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<正> 氮素是影响烟株生长和发育以及烟叶质量的最重要的元素。烟叶内的烟碱、醚提物和蛋白质含量及它们之间的比例是影响烟叶内在质量的关键因素。这些化合物的含量与施氮量及施用肥料种类密切相关。烟草对氮素的需求规律为“少时富、老来贫”,
配施芝麻饼肥对烟叶含氮化合物中氮素来源的影响
【摘 要】
：
<正> 氮素是影响烟株生长和发育以及烟叶质量的最重要的元素。烟叶内的烟碱、醚提物和蛋白质含量及它们之间的比例是影响烟叶内在质量的关键因素。这些化合物的含量与施氮量
【机 构】
：
河南农业大学;
【发表日期】
：
2004年期
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<正>尊敬的大会主席,各位同仁,大家好:很高兴与大家相聚在这里,共同学习"脊柱定点锤正复位法"。我1983年师承中国道教龙门派著名医家王道平老师(我本家大爷),学习草医药知识
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