Effects of rice and corn straw biochar combined with microbial inoculant on soil health in protected vegetable production.

The principal findings are as follows: With the increase of soil depth, in different treatments, the content of > 0.25 mm soil aggregates, NCP, and soil organic carbon components showed a decreasing trend, while the BD showed an increasing trend, while there was no significant difference in CP.

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Variation characteristics of soil indicators with soil depth and biochar returning field time With the increase of returning time, all the organic carbon fractions except the mineral-bound organic carbon fraction exhibited a decreasing trend.

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