Phosphorus availability in soils amended with different phosphate fertilizers

Accurate measurement and characterization of phosphate rock dissolution are important for a better understanding of phosphorus (P) availability in soils. An incubation study was carried out on two New Zealand topsoils (0-15 cm; high P buffering capacity Craigieburn and low P buffering capacity Templ...

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Bibliographic Details
Published in:Communications in soil science and plant analysis 2006-02, Vol.37 (1-2), p.25-39
Main Authors: Randhawa, P.S, Condron, L.M, Di, H.J, Sinaj, S, McLenaghen, R.D
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
buffering capacity
fertilizer application
fertilizer requirements
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
isotopic exchange kinetics
kinetics
Nitrogen, phosphorus, potassium fertilizations
nutrient availability
phosphates
phosphorus
reactive phosphate rock
rock phosphate
soil fertility
Soil science
soil treatment
Soil-plant relationships. Soil fertility. Fertilization. Amendments
topsoil
water solubility
water-soluble phosphorus
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Summary:Accurate measurement and characterization of phosphate rock dissolution are important for a better understanding of phosphorus (P) availability in soils. An incubation study was carried out on two New Zealand topsoils (0-15 cm; high P buffering capacity Craigieburn and low P buffering capacity Templeton) amended with North Carolina phosphate rock (NCPR) and water-soluble phosphate (WSP) at 218 mg P kg(-1) (equivalent to 60 kg P ha(-1)). Isotopic exchange kinetics was carried out after 12 h and 28 days of incubation to characterize P availability. This study showed that sensitivity of capacity factors (r1/R, n) to explain changes in E1min values was affected by the P buffering capacity of the soils. The recovery of applied P in the E pool (Rec(inE)%) with extended incubation time was similar from the NCPR and WSP treatments (3.1-3.3%) in the Craigieburn soil compared with the Templeton soil in which Rec(inE)% values were greater in WSP (9%) than NCPR (1.3%) treatment. The higher values of P derived from the applied P fertilizers in the E pool (Pdff(inE)%>80%) suggested that the NCPR application in both soils would be efficient for increasing P availability to plants.
ISSN:0010-3624
1532-2416
DOI:10.1080/00103620500403572