生长期追施氮肥对烤烟氮积累与分配的影响

Effect of topdressing nitrogen on nitrogen cumulation and distribution of flue-cured tobacco in growing season

在田间试验条件下,研究了当地常规施氮肥(对照N1)、根外追施硝酸铵(N2)、根外追施硝酸钠(N3)3个处理的根、茎、叶氮积累以及分配规律,随机区组试验设计,3次重复。结果表明:烤烟各器官在生育前期氮积累量不同处理之间均无显著差异,收获期不同处理间存在显著差异;N3处理根、茎、下部叶、中部叶、上部叶内氮积累量分别高于N1处理28.98%、12.72%、4.46%、44.73%、7.27%;N2处理根茎分别高于N1处理11.14%、41.92%,下部叶、中部叶、上部叶分别低于N1处理18.23%、9.73%、8.99%;N3处理有利于氮在中上部叶内的分配,N2处理有利于氮在茎和上部叶内的分配。综合分析认为,在前作为玉米的田地上,黑钙土地区采用根外追肥的方式可以满足烤烟对氮素营养的需求,硝酸钠处理效果最佳。

The test under field conditions studied the laws of nitrogen accumulations, and distributions in root, stem, leaf under local conventional nitrogen（N1）, outside the root topdressing ammonium nitrate（N2）, outside the root topdressing NAN03 （N3） and plot experimental design with three replications each treatment. The results showed that： each treatment＇s flue-cured tobacco various organs nitrogen accumulation had no significant difference in early growth stage, in harvest every treatment had significant differences; N3 treatment＇s roots, stems, lower leaves, middle leaves, upper leaves nitrogen accumulation were respectively higher than N1 treatment by 28.98% ,12.72% ,4.46% ,44.73% ,7.27% ;N2 treatment＇s roots and stems were respectively higher than N1 treatment by 11.14%,41.92%,lower leaves, middle leaves, upper leaves were respectively lower than N1 treatment by 18.23% ,9.73% ,8.99% ;N3 treatment inproved nitrogen distribution to middle leaves and upper leaves, N2 treatment improved nitrogen distribution to stems and upper leaves. Comprehensive analysis showed that foliage spray could fill the needs of nitrogen nutrition flue-cured tobacco in chernozem region and corn stubble, and NaNO3 treatment was best.