低耕农业限制了犁的使用。
一个重大的发明是可调节的支柱，通过改变刀板与横梁的距离来精确地设置犁的深度。
A major invention was the adjustable strut that could precisely set the depth of the plow by altering the distance of the blade and the beam.
《犁的纪念碑》要求一三角状地块，每边宽一英里，以轮种方式在每个边种植季节性作物。
"Monument to the Plow" called for a triangular site a mile wide on each side to be planted with seasonal crops on rotation.
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