江淮流域棉区，土质以下属黄土为主，在土壤养分上形成了“低氮、低磷，中钾、硼、钼、锌”的格局。近年来，由于棉花偏施氮、磷、钾肥，忽略了硼肥的施用，土壤硼素长期只用不补，导致棉花缺硼现象十分普遍。棉花缺硼时叶柄短而粗，主茎中部叶柄或果枝叶柄出现暗绿色的凸... In the cotton area of ​​the Yangtze-Huaihe River basin, the loess is dominated by subsoil soil, forming a pattern of “low N, low P, medium K, boron, molybdenum and zinc” in soil nutrients. In recent years, due to the partial application of nitrogen fertilizer, phosphorus and potassium, ignoring the application of boron fertilizers, long-term use of soil boron does not make up, leading to cotton boron deficiency is very common. Petiole short and thick cotton when boron deficiency, central petiole or fruiting branches petiole dark green convex ...