The experiment was carried out to evaluate effects of covering wheat straw in apple orchard and apricot orchard on soil humus composition, microflora and soil enzyme activities.

在杏园和苹果园覆盖麦草，研究其对土壤腐殖质组成、微生物区系及土壤酶活性变化的影响。

youdao

The results showed that long term fertilization affected not only the content and composition of soil humus, but also the physicochemical property of the soil humus.

结果表明，长期施肥不仅影响土壤腐殖质的含量与组成，还影响腐殖质的理化性质。

youdao

This paper presented the conception and studying methods of HM, and compared the composition and optical property of Humus and HM in different soils.

本文在腐殖质组成研究基础上，提出了HM组成概念和研究方法，并比较了不同类型土壤腐殖质组成、HM组成及光学性质。

youdao