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Mineralization of soil organic nitrogen and nitrogen absorption by rice plant as affected by drying duration

Journal of the science of soil and manure, Japan Volume 66 Issue 5 Page 499-505
published_at 1995-10-05
2007020014.pdf
[fulltext] 2.57 MB
Title
乾燥期間が土壌有機態窒素の無機化, 水稲の窒素吸収に及ぼす影響について
Mineralization of soil organic nitrogen and nitrogen absorption by rice plant as affected by drying duration
Creators Ando Ho
Creators Marumoto Takuya
Creators Wada Gensichi
Creators Nakamura Tutomu
Creator Keywords
乾燥期間 水稲 窒素吸収 有機態窒素の無機化 drying duration mineralization of soil organic nitrogen nitrogen absorption paddy rice
The effects of moisture content of soil and drying duration on the mineralization of soil organic N and N absorption by rice plants were evaluated using paddy soils derived from alluvial sediment and volcanic soils in tropical and temperate areas. The results obtained are as follows : 1) The amount of N mineralized for 4 weeks incubation increased with the decreasing soil-to-water ratio. No significant difference was observed in the water content of soil when the drying duration was more than 4d. However, the longer the duration of drying, the greater the amount of N was mineralized irrespective of the soils' parent materials and the areas where it was obtained. 2) There were significant differences in the dry weight and amount of N in rice plants among treatments. The amount of N in rice plants increased with the increasing duration of drying up to 6 weeks. However, the dry matter increase of the rice plant grown in soil dried for 8 weeks was smaller than the other treatments despite the highest N mineralization observed in this soil. 3) The mineralization rate of soil organic N was higher at 1 or 2 weeks after incubation than at 3 or 4 weeks.
Subjects
農学 ( Other)
Languages jpn
Resource Type journal article
Publishers 日本土壌肥料学会
Date Issued 1995-10-05
File Version Version of Record
Access Rights open access
Relations
[ISSN]0029-0610
[NCID]AN00195767
[isVersionOf] [NAID]http://ci.nii.ac.jp/naid/110001748141/
Schools 農学部