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本文在研究确定旱田土壤碱解氮侧定方法的基础上,采用室内化学分析,~(15)N示踪盆栽试验与质谱分析,对吉林省29种旱田土壤的供氮性能进行了观察研究。结果表明:碱解氮同玉米生物产量及土壤其它形态氮素间呈显著正相关,同施氮增产百分数呈显著负相关;其含量平均为土壤全氮量的9％,接近常数;在施氮盆栽条件下玉米对碱解氮的利用率为40％左右,对碳铵的利用率为37.5％,二者相接近。由此认为以碱解氮作为旱田土壤供氮能力的指标是可靠又合适的。
Based on the study of the determination methods of soil available nitrogen in dryland soil, nitrogen application performance of 29 kinds of dryland soil in Jilin Province was studied by using indoor chemical analysis, ~ (15) N tracing pot experiment and mass spectrometry analysis. The results showed that there was a significant positive correlation between the yield of alkali hydrolyzable nitrogen and the biomass of corn and other forms of nitrogen in soil, and negatively correlated with the percentage of increase of nitrogen application. The content of nitrogen was about 9% of the total nitrogen in soil, Under potted condition, the utilization rate of maize to alkali-hydrolyzed nitrogen is about 40% and the utilization rate to ammonium bicarbonate is 37.5%, which are close to each other. This suggests that it is reliable and appropriate to use nitrogen as an index of nitrogen availability in upland soil.