摘要
本试验研究了硫脲(TU,0.1%,0.3%,0.5%,1.0%,5.0%)不同浓度对土壤脲酶活性、土壤尿素氮转化的影响。室内培养表明,硫脲既是一种弱脲酶抑制剂又是一种硝化抑制剂。硫脲对脲酶活性和尿素水解均有显著的抑制作用,但是作用时间较短;硫脲用量为0.1%时,就起到了抑制作用,用量0.3%~1.0%之间差异不显著,用量1.0%~5.0%之间抑制效果随用量增加而加强。硫脲不仅延缓了土壤NH4+-N的释放高峰期一周,而且降低了土壤中NO3--N的富集,使NO3--N的释放高峰期向后推迟了10天。本试验条件下,土壤中的NH4+-N向NO3--N转化的时间大约为7~10天;土壤中有效氮的释放曲线主要取决于土壤NH4+-N的浓度,受NO3--N的影响次之。
We studied the effect of various concentrations of thiourea(TU,0.1%,0.3%,0.5%,1.0%,5.0%)on urease activities , transformation of urea-N in soil. Results showed that TU is a kind of weak urease inhibitor as well as a nitrification inhibitor. TU inhibited urease activity and urea hydrolysis effectively in a short time. It was effective when its application rate was 0.1%, and no difference was found between 0.3-1.0%, but the effect increased from 1.0%-5.0%. TU delayed not only the release fastigium of NH4+-N for about a week, but also decreased the enrichment of NO3--N and postponed the transformation time of NO3--N for about 10 days. It needs about 7-10 days that NH4+-N was transformed to NO3--N in soil, and the concentration of available-N depended on the concentration of NH4+-N firstly and concentration of NO3--N secondary under the condition of incubation test.
出处
《土壤通报》
CAS
CSCD
北大核心
2003年第6期554-557,共4页
Chinese Journal of Soil Science
基金
国家农业科技成果转化基金项目-长效复合肥添加剂中试(课题号:KI3CBCG2H2020)