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Equipment.
1.pH meter with appropriate
electrode (s)
2.Electronic weighing balance
3.5 cm3 stainless steel scoop
4.Pipettes or automatic dispensers
5.Paper cups or equivalent
Reagents.
1.Distilled or deionized water.
2.0.01M CaCl2: Completely dissolve 1.47g CaCl2.2H2O in 1 L of distilled or deionized
water.
3.1.0M CaCl2: Completely dissolve 14.7g CaCl2.2H2O in 100 mL of distilled or
deionized water.
4. Standard buffer solutions for calibrating pH meter, usually pH 4.0 and pH 7.0.
Procedure.
1.Calibrate the pH meter over the appropriate range using the standard buffers.
2.Weigh 5 g of sieved (2mm), air-dried soil into a paper cup in triplicate
3.Add 5 mL distilled or deionized water to the sample.
4.Stir vigorously for 15 seconds and let stand for 30 minutes.
5.Place electrodes in the slurry, swirl carefully, and read the pH immediately. Ensure that
the electrode tips are in the slurry and not in the overlying solution.
6.For the CaCl2 pH measurement, add 1 drop of 1.0M CaCl2 solution to the previous
sample. Alternatively, prepare a sample as was done in steps 2 and 3, using 0.01M
CaCl2 instead of water. Stir vigorously and let stand for 30 minutes, stirring
occasionally. Read the pH as in step 5.
7.Average the pH readings for your sample
8.Write a report on determination of soil pH, discuss the implications of the soil pH on
nutrient availability suggesting suitable management strategies
jim items answered the question on October 5, 2018 at 08:33
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