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目前,采用测定棉株的叶片或其它器官中无机态氮、磷、钾含量来评价植株营养元素供应率的方法已经得到了广泛的应用。我们研究了长绒棉6465—B的产量与各生育期叶柄中无机态营养元素含量之间的关系。按照的方法用2％醋酸溶液进行分析,测定它的硝态氮、无机磷、硫酸盐态硫、氯、钾、钙和钠的含量。棉株样品按的方法采取。3～4叶期分析茎;蕾期分析主茎上2～3果枝基部的叶柄,开花期(大约初花后两周)分析3～4果枝基部的叶柄;成铃期分析6～9果枝基
At present, the method of evaluating the nutrient supply rate of plants by measuring the contents of inorganic nitrogen, phosphorus and potassium in leaves or other organs of cotton plants has been widely used. We studied the relationship between the yield of long-staple cotton 6465-B and the content of inorganic nutrients in the petioles at each growth stage. According to the method of analysis with 2% acetic acid solution, determine its nitrate nitrogen, inorganic phosphorus, sulfate sulfur, chlorine, potassium, calcium and sodium content. Cotton sample taken by the method. 3 ~ 4 leaf stage analysis of stems; bud stage analysis of the main stem 2 to 3 fruit branches at the base of the petiole, flowering (about two weeks after the first flower) analysis 3 ~ 4 fruit branches at the base;