Maize straw returning to the field also decreased soil bulk density.
秸秆还田还降低了土壤容重。
Maize straw returning to the field can increase the soil total nitrogen and inorganic nitrogen content.
秸秆还田增加了土壤全氮和无机氮含量。
The utility model introduces a mechanism for guiding a valve piston returning to central positions, belonging to the technical field of a servomotor with follow-up action.
本实用新型介绍一种引导阀活塞复中机构，属于具有随动作用的伺服马达技术领域。
The utility model introduces a mechanism for guiding a valve piston returning to central positions, belonging to the technical field of a servomotor with follow-up action.
本实用新型介绍一种引导阀活塞复中机构，属于具有随动作用的伺服马达技术领域。
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