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在棉花生长期间,出现叶片萎缩,蕾而不花,以及下部叶片深绿,增厚变脆;上部叶片变小,卷缩,边沿失绿;新产生的叶片也明显变小,叶片边缘和主脉失绿,反向卷曲皱缩;叶柄变粗变短,表面粗糙多毛,有浸润状暗绿色环带突起,似节节状的症状时,即可断定为缺硼,应立即施用硼肥。硼肥施用方法为:
During the cotton growing period, leaf atrophy appeared, buds did not bloom, and the lower leaves became dark green and thickened and became brittle. The upper leaves became smaller, curled, and the edges became chlorotic. Newly-produced leaves also became significantly smaller, Veins green, reverse curly folds; petiole becomes shorter and thicker, rough surface hairy, infiltrating dark green ring with protrusions, like nodular symptoms, can be concluded as lack of boron, boron fertilizer should be applied immediately. Boron fertilizer application method is: