Phosphorus loading and environmental analysis in manured Saskatchewan soils
Date
2005-02-17
Authors
Stumborg, C.M.
Schoenau, J.J.
Qian, P.
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Presentation
Degree Level
Abstract
Phosphorus (P) is a key element in plant nutrition, but excessive amounts can accumulate in the soil if manure P application rates exceed crop uptake over time. Risk of potential P movement and contamination of surface waters is directly related to the soluble P content of the surface soil. Thus it is important to have an accurate and efficient method of analysis that can be utilized for both agronomic and environmental purposes. On four long-term (five to eight years of annual application) manure research sites in Saskatchewan, four assessments of labile P in soils were compared: sodium bicarbonate extractable, water extractable, anion exchange membrane (PRS™-probes) supply rate, and Modified Kelowna (MK) extractable on soils that received annual manure application rates in excess of recommended levels. All methods were highly correlated with one another, with the exception of MK. The soil P indices increased with manure
P application rate and were correlated with plant P concentration and uptake.
Description
Keywords
PRS™-probes, phosphate, kelowna, sodium bicarbonate, water soluble, swine manure, cattle manure, effluent
Citation
Degree
Department
Program
Advisor
Committee
Citation
Part Of
Soils and Crops Workshop