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- W2299585969 abstract "SUMMARYIn order to develop a method for estimating labile, soil organic phosphorus (Po), macroporous anion-exchange and adsorbent (XAD) resins were tested for their ability to extract Po from a permanent pasture soil. Experimental variables included: ionic form, soil-water resin ratio, addition of cation-exchange resin, extraction time, extraction temperature, continuous and stepwise extraction and soil pretreatment (chloroform and microwaves).The amounts of extracted Po and Pi (inorganic phosphorus) showed little variation between the anion-exchange resins, when used in the bicarbonate form. In the chloride form, the amounts extracted were less and more variable. XAD resins extracted much less Po and very little Pi. The macroporous anion-exchange resin, Lewatit MP500A in the bicarbonate form, was chosen for further studies. It extracted 21 mg Po kg−1 from air-dried soil and 8 mg Po kg−1 from moist, incubated soil.The specific amounts of Po and Pi extracted were little affected by variations in the ratio between soil, water and resin, but increased with extraction time and temperature. Chloroform pretreatment of the soil mainly increased extracted Pi, whereas microwave pretreatment only increased extracted Po. The magnitude of these increases was approximately constant irrespective of extraction temperature, indicating that the increases came from killed micro organisms." @default.
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- W2299585969 date "1994-01-01" @default.
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- W2299585969 title "Resin extraction of labile, soil organic phosphorus" @default.
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