棉花在生长发育期间如果缺硼，就会造成生长点和根尖受阻，上部新生叶片小而薄并皱缩。同时边缘失绿，向上或向下卷曲呈杯状；老叶随之增大、肥厚、变脆、暗绿、无光泽、叶脉突出，叶柄短而粗，表面粗糙多毛。此外，蕾花的表现是华而不实，易脱落，一旦遇高温多雨，蒸腾量大的 If the lack of boron in the growth and development of cotton, it will cause the growth point and root tip obstruction, the upper part of the new leaves small and thin and shriveled. At the same time the edge of the green, curl upward or downward was cup; old leaves increase, hypertrophy, brittle, dark green, dull, prominent veins, short and thick petiole, rough surface hairy. In addition, the performance of the flower bud is flashy, easy to fall off, in case of high temperature and rainy, large amount of transpiration