Effects of peat moss and sawdust compost applications on N_2O emission and N leaching in blueberry cultivating soils(Environment)
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概要
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Upland blueberry (Vaccinium ashei Read.) requires acidic and organic matter rich soils for its cultivation. Recently, the raised bed cultivation system has widely been used for blueberry cultivation, but it has a potential to cause nitrogen (N) losses via leaching and nitrous oxide (N_2O) emission especially with high rate of N application. We investigated the effects of organic amendments on N losses; via leaching ammonium (NH_4^+) and nitrate (NO_3^-) and N_2O emission under acid soil conditions. The treatments were (i) ammonium sulfate application (AS), (ii) AS with peat moss (AS+PM), and (iii) AS with sawdust compost (AS+SD). A container (surface area: 47cm×40cm=0.188m^2) experiment to simulate raised bed cultivation system using an ochric Cambisol was conducted at Chiba University, Japan, during 2008 and 2009. A blueberry plant in each container received N fertilizer three times: 14.8, 23.8, and 14.8gNm^<-2> in July 2008, March, and July 2009, respectively. Incorporation of peat moss and sawdust compost with ferrous sulfate effectively decreased soil pH to its optimal ranges (4.0-5.2) and resulted in increased growth and yield of blueberry (berry yield of 2009: 93, 285, and 348g plant^<-1> in AS, AS+PM, and AS+SD treatment, respectively) due to increased soil porosity and consequently enhanced plant root biomass. Concurrently, the AS+SD treatment resulted in the least N losses, followed by AS+PM and AS treatment both through leaching and N_2O emission. The emitted N_2O amount over about two-year blueberry cultivation were 1.28, 0.80, and 0.58gNm^<-2> for AS, AS+PM, and AS+SD treatments, respectively. These results indicated that application of organic amendments decreased N losses to the environment most likely due to increased plant N uptake, microbial N immobilization, and consequent reduction in nitrification, denitrification, and leaching.
- 一般社団法人日本土壌肥料学会の論文
著者
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Inubushi Kazuyuki
Graduate School Of Horticulture Chiba University
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Vano Imre
Graduate School of Horticulture, Chiba University
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Vano Imre
Grad. Sch. Hort. Chiba Univ.
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Tang Changyuan
Graduate School Of Horticulture Chiba University
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MATSUSHIMA Miwa
Graduate School of Horticulture, Chiba University
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Matsushima Miwa
Graduate School Of Horticulture Chiba University
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Vano Imre
Graduate School Of Horticulture Chiba University:(present Office)szent Istvan University Faculty Of
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