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Contribution of Reg...
Contribution of Regis R. Simard to phosphorus research in agroecosystems and future prospects
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- Bolinder, Martin (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för markvetenskap,Department of Soil Sciences
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(creator_code:org_t)
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- 2009
- 2009
- English.
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In: Canadian Journal of Soil Science. - 0008-4271. ; 89, s. 145-155
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https://res.slu.se/i...
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https://doi.org/10.4...
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Abstract
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- Can. J. Soil Sci. 89: 145-155. In this paper we present the soil test P saturation, budget, and fractionation procedures used in R. R. Simard's laboratory. We expand that work to: (1) Mehlich-III P saturation index using a weighting factor for Fe accumulation in soils; (2) P budget including below-ground biomass; and (3) compositional data analysis of P fractions to describe changing patterns of soil P fractions that differ in their availability to plants and risk to the environment. The Mehlich III P and Al two-way classification applied to forage crops by Simard and co-workers was replaced by the P/Al ratio test for P fertilizer recommendation in Quebec. The concept was further expanded to (P/[Al+gamma Fe), where gamma is 0 or 1 in mineral soils and 5 in organic soils. To provide a more complete picture of the P budget and risk index in agroecosystems, it Would be advantageous to consider root P, despite limited data. Using compositional analysis for a closed information space or simplex, a perturbation vector describing relative increase or decrease in P pools in response to a driving variable as well as the simplicial distance between control and modified soil P simplexes showed that added P primarily influenced the most labile inorganic P fractions (resin-P(i) and NaHCO(3)-P(i)) in five Quebec gleysolic soils. Changes in P patterns were more prominent in coarse- than in fine-textured soils. Soil P saturation, the P budget and proximate P analysis used by R.R. Simard support current progress on P issues. Future research should address gamma as a function of soil Fe forms (hydroxide or bound to organic matter), below-ground P in the P budget, and soil P compositional patterns in response to driving variables.
Subject headings
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Jordbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Agricultural Science (hsv//eng)
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- ref (subject category)
- art (subject category)
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