英国霍华德旋耕机公司和帝国化学工业公司植物保护部的土壤学家共同研制了一种新型松土犁(图1),称霍华德保护松土犁(Howard paraplow),以满足用新方法生产作物的需要。由于使用大型拖拉机和联合收割机越来越广泛,使土壤压实越来越严重,为此,设计了这种松土犁,以疏松压实的土壤,使地表相当平整,适合于浅耕法和免耕法或直接播种。 A new type of loosening plow (Figure 1) was developed jointly by the British Howard Rotary Machine Company and soil scientists at the Plant Protection Division of the Imperial Chemical Industries, claiming that Howard protected the plow (plow) to meet the needs of new methods of producing crops Need. Due to the ever-increasing use of large tractors and combine harvesters, the compaction of the soil is becoming more and more severe. To this end, this plow has been designed to loosen compacted soils that are relatively flat and suitable for shallow tillage And no-till or direct seeding.