在耕作作业中常采用内翻法、外翻法及内外翻交替法。如处理不当，作业后往往留下］河垄台或开垄沟。现介绍处理开闭垄的两种方法供参考。1．内翻法：在开墒前首先治中心线处向两侧各翻一犁，使中间形成一个犁沟，再把两侧所翻的土重新犁回原处，填平犁沟；然后再按顺时针方向绕 In farming operations are often used varus method, valgus method and the method of alternating valleys. If handled improperly, often left behind after work] River ridge ditches or ditches. Are introduced to deal with the two kinds of open-close ridge for reference. 1. Inversion method: Before opening the moisture treatment centerline at the first turn to a plow on both sides, so that the middle form a furrow, and then turn the soil on both sides of the plow back to the original place, fill the furrow; and then press Winding clockwise