[Effects of urease/nitrification inhibitors on soil available N and microbial biomass N and on N uptake of wheat].
With an aquic brown earth as test soil, this paper studied the effects of urease inhibitor (NBPT), nitrification inhibitor (DCD) and their combinations on the dynamics of soil available N and microbial biomass N. The results showed that the treatments of inhibitors, especially the combined application of NBPT and DCD, could increase soil NH4+-N by 2%-53%, inhibit NH4+ oxidation, decrease soil NO3(-)-N concentration, increase soil total available N by 34%-44%, and increase wheat N uptake by 0.26%-6.79%. The best treatment was urease inhibitor combined with nitrification inhibitor. The application of inhibitors increased soil microbial biomass N immobilization at the early growth stage of wheat, and promoted soil N mineralization at filling stage.
Jiao
Xiaoguang
X
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. xgjiao76@sohu.com
Liang
Wenju
W
Chen
Lijun
L
Jiang
Yong
Y
Wen
Dazhong
D
D000641:Ammonia / Q000032:analysis / Q000378:metabolism; D009566:Nitrates / Q000032:analysis / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D009943:Organophosphorus Compounds / Q000494:pharmacology*; D012988:Soil Microbiology; D014908:Triticum / Q000254:growth & development / Q000378:metabolism*; D014510:Urease / Q000037:antagonists & inhibitors*
C120049:N-(n-butyl) thiophosphoric triamide; D009566:Nitrates; D009943:Organophosphorus Compounds; D000641:Ammonia; D014510:Urease; D009584:Nitrogen