北安农场管理局所属14个农场,耕地423万亩。多年来,土壤耕作以铧式犁连翻为主。近年推广少耕法,即把原来的铧式犁连翻改成耙茬、松耙、深翻相结合的少耕法,实现了三年一翻。但在应用少耕法时,应注意两个问题:1.土壤含水量过大,耙茬比翻地减产。黑土土壤水分超过48%时,不宜采取耙茬作业。如1983年秋涝,1984年调查,表现在大豆上,秋耙茬与秋翻相比,秋耙茬减产12.7%;春耙与秋翻相比,春耙减产21%.表现在小麦上,1984年调查了57个地 Bei’an Farm Authority owned 14 farms, 423 acres of arable land. Over the years, the soil plow has been dominated by the plow. In recent years, the promotion of less tillage, that is, the original plow even turn into stubble, loose rake, deep plowing combination of less tillage, achieved a double in three years. However, in the application of less tillage, should pay attention to two issues: 1. Soil moisture is too large, rake stubble overturning production. Black soil soil moisture more than 48%, should not be taken stubble operation. For example, the autumn flood in 1983 and the survey in 1984 showed that the autumn stubble was reduced by 12.7% compared with the autumn stubble, while the spring rake was reduced by 21% compared with the autumn stubble. In the survey of 57 places