求翻译：　　面对山区农民种地费力用工多,作物产量不高的耕种弊端,林英青下决心改变。高中毕业的他自学了农函大课程,经过潜心试验研究,设计制作了新型播种施肥镐,无数次的失败后,产品终于定型成功。（发明起止时间不详）是什么意思？

Lin Yingqing determined to change the face of the mountain farmers farming more strenuous labor, crop yield is not high farming drawbacks. High school graduation, he taught himself the the Handa agricultural courses, after devote themselves to experimental research, the design of a new seeding and f