NDLI: Nitrate Dynamics in Shallow Groundwater and the Potential for Transport to Off-Site Water Bodies

Content Provider	Springer Nature Link
Author	Rasiah, V. Armour, J. D. Yamamoto, T. Mahendrarajah, S. Heiner, D. H.
Copyright Year	2003
Abstract	Large quantities of the nitrate leaching below the crop root-zone, particularly during the wet season, in the tropical Far North Queensland (FNQ) of Australia, may be entering off and on-site the water bodies. The objectives of this study were to (i) provide quantitative information on NO$_{3}$-N in the shallow fluctuating groundwater (GW) that develops during the rainy season (January through May) in the Johnstone River Catchment (JRC) of FNQ and (ii) determine whether this NO$_{3}$-N is potentially transportable to creeks/streams. The NO$_{3}$-N concentration and GW table heights were monitored, at least at weekly intervals, in 6 piezometers, installed to 8.5–12.0 m depth in 6 different soil types under fertilized sugarcane (Saccharum Officinarum-S) in the JRC during the 1999 rainy season.Depending on the location of piezometers on the landscape and time of water sampling, the GW table fluctuated between from 1.5 to 11.5 m abovethe piezometer bottom. The NO$_{3}$-N concentration in the fluctuating GW also showed spatio-temporal dynamics and it ranged from 0.60 to 3.70 mg L$^{-1}$. The NO$_{3}$-N adsorbed at anion exchanges sites, up to 10 m depth, ranged from 154 to 3956 kg ha$^{-1}$, compared with 21 kgha$^{-1}$ under rainforest. In the fluctuating GW, the NO$_{3}$-N concentration increased with increasing GW table height and the NO$_{3}$-N adsorbed at anion exchange sites (R$^{2}$ = 0.96). The NO$_{3}$-N load in the GW ranged from 40 to 110 kg ha$^{-1}$ and it increased with increasing GW table and GW NO$_{3}$-N concentration. The estimated N-load in the GW that was discharged into creeks/streams when the GW receded ranged from 21 to 81 kg ha$^{-1}$. The results provide evidence that a(i) a major proportion of the NO$_{3}$-N that was leaching below the sugarcane root-zone entered the shallow GW that developed during the rainy season, and (ii) a significant proportion of the NO$_{3}$-N inthe GW was transported to creeks/streams when the GW table receded.
Starting Page	183
Ending Page	202
Page Count	20
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	147
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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