In compare with the external force feed type, the uniformity of dropping may be increased by 10-30% when sowing wheat, sorghum, millet and corn.
2
本文主要从两个方面对覆膜穴播机具进行分析：一是鸭嘴式成穴器的成穴机理；二是外槽轮式排种器的分析。
The test mostly analyse the film mulching hill-drop planter from two aspects: One is mechanism of duck-mouth type punching-opener, One is analyse of metering device .
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