Effect of organic carbon on the denitrification capacity of yellow podzolic soils in Mt. Cotton, Southeast Queensland

Alagano, Artemio C. (1983). Effect of organic carbon on the denitrification capacity of yellow podzolic soils in Mt. Cotton, Southeast Queensland Master's Thesis, School of Land, Crop and Food Sciences, The University of Queensland.

       
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Author Alagano, Artemio C.
Thesis Title Effect of organic carbon on the denitrification capacity of yellow podzolic soils in Mt. Cotton, Southeast Queensland
School, Centre or Institute School of Land, Crop and Food Sciences
Institution The University of Queensland
Publication date 1983
Thesis type Master's Thesis
Supervisor Dr. S. A. Waring
Total pages 90
Language eng
Subjects 0701 Agriculture, Land and Farm Management
Formatted abstract Eighteen surface soil samples (0-20 cm) of two sizes and moisture contents [< 1 cm field moist (FM) and < 2 mm air-dried (AD)] were used to evaluate the denitrification capacity and its relation to soil carbon in a yellow podzolic soil from Mt. Cotton, southeast Queensland.

Loss through denitrification was based on the disappearance of nitrate nitrogen (NO3-N). Excess NO3-Nwas provided by adding 271 ug NO3-N /g as KN03 and then incubating at 30⁰C for periods of 1 to 4 days. Walkley-Black organic carbon (WBOC) ranged from 0.88 to 1.84% while water soluble organic carbon (WSOC) ranged from 7.6 to 25.7 and 27.8 to 93.6 ug/g of soil for the < 1 cm FM and < 2 mm AD samples, respectively.

In both samples, the total NO3-N loss and rates were higher in the < 2 mm AD soil. At the end of 4 days incubation, 92.2 ug NO3-N/g of soil was lost from 2 mm AD samples while 28.7 ug NO3-N/g was lost from < 1cm FM samples. The rate of loss in the < 2 mm AD samples was rapid during the first 24 hours and declined with time of incubation. On the other hand, a more or less uniform rate was observed in the < 1 cm FM samples.

Denitrification was highly correlated with WBOC for the < 1 cm FM samples and less correlated with the < 2 mm AD samples. WSOC on the other hand was highly correlated with the < 2 mm AD soils and not at all with the < 1 cm FM soils. Similar correlations were obtained with denitrification rates. The reasons for the differences in the correlations for the different soil samples used are discussed.

Keyword Podzol -- Queensland -- Mount Cotton
Nitrification
Soils -- Carbon content
Additional Notes

Spine title: Denitrification capacity of yellow podzolic soils in Mt. Cotton, Southeast Queensland.

 
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