[Objective] In order to select the appropriate biochar for soil improvement and remediation

the physical and chemical properties of biochar produced from chicken manure

the enteromorpha and straw were compared

and the effect of biochar on capacity of soil water holding was also compared.[Methods] The biochars were produced at 350

500 and 650℃ under anoxic condition. To investigate the impact on soil and properties of biochar produced from three types of biowaste

the elements analysis and pot experiments were performed.[Results] The element contents in three types of material were obviously different. The contents of carbon

hydrogen and ash in straw were higher than those of others. However

it was found that nitrogen content was higher in chicken manure

and carbon content was lower in enteromorpha but oxygen content was higher. Carbon content and nitrogen content of biochar produced from chicken manure were higher than those of the other two feedstocks

and carbon content of enteromorpha was lower. The H/C mole ratio of biochar was obviously lower than that of feedstock

and it decreased with the increase of pyrolysis temperature. However

the C/N mole ratio increased slowly with the increase of pyrolysis temperature. Moreover

it was found that the pH value of biochar produced from different feedstocks increases with pyrolysis temperature. The pH values increased from 6.82~8.35 to 9.33~10.29. Furthermore

the pH values increased as ash content increased. The pH values of biochar increased variously with the increase of ash content

for the three types of biochar

the increase rate ranked:straw > enteromorpha > chicken manure. It was also found that the water holding capacity of biochar produced from three types of feedstocks gradually improved with the increase of pyrolysis temperature.[Conclusion] Biochar produced from chicken manure behaved better than others did in nutrients providing and water holding capacity.