A Simplified CaCl2–Ca(OH)2 Equilibration Method to Determine the Lime Requirement of Acid Soils of Odisha
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Authors
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P.K. DAS
Department of Soil Science and Agricultural Chemistry Orissa University of Agriculture & Technology, Bhubaneswar - 751 003, Odisha
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SAMANTA
Department of Soil Science and Agricultural Chemistry Orissa University of Agriculture & Technology, Bhubaneswar - 751 003, Odisha
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G.H. SANTRA
Department of Soil Science and Agricultural Chemistry Orissa University of Agriculture & Technology, Bhubaneswar - 751 003, Odish
Keywords:
Acid soils, Lime requirement, Modified Woodruff Buffer method, Simplified Ca(OH)2, CaCl2–Ca(OH)2 Equilibration methods)Abstract
Lime requirements (LR) of some acid soils of Odisha belonging to Alfisols, Inceptisols and Entisols were evaluated by Ca(OH)2equilibration, CaCl2–Ca(OH)2 equilibration and modified Woodruff buffer (mod. WB) methods. Lime requirement of the soils increased in the order of LR determined by Ca(OH)2 equilibration method< LR determined by CaCl2–Ca(OH)2 equilibration method< LR determined by mod. WB method. A linear relationship existed between the OHadded and increase in pH in Ca(OH)2 and CaCl2–Ca(OH)2 equilibrations. On the basis of this linearity a simple and rapid method was tried to develop to determine LR of the soils by adding Ca(OH)2 solutions of selected concentrations instead of adding Ca(OH)2 solutions of several concentrations. It was observed that LR determined by adding saturated Ca(OH)2 solutions of 0
& 4 mL in Ca(OH)2 equilibration method and 0 & 8 mL in CaCl2–Ca(OH)2 equilibration method were close to the LR determined from the full equilibration study i.e. after adding Ca(OH)2 solutions of several concentrations. These two methods were referred to as simplified Ca(OH)2 equilibration and simplified CaCl2–Ca(OH)2 equilibration methods, respectively. Laboratory incubation and pot culture experiment showed that the simplified Ca(OH)2 equilibration method underestimated, whereas simplified CaCl2–Ca(OH)2 equilibration and mod. WB methods over estimated LR of the soils to the desired pH 6.5 measured after 15 days of liming. Soil pH in the laboratory incubation study increased between 6.0 and 6.5 in different soils when lime was applied @ 0.5 LR as per simplified CaCl2–Ca(OH)2 equilibration method. It increased between 6.3 and 6.8 when lime was applied at the same rate as per mod. WB method. In the pot culture experiment, the change in soil pH at 15 days of liming showed that application of lime @ 0.5 LR by simplified. CaCl2–Ca(OH)2 equilibration and mod. WB methods slightly overestimated the LR to the desired pH 6.5. Liming the soil at 0.3 LR as per the simplified CaCl2–Ca(OH)2 equilibration method slightly underestimated the desired pH 6.5. Liming the soil as per the simplified CaCl2–Ca(OH)2 equilibration method was significantly superior to liming as per simplified Ca(OH)2 equilibration method but equivalent to liming as per mod. WB method in producing the dry matter yield of maize. Increasing the lime level from 0.3 to 1.0 LR had no significant effect in increasing the dry matter yield of maize.
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