochar as organic amendment improve soil fertility, mitigate climate change, and effective keep nutrients and available to plants. The chemical and physical properties of the biochar is important to know the suitable applications of biochar.  The chemical and physical properties of the biochar are depending on the process and biomass feedstock. The research aimed to find out the kind of biomass feedstock for biochar as a soil amendment. The biochar feedstock were evaluated using scanning electron microscopy (SEM) and electron dispersive X-ray (EDX) analysis and can predicting possible uses for the biochars. The result showed that the biochar surface morphology properties were influenced by the feedstock types and pyrolysis temperature. The pores development and mineral contents in coconut shell biochar is the most suitable for soil amendment.

soil amendment, pore morphology, soil fertility, biomass