旋耕作业法虽具有许多优点,但从试验结果看出,一般连续旋耕4年,就有减产的趋势。因此旋耕要与犁耕相配合,即旋耕两三年,犁耕一年。这是因为目前的旋耕机,其耕深一般为12厘米左右,长期浅耕,会使耕层下部趋于免耕化,造成土地漏水、漏肥。对于严重漏水的稻田,不宜进行旋耕作业。 Although the rotary tillage method has many advantages, it can be seen from the test results that the general trend of rotary cutting is 4 years of continuous reduction. Therefore, rotary plowing and plowing to be matched, that rotary two or three years, plowing for one year. This is because the current rotary tillers have a plow depth of about 12 centimeters. Long-term shallow plowing will tend to tillage the lower part of the plow layer, causing water leakage and leakage of fertilizers. For serious leakage of paddy fields, should not be rotary farming operations.