在七十年代,谷物种植者趋向于直接播种和少耕作业,以便最大限度地增加冬季作物的面积,这时犁的使用处于下降的境况。现在犁又恢复了它作为初耕的机具。这是由于少耕作业引起的四个主要问题的结果。这四个问题是:杂草蔓延程度增加 In the seventies cereal growers tended to plant and tillage crops directly in order to maximize the winter crop area, at a time when the use of plows was declining. Now the plow has resumed its use as a cultivator. This is the result of four major problems caused by less-farming operations. These four questions are: the extent of weeds spread