Ammonia Emissions from Anaerobicallydigested Slur

Authors: Hong Hou Sheng Zhou Masaaki Hosomi Koki Toyota Kiori Yosimura Yuuko Mutou Taku Nisimura Masao Takayanagi Takashi Motobayashi

Publish Date: 2007/02/10

Volume: 183, Issue: 1-4, Pages: 37-48

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Abstract

Ammonia fluxes from application of anaerobicallydigested slurry ADS and chemical fertilizer CF to flooded forage rice Oryza sativa L in Japan were measured using a dynamic flowthrough chamber method in lysimeters The CF was applied at a rate of 300 N ha−1 three times as ammoniacalN fertilizer and the ADS was applied to the lysimeters at total rates equivalent to 75 100 and 150 kg N ha−1 by broadcasting uniformly into the floodwater at three or six times equal splits between 17th June and 17th November 2005 The emission fluxes for the first 2 days after application were very high from ADS the highest values being 679 compared with a maximum of 156 mg N m−2 d−1 from CF Most 61–93 of the ammonia loss occurred during the first 5 days after each application of fertilizer The total N loss as ammonia from ADS 296–517 was much higher than from CF 122 The highest fluxes were observed in August 2005 when air temperature was highest More ammonia was lost from the ADS applied at the early stages ie root taking tiller stages than at later stages ie elongation fruiting stages of rice growthThis research was conducted as part of the Nitrogen Cycle task force of the twentyfirst Century Center of Excellence Program COE Tokyo University of Agriculture and Technology We would like to K M Kyaw et al of Tokyo University of Agriculture Technology for assistance with soil properties analysis

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