Contribution of Nitrogen Absorption by Rice Plants and Nitrogen Immobilization Enhanced by Plant Growth to the Reduction of Nitrogen Loss through Denitrification in Rhizosphere Soil
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概要
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At the panicle formation stage, denitrification N loss in the rhizosphere soil was investigated in a pot experiment. A solution of ammonium-^<15>N was injected with a syringe at a soil depth of 50 mm to distinguish the N losses between the surface and the rhizosphere soil. Denitrification process in the pots with plants ((+)Plant) was compared with that in pots where plants were cut off at the base of the culm ((-)Plant) to evaluate the effect of plant growth on the denitrification N loss. About 50% of the applied ^<15>N was absorbed by the plants during the first 2 d after fertilizer application (DAF) in the (+)Plant treatment. In the (-)PIant treatment, no ^<15>N absorbed by the plants after plant cutting. The amount of exchangeable NH_4^+-^<15>N in the 1st soil layer (0-20mm) was negligible throughout the experimental period in both treatments. The amount of immobilized ^<15>N in the (+)Plant treatment was larger than that in the (-)Plant treatment until 4 DAF. These results indicated that plant growth enhanced biological N fixation in soil during the first 4 DAF. The amount of denitrified ^<15>N estimated in the (-)Plant treatment (62% of applied N at 2 DAF and 21% at 4 DAF) was larger than that in the (+)Plant treatment (2.1% at 2 DAF and 3.5% at 4 DAF). The rate of suppression of the denitrification N loss (RSDN) by plants was 57% at 2 DAF and 17% at 4 DAF. The higher RSDN at 2 DAF in this experiment was mainly due to differences between the two treatments in the amounts of ^<15>N recovered by the plants and immobilized in soil. These results suggest that N absorption by the plants and N immobilization in soil reduced the denitrification N loss in the rhizosphere soil.
- 社団法人日本土壌肥料学会の論文
著者
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Kakuda Ken-ichi
Faculty of Agriculture, Yamagata University
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Ando Ho
Faculty of Agriculture, Yamagata University
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Ando Ho
Faculty Of Agriculture Kagawa University
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Konno T
Faculty Of Agriculture Yamagata University:(present Address)sanwa Canning Co. Ltd.
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Konno Tetsuya
Faculty of Agriculture, Yamagata University
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Kakuda Ken-ichi
Faculty Of Agriculture Yamagata University
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Konno Tetsuya
Faculty Of Agriculture Yamagata University:(present Address)sanwa Canning Co. Ltd.
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