Interaction of Different Wheat Genotypes and Nitrification Inhibitor 3,4-Dimethylpyrazole Phosphate Using 15N Isotope Tracing Techniques |
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| Authors: | Mir Ahmad Mousavi Shalmani Reza Khorassani Kazem Khavazi Mohammad Zaman |
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| Affiliation: | 1. Soil Science, PhD student, Ferdowsi University of Mashhad, Researcher at Nuclear Science and Technology Research Institute, Karaj, Iran;2. Soil Science, Ferdowsi University of Mashhad, Mashhad, Iran;3. Soil Biology, Soil and Water Research Institute, Tehran, Iran;4. Soil and Water Management and Crop Nutrition Department, International Atomic Energy Agency, Vienna, Austria |
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| Abstract: | ![]()
To investigate the effect of applying 15N-labeled ammonium sulfate with or without a nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on fertilizer use efficiency and crop productivity of different wheat genotypes, a field trial was conducted at the Nuclear Agricultural Department’s farm of Iran in 2013–2014. The treatments included five wheat genotypes with different 13 C isotope discrimination and three fertilizer treatments, an unfertilized control, 15N-labeled ammonium sulfate, and 15N-labeled ammonium sulfate with DMPP in three replications. Soil samples were taken after 2, 4, and 6 weeks after sowing and also at harvest time. Results from 15N experiment showed that DMPP delayed nitrification of ammonium for 42 days. Genotypes with lower discrimination index had greater uptake of ammonium ions which led to increase crop yield and nitrogen fertilizer use efficiency. The results also suggested that the use of DMPP may not be beneficial in some fast growing wheat genotypes. |
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| Keywords: | 13C isotope ammonium fertilizer use efficiency nitrate nitrification inhibitor nitrogen-15 |
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