Αποτελέσματα Αναζήτησης
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).
Calcium chloride has a very high enthalpy change of solution, indicated by considerable temperature rise accompanying dissolution of the anhydrous salt in water. This property is the basis for its largest-scale application.
Results, in this case, are reported as pH (CaCl2). Soil tested in CaCl2 solution gives pH values about 0.5–0.8 lower than the same soil tested in water.
1 Οκτ 2011 · Soil pH is commonly measured in water or 0.01 m CaCl (2). Soil pH in CaCl (2) is usually preferred as it is less affected by soil electrolyte concentration and provides a more consistent...
1 Απρ 2012 · Soil pH measured in 0.01 M CaCl2 was found to increase by up to 0.23 of a unit due to long term (7 years) storage of dried surface soil.
Regression equations were derived for converting pH values of organic soils determined by five procedures. Data were obtained by measuring the pH of 30 soils using the following volumetric ratios and solutions: 1:1, soil to water; 1:2 and 1:4, soil to 0.01M CaCl 2; and 1:2 and 1:4 soil to 1N KCl.
