论文部分内容阅读
一、引言土壤耕作指的是作物生产过程中所产生的任何形式的土壤运动。土壤运动可以是自然变化的结果,如土壤的膨胀收缩和冻融作用;也可以是土壤耕作机具、拖拉机、收获机等机械设备作用的结果。某些情况下由耕作措施所造成的土壤运动,改善了作物生长的环境(建设性耕作)。但另一方面,也会由于收获、运输、喷雾等非耕作措施和甚至是由于拖拉机在进行正常耕作时的压实作用,而产生一些不必要的但往往是不可避免的土壤
I. INTRODUCTION Soil cultivation refers to any form of soil movement that occurs during crop production. Soil movement can be the result of natural changes such as soil expansion and contraction and freeze-thaw; it can also be the result of the action of soil-tillage machines, tractors, harvesters, and other machinery and equipment. Soil movement caused by tillage practices has in some cases improved the environment for crop growth (constructive farming). On the other hand, however, some unnecessary but often unavoidable soil will also be generated due to non-tillage measures such as harvesting, transportation, spraying and even compaction by the tractor during normal farming