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1984—1985年在新洲、随县和华中农大农场田间和盆栽试验条件下,对不同氮素水平棉花叶柄硝态氮作为氮素营养诊断指标进行了研究。结果表明:棉花苗期各施氮处理以叶柄硝态氮作为指标进行营养诊断意义不大,而花期和铃期叶柄硝态氮与供氮
In 1984-1985, the nitrate nitrogen in the petiole of cotton at different nitrogen levels was used as a diagnostic index of nitrogen nutrition under field and pot experiment conditions in Xinzhou, Suixian and Huazhong Farm. The results showed that it is of little significance to diagnose the nutrition of cotton under nitrogen fertilizer with petiole nitrate as index, while the nitrate and nitrogen of petiole at anthesis and boll stage