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UBC Theses and Dissertations
Phosphorus release from a slow-release fertilizer under simulated stream conditions Sterling, Megan Sheryl
Abstract
A new slow-release fertilizer has been developed to restore productivity in nutrient deficient streams. The product (7-40-0; N-P₂O₅-K₂O) was studied to determine physical and chemical conditions which might inhibit phosphate release. In laboratory analyses, hardness (> 40 mg Ca²⁻-L⁻¹) and humic material (> 100 colour units) complexed phosphate and inhibited its dissolution from the pellets; pH, alkalinity and iron had less effects on phosphate solubility. A series of indoor trough experiments indicated fertilizer dissolution was independent of velocity (0.15-0.30 m/s), pellet size (2-9 g) and water temperature (8-14.5 °C). Fertilizer treatments (0.5-5 μg P L⁻¹) in outdoor trough experiments increased periphyton abundance and altered the dominant diatom species. A saturation level for periphyton growth and biomass was achieved at ~ 1.0 μg L⁻¹ orthophosphate from May- June; in June-July growth and biomass increased proportionally to fertilizer additions. Relationships developed during these controlled experiments demonstrate streams having < 40 mg L⁻¹ calcium, < 100 colour units and ranges within other variables tested are optimal for slow-release fertilizer additions.
Item Metadata
Title |
Phosphorus release from a slow-release fertilizer under simulated stream conditions
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
A new slow-release fertilizer has been developed to restore productivity in nutrient
deficient streams. The product (7-40-0; N-P₂O₅-K₂O) was studied to determine physical and
chemical conditions which might inhibit phosphate release. In laboratory analyses, hardness
(> 40 mg Ca²⁻-L⁻¹) and humic material (> 100 colour units) complexed phosphate and
inhibited its dissolution from the pellets; pH, alkalinity and iron had less effects on
phosphate solubility. A series of indoor trough experiments indicated fertilizer dissolution
was independent of velocity (0.15-0.30 m/s), pellet size (2-9 g) and water temperature (8-14.5 °C). Fertilizer treatments (0.5-5 μg P L⁻¹) in outdoor trough experiments increased
periphyton abundance and altered the dominant diatom species. A saturation level for
periphyton growth and biomass was achieved at ~ 1.0 μg L⁻¹ orthophosphate from May-
June; in June-July growth and biomass increased proportionally to fertilizer additions.
Relationships developed during these controlled experiments demonstrate streams having
< 40 mg L⁻¹ calcium, < 100 colour units and ranges within other variables tested are optimal
for slow-release fertilizer additions.
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Extent |
7641152 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-12
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0050297
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.