采用通常的水平切顶方法,切去有用的甜菜内冠层是很不经济的,并且土壤、石块和残株会引起刀片堵塞,在容易磨损的砂性土壤中切刀需要经常磨刃。如果在切顶时只切掉叶子、叶柄和青皮,块根的重量可以增加12%。试验了改进切顶方法的两种机构,最 With the usual horizontal top-cut method, it is uneconomical to cut the useful beet inner canopy and the soil, stones and stumps can cause blade blockages, which require frequent sharpening in easily-wearable sandy soil. If you cut only the leaves, petioles and peels when cutting the top, the weight of the roots can be increased by 12%. Two mechanisms to improve the top cut method were tested, most