Engineering began to affect the farmer late in the 19th century, with steam-powered tractors and various tools for drillingseed holes and planting.
十九世纪后期，工程技术开始对农户产生影响，人们利用蒸汽驱动的拖拉机和各式工具来钻孔和播种。
2
In order to improve the drilling quality and the automation of the precision drill, an automatic monitoring alarm and digital seed rate display system was developed.
为了提高精密播种机的工作质量和自动化水平，研制了工况自动监控报警系统及播量数显系统。
3
Seed spacing is the key factor of the effects on the quality of precision drilling.