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Mineralizable N in some Malaysian rice soils

Mineralizable soil N is a very important N source in rice soils. In some cases more than 60% of the N requirement in an N fertilized rice crop is derived from soil N. A laboratory study was conducted to determine mineralizable (N) and mineralization constant (K) of 14 rice soils with varying soil pr...

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Main Authors: Yusop, Mohd Khanif, Rahimahbivi, O. H.
Format: Conference or Workshop Item
Language:English
Published: 1988
Online Access:http://psasir.upm.edu.my/id/eprint/19831/1/ID%2019831.pdf
http://psasir.upm.edu.my/id/eprint/19831/
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spelling my.upm.eprints.198312017-05-08T10:07:30Z http://psasir.upm.edu.my/id/eprint/19831/ Mineralizable N in some Malaysian rice soils Yusop, Mohd Khanif Rahimahbivi, O. H. Mineralizable soil N is a very important N source in rice soils. In some cases more than 60% of the N requirement in an N fertilized rice crop is derived from soil N. A laboratory study was conducted to determine mineralizable (N) and mineralization constant (K) of 14 rice soils with varying soil properties under submerged condition. Soils were collected at the depth of 0-15cm and incubated for eight weeks. Ammonium N was extracted at 0,2,4,6 and 8 weeks and determined by steam distillation. The ammonium-N mineralized was used to calculate No and K. The No ranged between 20.0 to 154.1mg/kg which represented between 1.0% and 7.3% of the total N. The K values ranged between 0.11 to 0.72Wk-1. The mineralized N at a specified time can be determined by using No and K values. The calculated and the observed mineralized N were compared: the results showed good agreement between the two values. The No and K values were not significantly affected by the total N,organic C and C/N ratio,however there is a significant correlation between No and K (r=0.76). 1988 Conference or Workshop Item NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/19831/1/ID%2019831.pdf Yusop, Mohd Khanif and Rahimahbivi, O. H. (1988) Mineralizable N in some Malaysian rice soils. In: 1st. International Symposium on Paddy Soil Fertility, 6-13 Dec. 1988, Chiangmai, Thailand. .
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Mineralizable soil N is a very important N source in rice soils. In some cases more than 60% of the N requirement in an N fertilized rice crop is derived from soil N. A laboratory study was conducted to determine mineralizable (N) and mineralization constant (K) of 14 rice soils with varying soil properties under submerged condition. Soils were collected at the depth of 0-15cm and incubated for eight weeks. Ammonium N was extracted at 0,2,4,6 and 8 weeks and determined by steam distillation. The ammonium-N mineralized was used to calculate No and K. The No ranged between 20.0 to 154.1mg/kg which represented between 1.0% and 7.3% of the total N. The K values ranged between 0.11 to 0.72Wk-1. The mineralized N at a specified time can be determined by using No and K values. The calculated and the observed mineralized N were compared: the results showed good agreement between the two values. The No and K values were not significantly affected by the total N,organic C and C/N ratio,however there is a significant correlation between No and K (r=0.76).
format Conference or Workshop Item
author Yusop, Mohd Khanif
Rahimahbivi, O. H.
spellingShingle Yusop, Mohd Khanif
Rahimahbivi, O. H.
Mineralizable N in some Malaysian rice soils
author_facet Yusop, Mohd Khanif
Rahimahbivi, O. H.
author_sort Yusop, Mohd Khanif
title Mineralizable N in some Malaysian rice soils
title_short Mineralizable N in some Malaysian rice soils
title_full Mineralizable N in some Malaysian rice soils
title_fullStr Mineralizable N in some Malaysian rice soils
title_full_unstemmed Mineralizable N in some Malaysian rice soils
title_sort mineralizable n in some malaysian rice soils
publishDate 1988
url http://psasir.upm.edu.my/id/eprint/19831/1/ID%2019831.pdf
http://psasir.upm.edu.my/id/eprint/19831/
_version_ 1643827152240508928
score 13.211869

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