中国水土保持科学2012，Vol.10Issue(6)：86-91,6.
施氮量对植烟土壤不同土层无机氮质量含量的调控
Regulation of soil inorganic nitrogen by applying different nitrogen rate on flue-cured tobacco-planting soil
摘要
Abstract
Different nitrogen fertilizer rate were applied in the flue-cured tobacco planting soil to evaluate the nitrogen dynamic in different soil layers at different growth stages. In field trial nitrogen fertilizer with 5 different rates were applied to soil at 3 stages before and after transplanting. Soil were sampled at 3 layers for 7 times during tobacco growth, and the soil sample were stored under refrigeration and then analyzed with flow injection analyzer. The results are as follows: the nitrate nitrogen ( NO3- -N ) content within the upper 0-20 cm was larger than the content of ammonium nitrogen ( NH4+ -N) since 6th weeks before the transplanting of flue cured tobacco and the more the nitrogen fertilizer applied, the higher inorganic nitrogen content was. The effect of nitrogen fertilizer on the inorganic nitrogen content in 0 - 20 cm depth was larger than that in 20 - 40 cm and 40 - 60 cm depth. The nitrate decreased dramatically since 7th weeks after transplanting. The varied range of ammonium was much bigger than that of nitrate, ammonium begin to fluctuate from 6th week after transplanting and waved around about 50 mg/kg for all applied nitrogen rates and in all soil layers, and a peak of ammonium content occurred in 8th week in all soil layers. The decrease of NO3-N content stopped in 7' week, and then entered into a stage of smoothly fluctuation in the range of 0 - 100 mg/kg. It was concluded that during earlier groth stages nitrogen fertilizer rates have profound impact on the inorganic nitrogen in layer of 0 - 20 cm, ammonium regulation is the critical measure for optimizing nitrogen supply in the later growth stage.关键词
施氮量/烤烟/土壤/硝态氮/铵态氮Key words
nitrogen rate/ flue-cured tobacco/ soil/ nitrate-N/ ammonium-N引用本文复制引用
化党领,张诗卉,王瑞,刘卫群,赵颖,霍光..施氮量对植烟土壤不同土层无机氮质量含量的调控[J].中国水土保持科学,2012,10(6):86-91,6.基金项目
湖北省烟草公司恩施州公司科技项目"调控烟草打顶后库源关系提高上部叶可用性研究"(0718Y2011-002) （0718Y2011-002）
