title: [Effects of 3,5-dimethylpyrazole phosphate (DMPZP) on soil nitrification].
abstract: With aerobic incubation test, this paper studied the effects of 3,5-dimethylpyrazole phosphate (DMPZP) on soil nitrification, taking dicyandiamide (DCD) as reference. The results indicated that when the dosage was 1.0% of applied N, DMPZP could significantly inhibit the oxidation of soil ammonium, increase soil NH4+ -N concentration, and decrease soil NO3- -N concentration. The inhibitory effect of DMPZP increased with its increasing dosage. DCD showed a higher efficacy when its dosage was the same with DMPZP, but a lower efficacy when the DMPZP was applied two-fold. However, the efficacy of equimolar DMPZP was significantly higher than that of DCD, because of the smaller molecular weight of DCD. The highest inhibitory effect of DMPZP was observed during the period of 7-14 days after its application, with an inhibition rate higher than 30%. Compared with the control, the apparent inhibition rate was decreased by 29.3% and 41.7% on the 7th day, and by 18.6% and 34.3% on the 14th day when the application rate of DMPZP was 1.0% and 2.0% of applied N, respectively. DMPZP could also slow down the falling rate of soil pH, but no significant difference was observed between the treatments of applying DMPZP and DCD.
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. shiyunfeng8189@sina.com
authors.forename: Yun-feng
authors.initials: YF
authors.lastname: Shi
authors.forename: Zhi-jie
authors.initials: ZJ
authors.lastname: Wu
authors.forename: Li-jun
authors.initials: LJ
authors.lastname: Chen
authors.forename: Zhi-mei
authors.initials: ZM
authors.lastname: Sun
mesh_terms: D000383:Agriculture; D004787:Environmental Pollution; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005308:Fertilizers; D009566:Nitrates / Q000032:analysis / Q000037:antagonists & inhibitors; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D009943:Organophosphorus Compounds / Q000494:pharmacology; D011720:Pyrazoles / Q000494:pharmacology*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis; D014876:Water Pollution / Q000517:prevention & control
chemical_list: C433304:3,4-dimethylpyrazole phosphate; C524671:3,5-dimethylpyrazole phosphate; D005308:Fertilizers; D009566:Nitrates; D009943:Organophosphorus Compounds; D011720:Pyrazoles; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D009584:Nitrogen