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Mineralizable N in some Malaysian rice soils


Citation

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. .

Abstract / Synopsis

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).


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Additional Metadata

Item Type: Conference or Workshop Item (Paper)
Divisions: Universiti Pertanian Malaysia
Keywords: Soils; Mineralizable soil; Rice soils
Depositing User: Erni Suraya Abdul Aziz
Date Deposited: 19 Dec 2013 12:55
Last Modified: 08 May 2017 18:07
URI: http://psasir.upm.edu.my/id/eprint/19831
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