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Manganes-Phosphorus Interactions in Soils and in Soybean (Glycine max Merrill)
Dissertation Abstract:
Laboratory and pot experiments were conducted to study the relationship between manganese (Mn) and phosphorus (P) in aqueous, soil and soil-plant (soybean) systems.
Results showed that aqueous system, Mn and P decreased simultaneously and rapidly in the solution at pH 5 in 1:1 molar ratio, indicating the formation of a common compound which settled as a precipitate. Mn rapidly decreased in the solution at pH 4 when the Mn:P ratio was 1:10, and P exhibited the same phenomenon when the ratio was 10:1. Both Mn and P decreased slightly in the solution at pH 7 to 8.
The addition of Mn in the soil solutions decreased the amount of P and vice versa, thus confirming the previous observation that the two elements tend to form a common precipitate. P alone added to soils decreased in amount with time, but less than when Mn was added, implying the tying up of P with other elements in the soil.
Available P added to soil nodules with 13.02 and 5.02% Mn decreased in the solution, the reduction being higher in the nodules with higher Mn. This is another proof that available P in the soil system can be reduced by the presence of Mn compounds.
Mn application to the soil decreased the amount of P in the plant tissues of soybean grown in pots, whereas the application of P increased Mn in the tissues. The application of one of the two elements in the soil planted to soybean reduced the residual concentration of the other.