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棉花是对硼素较为敏感的作物之一,当其严重缺硼时,会导致“蕾而不花”,从外部形态上较易识别,但实际上在未发生此现象之前,棉花产量就已受到损失。那么,怎样在蕾而有花(即潜在性缺硼)时判断棉花是否缺硼且科学地施硼呢? 一、棉花潜在性缺硼的特点。土壤有效硼含量0.8ppm是棉花的缺硼临界值,而只有当土壤有效硼小于0.2ppm时,才会发生“蕾而不花”现象,在0.2—0.8ppm之间,棉花属于潜在性缺硼,即中轻度缺硼,其外部形态与正常植株没有区别,不易辩识,仅叶柄上有环带,环带部分表皮突起,使叶柄呈结节状,我们可以根据叶柄环带来确定棉花是否缺硼。二、确定棉花潜在性缺硼的方法。当棉花生育到蕾期,在田间五点取样,每个点为10株棉花,数出主茎叶
Cotton, one of the more boron-sensitive crops, causes “buds without flowers” when they are severely boron-deficient and more easily identifiable from the outside, but in fact cotton yields have been affected before this occurs loss. So, how to judge whether cotton is deficient in boron and scientifically apply boron when it has buds and flowers (that is, potential boron deficiency)? The potential of boron deficiency in cotton. The effective boron content of soil 0.8ppm is the critical boron deficiency of cotton, but only when the soil available boron is less than 0.2ppm, the phenomenon of “bud without bloom” occurs. Between 0.2-0.8ppm, cotton is a potential boron deficiency , That is, mild boron deficiency, the external morphology and no difference between normal plants, not easy to identify, only the petiole ring, part of the epidermis protuberance, petiole nodular, we can determine the petiole ring cotton Whether the lack of boron. Second, determine the potential of cotton boron deficiency method. When the cotton to the bud stage of fertility, five samples in the field, each point of 10 cotton, counting the main stems and leaves