贵州省高有机质植烟土壤不同施氮量试验

目的]研究高有机质土壤条件下不同施氮量对烤烟氮积累及烟叶品质的影响.方法]田间试验按施氮量设对照处理(0 kg/ha N)、T1处理(82.5 kg/ha N)、T2处理(105 kg/haN),测定烟叶的氮积累量以及烟叶品质.结果]T2处理烟株根系氮积累量比对照提高提高35.08%,T1处理提高17.76%;烟叶内氮积累量随着施氮量增加而升高,其中低量施氮处理与对照间无显著差异,高量施氮处理显著高于对照;高量施氮处理可以提高中下部叶氮分配比例,降低上部叶氮分配比例;高量施氮处理对降低烟叶氯含量、提高钾含量效果最佳.结论]贵州高有机质土壤条件下,施氮105 kg/ha有利于提高烤烟氮积累和烟叶品质.

Experiment on different nitrogen application rates in high organic soil for planting tobacco in Guizhou Province

【Objective】The current experiment was conducted to study the effects of different nitrogen application rates on nitrogen accumulation and leaf quality of flue-cured tobacco planting in high organic tobacco soil. 【Method】In field test， 3 treatments viz.， the control（0 kg/ha N）， T1（82.5 kg/ha N）and T2（105 kg/ha N）were designed to determine nitrogen accumulation and the quality of flue-cured tobacco leaf. 【Result】Compared to the control， nitrogen accumulation in roots of T2 and T1 treatments rose by 35.08 and 17.76%， respectively. The more nitrogen application rates was， the higher accumulation was in tobacco leaves. No significant difference was found between the low nitrogen rate treatment and the control， whereas the nitrogen accumulation in leaves of high nitrogen rate treatment was significantly higher than that of the control. Under the high nitrogen rate treatment， the proportion of nitrogen allocation in the middle and lower leaves was increased and that in the upper leaves was decreased. The high nitrogen rate treatment proved to be best in decreasing chlorine content and increasing potassium content in tobacco leaves. 【Conclusion】In high organic tobacco soil of Guizhou Province， applying nitrogen at the high rate of 105 kg/ha could increase nitrogen accumulation in flue-cured tobacco leaves and produce best tobacco leaves.