Abstract
Soil enzyme plays an important role in converting soil nutrient, improving soil fertility and enhancing agricultural products quality. In this paper, the effect of purple soil enzyme activities was investigated by different biogas slurry (BS) recirculation load and period at large-scale farm in southwest China. The results indicated that the value of soil enzyme activities all increased by different BS recirculation load and period comparing to control check group. Its value was at high level by low BS recirculation load and long BS recirculation period. Soil urease and invertase activity reached highest value by T4 (7 m3·hm-2) and T8d (8 d), respectively. The value of soil catalase activity was highest by T1 (40 m3·hm-2) and T10d (10 d). In addition, soil phosphatase activity got peak value by T4 (7 m3·hm-2) and T4d (4 d). The effect of purple soil enzyme activities by BS recirculation at large-scale farms was explored to provide the theoretical basis for utilizing biogas slurry rationally.
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