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| Titel: |
Comparison of phosphate-phosphorus and total phosphorus in DTPA extracts for assessing plant-available phosphorus in soilless potting media |
| Auteur: |
Handreck, Kevin A. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 27 (1996) nr. 9-10 pagina's 2125-2135 |
| Jaar: |
1996-05 |
| Inhoud: |
Hakea francisiana and H. laurina were grown in soilless media based on pine bark, to which had been added one of the following phosphorus (P) sources: crushed bone, rock phosphate, calcined rock phosphate, sewage sludge, or sludge compost. Available P was assessed through extraction with unbuffered 2 mM DTPA. Similar regression equations between shoot P content and P in 2 mM DTPA extracts of the media at potting were obtained for both total P in the extract (determined by inductively coupled plasma emission spectrometry) and PO4-P. The difference between them was small compared with the variation caused by different rates of dissolution of P the various sources during the growing period. Extractants give only an approximate guide to plant P uptake when the medium contains sources that slowly dissolve during the growing period. Nevertheless, the data indicate that, irrespective of P source, the maximum P concentration in a 2 mM DTPA extract (1:1.5 v/v) of the medium that is tolerated by P-sensitive plants is 3-4 mg/L. This is similar to the concentration found previously for superphosphate as the source of P. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 35 gevonden artikelen
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