美国从1981年开始已有部分棉农采用大容量高精度检验仪器(HVI)对棉花进行分级,到1990年,逐渐形成当今美国所有棉花都要使用 HVI 系统进行分级检验的局面。通过大容量、高精度仪器测定可得到如下几项质量指标:长度,是一般纤维的平均长度(上半部平均长度)。纤维长度主要由品种决定,但如果棉花植物生长在过高或过低温度和水分条件下或营养缺乏,则 Since 1981, some cotton farmers in the United States have already classified their cotton using HVI. By 1990, the gradual inspection of all cottons in the United States using the HVI system has gradually taken shape. By mass, high-precision instrument measurement can get the following quality indicators: Length, is the average fiber length (average length of the first half). The length of the fiber is mainly determined by the variety, but if the cotton plant grows too high or too low in temperature and moisture conditions or undernourished