在深耕增产的大量事实面前,为什么也会有个别的深耕反而减产呢?(例如1957年后河乡胜利一社,第七生产队用“深翻条播”的方法,深翻了一亩玉米地,深一尺半,亩产达到1,316斤,但是,第二生产队也是用深翻条播“的方法,翻了一亩半玉米地,深度也是一尺半,土质、施肥、浇水都一样,亩产只合 In the face of a large number of deep plowing and yielding facts, why do some deep plowing instead reduce it? (For example, after 1957, Hsiang Hsiang-hsien I Club, the seventh production team used ”deep plowing and sowing“ method, Corn fields, one and a half feet deep, yield 1,316 pounds per mu, but the second production team is also a deep plowing broadcast ”method, turn over a half acres of corn, the depth is one and a half, soil, fertilization, watering All the same, only a mu yield