Evaluation Of Soil Test Methods For The Estimation Of Available Phosphorus In Some Tanzanian Soils-A Greenhouse Study

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Date
1974
Authors
Nandra S. S.
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Abstract
Since Dyer in 1890 estimated available phosphorus by treating the soils with 1 percent citric acid, various extractants have been recommended by various research workers e.g. Truog (1930), Baver and Bruner (1939),Bray and Kurtz (1945), Olsen (1954), Uhlen and Semb (1962) and Mehlich et al. (1962) etc. Bingham (1962) and Williams (1962) reviewed methods for the extraction of available phosphorus. No single method has proved successful in all soil types probably because phosphorus exists in different forms and at variable levels in different soil types. The phosphorus availability picture is further complicated by the fact that it is released from soil organic matter also and this release is dependent upon factors affecting microbiological activity (Fitts et al., 1956).
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East African Agricultural And Forestry Journal, 40 (NO1), p. 24-30