【摘要】 研究结果表明:有机质含量高的土壤供氮能力强,烟株农艺性状和干物质重存在明显优势,烟株在生育前期以吸收积累肥料氮为主,生育后期土壤以吸收积累土壤氮为主。而在有机质含量低的土壤上,烟株在整个生育期均以吸收积累肥料氮为主。随叶位的升高,土壤氮在烟叶积累氮量中所占的比例逐渐升高,而肥料氮所占比例逐渐下降。在有机质含量高的土壤上,来源于土壤的氮素在各部位叶中所占的比例均大于肥料氮所占的比例,而在有机质含量低的土壤上,肥料氮所占比例在各部位叶中均大于土壤氮。后期过量的氮素供应致使上部叶烟碱含量超高积累,而总糖和还原糖含量严重偏低;有机质含量低的土壤在烤烟生育期内矿化出的无机氮较少,土壤供氮能力较弱,烟株及上部叶以吸收、积累肥料氮为主。更多还原

【Abstract】 The results indicated that the mineralized nitrogen from organic matter was massive in the soil of high organic matter content at the whole stage, so the ability of nitrogen supply of soil was strong, and the agriculture character and the weight of dry matter in plant have a obvious predominance. The nitrogen accumulated in plant and upper leaf was mainly from nitrogen fertilizer at former stage, and the nitrogen accumulated in plant and upper leaf was mainly from soil nitrogen at latter stage. The higher nicotine content, lower total carbohydrate content and reduced carbohydrate content of upper leaf were caused by the excess nitrogen supply at latter stage. The nitrogen mineralized from organic matter was little at growth stage in the soil of low organic matter content, so the ability of nitrogen supply was weak, and the nitrogen accumulated in plant and upper leaf was mainly from nitrogen fertilizer.更多还原