前言 东北地区自1950年推广新式农具后普遍实行了小麦平作,多年来証明比用旧式农具壠作增产。1952年以来又逐漸使用新式平作农具耕种壠作的大田中耕作物,并相应創造了多种平壠結合的耕作方法和改装了一部分农机具。但是由于平作农具不是为壠作設計的,使用平作农具和改装机具不能全面滿足壠作的农业技术要求,甚至还造成减产。近 Preface The northeastern region has generally implemented cropping of wheat since the promotion of new farm tools in 1950 and has proved more for years than it does for the use of old farm implements. Since 1952, they have gradually used the new crop cultivators in the field to cultivate cultivated fields in the fields, and have accordingly created various methods of farming with flat knuckles and converted some farm implements. However, since flat-type implements are not designed for operation, the use of flat-type implements and conversion equipment can not fully meet the technical requirements of agricultural production and even reduce production. near