不同氮源对烤烟漂浮育苗氮素利用及烟苗生长的影响  

Effects of nitrogen sources on nitrogen utilization and growth of flue-cured tobacco in the floating-seeding system

作　　者：张梦[1] 梁永江 张长华 陈小明 杨宇虹[3] 袁玲[1] 

机构地区：[1]西南大学资源环境学院,重庆400716 [2]贵州省遵义市烟草公司,遵义563000 [3]云南省烟草研究所,云南玉溪653100

出　　处：《植物营养与肥料学报》2012年第1期139-145,共7页Journal of Plant Nutrition and Fertilizers

基　　金：贵州省烟草公司遵义市公司科技攻关项目(2007-01);贵州省烟草公司科技攻关项目(2006-04)资助

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。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 utiliza- tion 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： NHnNO3 ≈ （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 NO~ -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.

关 键 词：烤烟 漂浮育苗 氮形态 氮素利用率 

分 类 号：S572[农业科学—烟草工业]