New Zealand Journal of Marine and Freshwater Research abstracts
NITRATE LEVELS IN SUBSURFACE WATERS OF THE WAIMEA PLAIN, NELSON
D. J. Stanton
Judy L. Martin
Cawthron Institute, P.O. Box 175, Nelson, New Zealand
Abstract
In 1969-72, nitrate determinations were made on waters from 122 wells on the Waimea Plain, Nelson, South Island, New Zealand. Four wells showed values above 30 mg NOa-N/litre with a maximum of 50 mg/litre in one well, fifteen were in the 30-20 mg/litre range, forty-six were between 20 mg and lOmg/litre; fifty-seven were below 10 mg/litre, and in only four wells was the nitrate concentration below 1.0 mg NOg-N/litre. Where it entered the plain, the Wairoa River usually contained about 0,07 mg NOs-N/litre, whereas the Waiiti River contained from 0.5 to 2.0 mg NO
3-N/litre.
Mapping of gradients of nitrate level indicated that these might contribute to aquifer definition and to sources of replenishing waters.
N.Z. Journal of Marine and Freshwater Research 9 (3): 305-9
Received 21 November 1974
PDF file of entire paper: medium quality (372K); (scanned from paper original: notes about this process)
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