| In order to study the effects of biochar on soil enzyme activities and millet yield, setting five treatments antaining different amounts of biochar, they were B0(0 t·hm-2), B15(15 t·hm-2), B30(30 t·hm-2), B45(45 t·hm-2) and B60(60 t·hm-2), and a pot cultivation experiment was set up in sandy soil, loam soil and saline soil, respectively. The results showed that soil enzyme activities reached the highest when the amounts of biochar were 45 t·hm-2, 45 t·hm-2 and 30 t·hm-2 in sand, loam and saline soil respectively. The maximal values of total enzyme activity index in saline, sand and loam soil increased 16.59%, 7.29%, and 4.07% more respectively than the control B0. This implied the effect of biochar on enzyme activity in saline soil was higher than that in sand, followed by that in loam soil. Obvious effects in increasing millet yield could be achieved by application of biochar in the sand, whereas no significant effects could be observed in loam and saline soil. The use of biochar promoted the accumulation of millet biomass in sand soil, and accumulation of millet biomass in the loam soil was higher than that of saline and sand soil. In conclusion, the application of biochar in the soil could not only promote millet yield and increase soil enzyme activities, but also improve biological properties of soil. |