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language
eng
Author
MORITSUKA, Naoki
MATSUOKA, Kaori
MATSUI, Kensuke
WAKATSUKI, Toshiyuki
Description
We previously reported that heating sewage sludge significantly changes the rate of N mineralization. The present study was undertaken to examine the extent to which these changes affect plant growth and nutrient supply after application to different soils. A pot experiment in which komatsuna plants (Brassica campestris L. var. rapa) were grown in a Fluvisol or an Arenosol indicated that the amount of N taken up by the plants increased significantly by heating air-dried sludge at 120°C and decreased significantly by heating at 180°C. Heat-drying of the sludge at 120°C or 180°C also increased the N uptake significantly. These plant responses could be explained by the heat-induced changes in the release of inorganic N from the sludge. In contrast to N, the sludge materials containing Fe as a coagulant immobilized soil soluble P. When the sludge was applied to an Andosol, the N-supplying effects on plant growth were offset by P adsorption onto the sludge and soil. In a successive pot experiment conducted without additional sludge application, it was further suggested that frequent sludge application is required to maintain plant growth. However, it will also lead to the accumulation of sludge components in the soil because less than 40% and 15% of the sludge N and P, respectively, were apparently recovered in two harvests of the plants. In conclusion, heated sludge materials can act as an effective organic N fertilizer provided that they are applied to a suitable soil and that the short-term effects on soil productivity are balanced with the long-term effects on environmental quality.
Subject
heating treatment
mass flow
nitrogen
pot experiment
sewage sludge
Journal Title
Soil science and plant nutrition
Volume
52
Issue
4
Start Page
528
End Page
539
sort
528
ISSN
0038-0768
Published Date
2006-08
DOI
NII Type
Journal Article
Content Type
9001
Format
PDF
Text Version
出版社版
Gyoseki ID
e744
OAI-PMH Set
Faculty of Life and Environmental Science
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