Effects of urease/nitrification inhibitors on soil available N and microbial biomass N and on N uptake of wheat
Jiao, X.; Liang, W.; Chen, L.; Jiang, Y.; Wen, D.
Ying Yong Sheng Tai Xue Bao 15(10): 1903-1906
2004
ISSN/ISBN: 1001-9332 PMID: 15624832 Document Number: 569962
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 % apprx 53 %, inhibit NH4+ oxidation, decrease soil NO3--N concentration, increase soil total available N by 34% apprx 44%, and increase wheat N uptake by 0.26% apprx 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.