title: Effects of dicyandiamide and dolomite application on N2O emission from an acidic soil.
abstract: Soil acidification is a major problem for sustainable agriculture since it limits productivity of several crops. Liming is usually adopted to ameliorate soil acidity that can trigger soil processes such as nitrification, denitrification, and loss of nitrogen (N) as nitrous oxide (N2O) emissions. The loss of N following liming of acidic soils can be controlled by nitrification inhibitors (such as dicyandiamide). However, effects of nitrification inhibitors following liming of acidic soils are not well understood so far. Here, we conducted a laboratory study using an acidic soil to examine the effects of dolomite and dicyandiamide (DCD) application on N2O emissions. Three levels of DCD (0, 10, and 20 mg kg(-1); DCD0, DCD10, and DCD20, respectively) were applied to the acidic soil under two levels of dolomite (0 and 1 g kg(-1)) which were further treated with two levels of N fertilizer (0 and 200 mg N kg(-1)). Results showed that N2O emissions were highest at low soil pH levels in fertilizer-treated soil without application of DCD and dolomite. Application of DCD and dolomite significantly (P ≤ 0.001) reduced N2O emissions through decreasing rates of NH4 (+)-N oxidation and increasing soil pH, respectively. Total N2O emissions were reduced by 44 and 13% in DCD20 and dolomite alone treatments, respectively, while DCD20 + dolomite reduced N2O emissions by 54% when compared with DCD0 treatment. The present study suggests that application of DCD and dolomite to acidic soils can mitigate N2O emissions.
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China. shabanbzu@hotmail.com.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Shaaban
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Wu
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
authors.forename: Qi-an
authors.initials: QA
authors.lastname: Peng
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
authors.forename: Shan
authors.initials: S
authors.lastname: Lin
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.|Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, People's Republic of China.
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Mo
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wu
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China. rghu@mail.hzau.edu.cn.
authors.forename: Ronggui
authors.initials: R
authors.lastname: Hu
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
mesh_terms: D000383:Agriculture; D002119:Calcium Carbonate / Q000737:chemistry*; D058440:Denitrification; D005308:Fertilizers / Q000032:analysis; D006146:Guanidines / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008274:Magnesium / Q000737:chemistry*; D058465:Nitrification; D009609:Nitrous Oxide / Q000032:analysis*; D012987:Soil / Q000737:chemistry*
chemical_list: D005308:Fertilizers; D006146:Guanidines; D012987:Soil; D002119:Calcium Carbonate; D008274:Magnesium; D009609:Nitrous Oxide; C004711:dicyandiamido; C028042:calcium magnesium carbonate
keywords: Acidic soil; Dicyandiamide; Dolomitic lime; Nitrification; Nitrous oxide; Soil pH