| 原文摘要 | Biochar is one of the products from biomass after thermal treatment as torrefaction, pyrolysis or gasification. Heat or electricity could be provided during the thermal , and biochar as the product can be used as the soil amendment. Former researches pointed out that application of biochar in the field can prolong the retention time of water and nutrition, as the result of the increase of the cation exchange capacity in soil. Besides, it can absorb pesticide, herbicide and heavy metal, hence the spread of pollution can be stopped. But the case of biochar amendment in rice paddy is rare in Taiwan. The local farmers in Dayo community, Chunghua county began to put biochar into the paddies from three years ago. The objectives of this research is to check out whether biochar amendment can increase rice production in central Taiwan area. If it is proved to be positive, we will try to find out the best using percentage of biochar in rice paddies. In the field experiment, we tested the soil properties including but not only pH, electric conductivity, water content, soil organic matter, water holding capacity and biochar content in soil. The diameters for plant growth and grain like plant hight, length of flagleaf, length of panicle, grain number per panicle, plumpness and 1000-grain weight were measured. In the pot experiment carried out in the green house, elements amount in soil and plant growth were tested under various treatment under different content of biochar. The results from the fields experiment revealed that with the amendment of biochar, the paddies can handle higher density than usual while the grain per plant did not drop. And the pot experiment suggested that the best using percentage of biochar for rice paddy should between 3% to 6%. |