The Effect of Time on Phosphorus Availability on Two Soils as Determined by Soil Analysis and Plant Uptake

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Date
1986
Authors
Anthony O E
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Anthony O E
Abstract
Laboratory analysis and greenhouse experiments were conducted to investigate if standard soil tests for P adequately evaluate the availability of applied fertilizer, the nature and availability of residual P, and evaluation of the applicability of Langmuir and Freundlich adsorption equations in describing P sorption by a ca lcareousUly silt loam subsoil and an acidic Thurman loamy fine sand topsoil. Monopotassium phosphate (KH2P04) at 0, 10, 20, 40, and 80 mg P kg-l . was mixed with soils and incubated at field capacity for 20 months. Phosphorus was extracted with Bray P-l, NaHC03, Mehlich No.2, North Carolina, and Truog's extractants. Oats (Avena sativa) were grown on the soil s after 4, 8, and 20 months. The A and L ,values were al so determined using
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