Phosphorus losses through transfer, soil erosion and runoff : processes and implications
Phosphorus losses through transfer, soil erosion and runoff : processes and implications
Ward, Jonet C. ; Talbot, J. M. ; Denne, T. ; Abrahamson, Michael
Ward, Jonet C.
Talbot, J. M.
Denne, T.
Abrahamson, Michael
Date
1985-12
Type
Monograph
Fields of Research
Abstract
Phosphate rock is a strategic material upon which pastoral agriculture
and all New Zealanders depend. Phosphate fertilizer has no close
substitute, and is, therefore an important limiting factor to agricultural
productivity. The future wellbeing of the country depends on its
efficient acquisition, manufacture, distribution and use.
This report is part of a larger cross-disciplinary study carried out
by Centre staff on the multiple dimensions of phosphate management in
New Zealand. The report presents an examination of phosphorus losses
from the production system and the attendant consequences on environmental
quality. Special emphasis is given to hill country loss
mechanism, where it is known that significant amounts of phosphate
fertilizer are picked up in surface runoff and/or are displaced by
grazing animals. The longer term consequences of nutrient loading
on downstream water bodies are discussed, and the policy and management
implications for maintaining current water quality levels are highlighted.
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