Changes in natural ^<15>N abundance in paddy soils under different, long-term soil management regimes in the Tohoku region of Japan(Soil Fertility)

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概要

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• Long-term temporal changes in natural ^<15>N abundance (δ^<15>N value) in paddy soils from long-term field experiments with livestock manure and rice straw composts, and in the composts used for the experiments, were investigated. These field experiments using livestock manure and rice straw composts had been conducted since 1973 and 1968, respectively. In both experiments, control plots to which no compost had been applied were also maintained. The δ^<15>N values of livestock manure compost reflected the composting method. Composting period had no significant effect on the δ^<15>N value of rice straw compost. The δ^<15>N values increased in soils to which livestock manure compost was successively applied, and tended to decrease in soils without compost. In soils to which rice straw compost was successively applied, the δ^<15>N values of the soils remained constant. Conversely, δ^<15>N values in soils without rice straw compost decreased. The down-ward trend in δ^<15>N values observed in soils to which compost and chemical N fertilizer were not applied could be attributed to the natural input of N, which had a lower δ^<15>N value than the soils. Thus, the transition of the δ^<15>N values in soils observed in long-term paddy field experiments indicated that the δ^<15>N values of paddy soils could be affected by natural N input in addition to extraneous N that was applied in the form of chemical N fertilizers and organic materials.

• 社団法人日本土壌肥料学会の論文

著者

• Kato Naoto

  Tohoku Natl Agric Res Cent

• Kato Naoto

  National Agricultural Research Center For Tohoku Region:(present Office)national Agricultural Resear

• NISHIDA Mizuhiko

  National Agricultural Research Center for Tohoku Region

• SUMIDA Hirokazu

  National Agricultural Research Center for Tohoku Region

• IWAYA Kaori

  Aomori Prefectural Agriculture and Forestry Research

• Nishida Mizuhiko

  National Agricultural Research Center For Kyushu Okinawa Region:(present Address)national Agricultur

• Sumida Hirokazu

  National Agricultural Research Center For Tohoku Region:(present Office)national Agriculture And Foo

• Nishida Mizuhiko

  National Agricultural Research Center for Kyushu Okinawa Region:(Present address) National Agricultural Research Center for Tohoku Region

関連論文

• PA-22 Bacterial communities in paddy fields with long-term application of rice straw compost(Agricultural ecosystem,Poster presentation A)
• Uptake of Carbon and Nitrogen through Roots of Rice and Corn Plants, Grown in Soils Treated with ^13C and ^15N Dual-Labeled Cattle Manure Compost
• Fate of nitrogen derived from ^N-labeled cattle manure compost applied to a paddy field in the cool climate region of Japan(Fertilizers and Soil Amendments)
• Changes in natural ^N abundance in paddy soils under different, long-term soil management regimes in the Tohoku region of Japan(Soil Fertility)
• Fate of N and Relative Efficiency of ^N-Labeled Organic Materials Applied to Transplanted Rice in Northern Kyushu Region of Japan(Fertilizers and Soil Amendments)
• Changes in the N Recovery Process from ^N-Labeled Swine Manure Compost and Rice Bran in Direct-Seeded Rice by Simultaneous Application of Cattle Manure Compost (Fertilizers and Soil Amendments)
• Demonstration of Discrepancy in N Remaining Rate of Organic Matter Evaluated by N Content and ^N Content in the Glass Fiber-Filter Paper Bag Method (Fertilizers and Soil Amendments)
• Using different versions of the Rothamsted Carbon model to simulate soil carbon in long-term experimental plots subjected to paddy-upland rotation in Japan(Environment)

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