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16 Αυγ 2011 · Soil pH in water and CaCl 2 and EC were measured with a 1:5 soil-to-solution ratio. The results show that incorporating EC in the prediction model improves the prediction of pH in CaCl 2 significantly.
Measuring soil pH requires preparation of a soil/liquid mixture and stirring it several times before leaving it to settle into a supernatant solution. The liquid is either deionized water or a prepared 0.01M CaCl2 solution that is added to soil in a 1:2 soil to liquid mixture (1:4 for organic soils).
Soil tested in CaCl2 solution gives pH values about 0.5–0.8 lower than the same soil tested in water. A desirable pH (CaCl2) range for plant production is 5.5 to 7.5.
Methods: pH (water) 4A1- 1:5 soil/water extract. pH (CaCl2) 4B1- 1:5 soil/0.01 M calcium chloride extract. pH is a measure of the soils acidity and alkalinity that gives an indication of the activity of the hydrogen ion (H+) and hydroxyl ion in (OH-) in a water solution.
Soil pH is determined by suspending the soil in a 0.01 M calcium chloride solution and then after a designated amount of time the solution is separated from the soil and the pH of the solution is measured.
1 Οκτ 2011 · Soil pH in water and CaCl(2) and EC were measured with a 1:5 soil-to-solution ratio. The results show that incorporating EC in the prediction model improves the prediction of pH in CaCl(2...
Soil pH is commonly measured in water (pHw) or 0.01 M CaCl2 (pHCa). The need to convert between these methods has led to the publication of linear, quadratic and cubic polynomial relationships for limited suites of soils.
