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作 者 ：张梦 梁永江 张长华 陈小明 杨宇虹 袁玲

期 刊 ：植物营养与肥料学报 2012年 18卷 1期 页码：139-145

关键词：烤烟；漂浮育苗；氮形态；氮素利用率；

Keywords:flue-cured tobacco, floating-seeding system, nitrogen forms, nitrogen utilization efficiency,

摘 要 ：采用水培漂浮育苗的方法，研究4种氮源（硝态氮、铵态氮、酰胺态氮、硝酸铵）对烤烟漂浮育苗系统中氮的利用状况。结果表明，在烤烟漂浮育苗系统中，氮的表观利用率由高到低依次为：硝态氮源＞酰胺态氮源＞硝酸铵＞铵态氮源；氮的实际利用率表现为前三种氮源之间无显著差异，但它们均显著高于铵态氮；烟苗根系活力、光合色素含量、木质化程度等壮苗指标是以硝酸铵、酰胺态氮为氮源的效果显著高于单纯的硝态氮。尿素添加少量的硝态氮是烤烟漂浮育苗培养壮苗最佳的氮源选择。

Abstract:The utilization of four different forms of nitrogen, NO3--N, NH4+-N, (NH2)2CO-N and NH4NO3, in the flue-cured tobacco floating-seeding system was studied. The results indicate that the highest N apparent utilization efficiency is in the NO3--N flue-cured tobacco floating-seeding system, and is followed by the (NH2)2CO-N, NH4NO3 and NH4+-N systems. The N actual utilization efficiency is in the order: NH4NO3≈(NH2)2CO-N≈NO3--N＞NH4+-N. Tobacco seedling indices, such as root activity, photosynthetic pigment content and degree of lignification in the NH4NO3 or (NH2)2CO-N systems are significantly higher than those in the NO3--N systems. Therefore, urea plus a small quantity of NO3--N could be an optimum selection of N source to improve the qualities of tobacco seedlings and economic fertilization in the floating-seedling system.

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