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| Effects of nitrification inhibitors on nitrification rate of urea in four typical tea soils |
| Received:April 03, 2017 |
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| KeyWord:nitrification inhibitors;tea soil;net nitrification rate;nitrification inhibition rate |
| Author Name | Affiliation | E-mail | | WU Xiao-rong | Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province, College of Geography and Environment, Baoji University of Art and Sciences, Baoji 721013, China | | | ZHANG Bei-bei | Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province, College of Geography and Environment, Baoji University of Art and Sciences, Baoji 721013, China | zbb83101@126.com | | YU Yun-fei | Jiangsu Agriculture Commission, Nanjing 210036, China | | | HUANG Rong | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | YAN Ming-juan | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | NI Kang | Tea Research Institute, Chinese Academy of Agriculture Sciences, Hangzhou 310008, China | | | CUI Jing-ya | School of Environment | | | WANG Shen-qiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CHENG Yi | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | ycheng@issas.ac.cn |
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| Abstract: |
| A laboratory incubation study over a 28-day period at 25℃ and 60% water holding capacity in China was conducted to determine the effect of nitrification inhibitors on nitrification rates in four typical tea soils(pH 3.32~3.54). The experiment included five treatments applied on an equivalent N basis:(1) CK, soil+urea (100 mg N·kg-1); (2) 2% DCD(Dicyandiamide), soil+urea+2% DCD; (3) 10% DCD, soil+urea+10% DCD; (4) 0.27% Nitrapyrin(2-chloro-6-(trichloromethyl) pyridine), soil+urea+0.27% Nitrapyrin; (5) 0.54% Nitrapyrin, soil+urea+0.54% Nitrapyrin. Both nitrification inhibitors were applied at recommendation rates. The results showed that inhibitory effect of DCD decreased with incubation time in the four tea soils, and the high concentration of DCD showed a stronger inhibitory effect than the low concentration only on the 28th day. After 28 days of incubation, both rates of DCD reduced nitrification by 12.15%~59.68% in Anxi and Yixing tea soils, while the inhibitory effect disappeared in Hangzhou and Langxi tea soils regardless of DCD concentration. In general, DCD inhibition effects over 28 d incubation ranked as Yixing soil > Anxi soil > Hangzhou soil > Langxi soil. Compared with DCD, Nitrapyrin completely inhibited net nitrification in the four tea soils during the whole experiment period regardless of the concentration of Nitrapyrin, indicating that Nitrapyrin could effectively inhibit the nitrification of tea soils during the 28 days of incubation. Overall, Nitrapyrin is a more efficient nitrification inhibitor for tea soils. |
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