The Effects of Different Ratios of Dicyandiamide on Influence of Urease/Nitrification Inhibitor on Urea Hydrolysis
To explore the regulation effects of different ratios of dicyandiamide (DCD) on influence of urease/ nitrification inhibitor on urea nitrogen transformation,a 112-day indoor thermostatic incubation experiment was carried out to evaluate effects of combined application of urease inhibitor,boric acid (B),and nitrification inhibitor,dicyandiamide (DCD),on nitrogen loss.Four ratios of DCD application (2％,5％,8％ and 13％,w/w) were established.The results showed that urease/nitrification inhibitor could effectively slow down the hydrolysis of urea.In 8％ and 13％ DCD treatments,the release peak of urea was postponed 7 days.The concentration of NH4+-N maintained at a high level from 14 d to the end of the incubation experiment,ranging from 148.918 to 187.105 mg/kg,which significantly limited the transformation of NH4+-N to NO3--N and decreased production of nitrate.At the end of the experiment,the concentration of NO3-N was in the range of 5.181 to 35.463 mg/kg.The combined application of boric acid and DCD was effective for more than 84 d in maintaining N in NH4 + form and reducing concentration of NO3--N.These results suggested that in 8％ DCD treatment,the concentration of NH4+ reached the highest level and remained stable,which have the greatest potential to reduce nitrogen loss.
国家科技期刊平台
NSTL
万方数据
维普
