Jurnal TANAH TROPIKA (Journal of Tropical Soils), Vol 22, No 2

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Phosphorus Extraction from Soil Constituents in Equilibrium and Kinetics Applying Bray P-1, Mehlich-1, and Olsen Solutions

Jamalam Lumbanraja, sri mulyani, Muhajir Utomo, . Sarno


Phosphorus (P) which is an essential macro nutrient is one of the most limiting factors for plant growth in humid tropical soils. There are several methods have been applied to estimate the quantity of available  P  in soil constituents in relation to the plant production.   The method solutions of Bray P-1, Mehlich-1, and Olsen are the most frequently used in equilibrium condition  to estimate the  available P in the soil constituents.  But each of  the methods can give some different values that may not describe the availability of P. Therefore, it is necessary to conduct a laboratory experiments to compare the three solutions in equilibrium and kinetics for  P release from soil colloids as a basic data for the future relating to plant productions. The objectives of this study is to compare the quantity of P release in equilibrium and kinetics using P Bray P-1, Mehlich-1, and Olsen solutions and  rate constant (k) of P release from soil colloids using the three solutions of five soil constituents or treatments: (1) Soil (100% soil), (2) P-rock (100% of  phosphate rock), (3) compost (100% of chicken manure compost), (4) soil+P-rock (75% of soil + 25% of  phosphate rock), and (5) soil+P-rock+compost (50% of soil + 25% of phosphate rock + 25% of chicken manure compost) which  were extracted in triplicate. The results indicated that the quantities of   extracted  P employing equilibrium conditions in all treatments are significantly lower compare to that of kinetics . The results also showed that Mehlich-1 solution was the most power full to extract P from soil constituents  following Bray P-1 solution and the least was Olsen solution, except in the soil+P-rock+compost treatment where the quantity of extracted P using Mehlich-1 solution was still the highest  then following that of P extracted by Olsen solution and the lowest was Bray P-1 solution both in equilibrium and kinetics conditions. The highest rate constants (k) of the reaction in all treatments were found  in  using Melich-1 solution for desorbed P following that of using Bray P-1 solution and the least was that of  using Olsen solution. 

Keywords: Available phosphorus, compost, equilibrium, kinetic, phosphate rock, P extraction solutions, rate constant, soil


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