3, 4-Dimethylpyrazole phosphate reduces nitrous oxide emissions from grassland after slurry application

• Published in: Soil use and management 2005-03, Vol.21 (1), p.53-57
• Main Authors: Merino, P, Menendez, S, Pinto, M, Gonzalez-Murua, C, Estavillo, J.M
• Format: Article
• Language: English
• Subjects: 3,4-dimethylpyrazole phosphate; Agronomy. Soil science and plant productions; ammonium nitrogen; autumn; Biological and medical sciences; cattle manure; Chemical, physicochemical, biochemical and biological properties; crop production; forage grasses; Fundamental and applied biological sciences. Psychology; gas emissions; General agronomy. Plant production; grassland soils; manure spreading; nitrification inhibitors; nitrous oxide; nutrient uptake; Organic matter; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; Physics, chemistry, biochemistry and biology of agricultural and forest soils; pyrazoles; seasonal variation; slurries; soil fertility; soil nutrients; Soil science; Soil-plant relationships. Soil fertility. Fertilization. Amendments; spring
• ISSN: 0266-0032; 1475-2743
• DOI: 10.1079/SUM2005292

A field study was conducted to assess the effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP), applied at a rate of 1 kg ha-1, on nitrous oxide (N2O) emissions, forage production and N extraction from a grassland soil after cattle slurry applications in autumn and spring. Nitrous oxide emissions were measured daily or weekly using the closed chamber technique. DMPP efficiency after slurry application was lower in spring (16.7 °C mean soil temperature) than in autumn (11.4 °C mean soil temperature). Thus, DMPP was able to maintain soil mineral N in the ammonium form for 22 days and reduce cumulative N2O emissions by 69% in autumn, while in spring its effect on soil mineral N lasted for 7-14 days, reducing cumulative N2O losses by 48%. Furthermore, application of DMPP after slurry did not decrease biomass yield or N uptake.