The Fate of Ammonium Nitrogen Applied to Flooded Rice as Affected by Zeolite Addition
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概要
- 論文の詳細を見る
High rice (Oryza sativa L.) yields are closely related to plant absorption of a large amount of nitrogen (N). However, there is little information on the fate of N applied at the middle growth stages of rice. Labeled ^<15>N ammonium sulfate was applied at the panicle formation stage in Experiment I, and 10 d after heading in Experiment II. Zeolite was also added at the concentration of 0, 0.01, and 0.1 kg kg^<-1> to increase the cation exchange capacity (CEC) of the soil. The amount of ^<15>N fertilizer in the soil surface water decreased exponentially and the fertilizer disappeared within 2 d after application. The soil that received zeolite at 0.1 kg kg^<-1> exhibited significantly less ^<15>NH_4^+-N in the surface water and in the soil solution than the soil without the zeolite amendment. A significantly larger amount of exchangeable ^<15>NH_4^+-N was observed in the high zeolite-treatment of soil compared to the low zeolite-treatment of soil. The amount of exchangeable ^<15>NH_4^+-N increased initially, and thereafter, decreased to traces 4 d after application in Experiment I, while 6 or 9 d after application in Experiment II. The disappearance of exchangeable ^<15>NH_4^+-N could be attributed mainly to the uptake by plants. The zeolite amendment or the time of N application did not significantly affect the amount of immobilized N. The rate of N adsorption was inhibited with increasing zeolite application. Moreover, zeolite application did not increase the recovery percentage of ammonium sulfate by rice plants. The total recovery of applied N ranged from 65 to 75%, irrespective of the zeolite treatments or the time of N application.
- 社団法人日本土壌肥料学会の論文
著者
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Ando Ho
Faculty Of Agriculture Kagawa University
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Kakuda Ken-ichi
Faculty Of Agriculture Yamagata University
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Wada G
Nippon Koei Co. Ltd.
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Wada Genshichi
International Rice Research Institute
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Mihara Chikako
Faculty of Agriculture, Yamagata University
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Wada Genshichi
Nippon Koei Co. Ltd.
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Mihara Chikako
Faculty Of Agriculture Yamagata University
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