【摘要】 以烤烟（Nicotiana tabacum L.K 326）为试验材料.在大田条件下,利用¹⁵N示踪法,研究了土壤氮对烤烟氮素累积和烟碱合成的影响。结果表明。对烤烟氮素累积和烟碱合成的影响。土壤氮比例均随叶位上升而上升,且打顶后上、中、下三个叶位和根茎中土壤氮比例均随生育时期推进而显著增加;打顶后烤烟各器官的土壤氮占总氮比例和占总烟碱氮比例分别为50%和60%。显著高于肥料氮。更多还原

【Abstract】 In this work,flue-cured tobacco cuhivar（Nicotiana tabacum L.K 326）was used to study the effect of soil- N on nitrogen and nicotine accumulation in flue-cured tobacco using the N¹⁵-trace method in a field experiment.The re- suits indicated that soil-N proportion to total N and that in nicotine in leaves increased with the increased leaf position （down to up）.Also soil-N proportion to total N in different organs of tobacco plants increased with the prolonged growth duration,especially after removing of the shoot apex.Soil-N in all organs of plants after removing of the apex accounted for 50% and 60% of total N and nicotine-N,respectively.更多还原