“S”形播种法的应用与推广

• 作 者: 胡健
• 出 处: 农村机械化
• 发表日期: 2000年04期
• 关键词: 播种法 直线形 引水灌溉 条田 沟壑 坡度 横线 为宜 行距 斜线

我国西北地区,由于地貌的自然形成,大多数耕地属山坡地,地势坡度较大,一般多采取传统的顺坡直线形播种轨迹,直而陡的播种轨迹对水流的阻力很小,而水对土地的渗透力较差,特别像冬季积雪的快速融化,暴雨和引水灌溉,都会造成水土的大量流失。这是由于水流由上而下,流速不断加快,冲

In northwestern China, due to the natural formation of landscapes, most of cultivated land belongs to hillsides and has a steep terrain gradient. Generally, traditional sowing straight-line sowing trajectories are adopted, and the steep sowing trajectory has little resistance to water flow. However, The infiltration of land is poor, especially as rapid melting of snow in winter, heavy rain and diversion irrigation, will result in a large loss of water and soil. This is because the water flow from top to bottom, the flow rate continues to accelerate, red