Abstract:A substantial amount of effort has been put into understanding soil P availability for soils under long-term organic farming. Soils of two organic farms were collected to evaluate phosphorus (P) adsorption isotherm. S1 and S2 were Sicum farm soils (loamy sand soils) with 23 years and 12 years organic farming, respectively. F1 and F2 were Faium farm soils (sandy clay loam soils) with 10 years and 2 years organic farming, respectively. Organic matter percentage for S1, S2, F1, and F2 were 10.4, 6.1, 22.9, and 16… Show more
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