Changes in microbial biomass after continuous application of azolla and rice straw in soil

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概要

• 論文の詳細を見る

• A model experiment was conducted under tropical conditions with a view to evaluating the changes in microbial biomass and nutrient dynamics in upland soil through the continuous application of azolla and rice straw (2 g C kg^<-1> soil per each application). Flush decomposition of C was observed immediately after each application and the rate of mineralization did not change appreciably during this period. After flush decomposition, the rate of C mineralization from azolla was higher than that from rice straw until 9 to 13 weeks after each application and thereafter the mineralization rate was similar. The amount of inorganic N released from azolla increased following each application, whereas inorganic N in rice straw plot was immediately immobilized and the rate of immobilization increased until the 3rd application and did not increase further after the 4th application. The amounts of biomass C and N increased immediately after residue incorporation, reached the maximum level one week after each application and declined thereafter. Maximum biomass formation increased until the 2nd application and then the level remained constant. Maximum biomass N formation was higher in azolla than in rice straw after the 1st application, but after repeated applications, the difference became less pronounced. Continuous increase in biomass in a certain week after each application was observed, probably because of the cumulative effects of the previous applications. The increase suggests that continuous application of organic materials may enable to improve the amount of soil microbial biomass.

• 社団法人日本土壌肥料学会の論文

著者

• MARUMOTO Takuya

  Department of Biological Science, Faculty of Agriculture, Yamaguchi University

• Shindo H

  Yamaguchi Univ. Yamaguchi Jpn

• Shindo Haruo

  Faculty of Agriculture, Yamaguchi University

• Shindo H

  Department Of Electronics Faculty Of Engineering Hiroshima University

• NISHIYAMA MASAYA

  Faculty of Environmental Studies, Nagasaki University

• Nishiyama Masaya

  Department Of Applied Biological Chemistry Graduate School Of Agricultural And Life Sciences The Uni

• Nishiyama Masaya

  Faculty Of Agriculture Yamaguchi University

• Nishiyama Masaya

  Faculty Of Agriculture Yamaguchi University:(present Address)graduate School Of Agricultural And Lif

• MARUMOTO Takuya

  Faculty of Agriculture, Yamaguchi University

• Shindo Haruo

  Faculty Of Agriculture Nagoya University : (present Address) Faculty Of Agriculture Yamaguchi Univer

• Azmal Abul

  Faculty Of Agriculture Yamaguchi University:(present Address)bangladesh Rice Research Institute

• Marumoto T

  Department Of Biological Chemistry Faculty Of Agriculture Yamaguchi University

• Marumoto Takuya

  Department Of Biological Science Faculty Of Agriculture Yamaguchi University

• Marumoto Takuya

  Faculty Of Agriculture Kyusyu University

• Shindo Haruo

  Faculty Of Agriculture Nagoya University

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