棉花严重缺硼的重要症状之一,是叶柄出现暗绿色环带。当棉花轻度缺硼时,其他症状不易发生,外形与正常棉株没有区别,但叶柄环带仍明显出现。因此,我们曾提出以叶柄环带作为棉花轻度缺硼的主要形态指标。棉花缺硼发生叶柄环带,国外已有报道,将其称为暗绿带、暗色外环、绿环、带 One of the important symptoms of severe boron deficiency in cotton is the emergence of dark green annulus on the petiole. When cotton is mildly boron-deficient, other symptoms are not easy to occur and the appearance is not different from that of normal cotton plants, but the petiole annulus is still evident. Therefore, we have proposed petiole annulus as the main morphological index of light boron deficiency in cotton. Petioles occur in cotton boron deficiency, has been reported abroad, it is called dark green belt, dark outer ring, green ring, belt