Phosphorus loading and environmental analysis in manured Saskatchewan soils
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.
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