Estimation of phosphorus availability in composts and compost/peat mixtures by different extraction methods

Autor:	Hilke Fokken, Ingrid Peters, D. Alt
Rok vydání:	1994
Předmět:	Peat Compost Phosphorus Extraction (chemistry) Soil Science chemistry.chemical_element engineering.material Dilution chemistry.chemical_compound chemistry Botany engineering Formate Extraction methods Food science Decreased ph Agronomy and Crop Science
Zdroj:	Communications in Soil Science and Plant Analysis. 25:2063-2080
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103629409369172
Popis:	A trial was carried out with compost and compost/peat mixtures to test several extraction methods for the estimation of availability of phosphorus (P). The test plant was Dendranthema grandiflorum All composts had a high pH and salt content. Amounts of P extracted by different extraction methods decreased in the order: Formate < CAL < NH4‐acetate < CaCl2/DTPA < CaCl2. Dilution of compost with peat decreased pH and increased availability of P. The better availability of P caused by dilution with peat was not reflected by the Formate‐, CAL‐, and NH4‐acetate method. These acid and well‐buffered extraction solutions overestimate P, and are therefore not suited to estimate availability of P in composts and compost/peat mixtures. Weak extraction solutions, like CaCl2 and CaCl2/DTPA, gave results which showed a good correlation with P content of plants and P uptake. The advantage of the latter method compared with CaCl2 is the extraction of amounts of P comparable to amounts taken up by the plants. Ther...
Databáze:	OpenAIRE
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