Extraction of Soil Organic Nitrogen by Organic Acids and Role in Mineralization of Nitrogen in Soil (Soil Fertility)
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概要
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The solubilization of organic nitrogen (Norg) in soil was examined by using organic acids often present in root exudates. The organic acids tested were classified into two groups depending on their solubilizing ability for Norg in a soil sample. Oxalate, malonate, tartarate, citrate and malate could dissolve Norg by increasing their concentrations, while succinate and glutarate could not dissolve Norg even when their concentrations were increased. The amount of organic N extracted with oxalate, malonate, tartarate, citrate and malate showed a strong correlation with the sum of the amounts of Al and Fe in the extracts. Therefore, it was assumed that the solubilizing ability may be attributed to the structure of these organic acids that can form stable chelate compounds with Al and Fe (oxalate, malonate, tartarate, citrate and malate). Furthermore, the amount of 20mM citrate-extractable Norg (CEON), which was the highest among the organic acids tested, showed a strong correlation with both that of 67 mM phosphate buffer, which is now being widely used as an index for estimating soil N availability in Japan, and N mineralized using an incubation method in 46 soil samples belonging to different soil types. These results suggested that CEON might be an important constituent of mineralizable Norg in soil. Therefore, organic acids secreted by crops play a role in the solubilization of available Norg surrounding the crop rhizosphere.
- 社団法人日本土壌肥料学会の論文
著者
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Matsumoto Shingo
Shimane Univ. Shimane Jpn
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Matsumoto Shingo
Faculty Of Life And Environmental Science Shimane University
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Matsumoto Shingo
Education and Research Center for Biological Resources, Faculty of Life and Environmental Sciences,
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Ae Noriharu
Faculty of Agriculture, Kobe University
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Matsumoto Toshikazu
Shimane Agricultural Experimental Station
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Matsumoto Shingo
Education And Research Center For Biological Resources Faculty Of Life And Environmental Sciences Sh
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Ae Noriharu
Faculty Of Agriculture Kobe University
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Matsumoto Toshikazu
Shimane Agricultural Experiment Station
関連論文
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