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## SS1: AGRICULTURAL SCIENCE - 2ND TERM

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Lesson 5, Topic 3
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# Laboratory Experiment on Soil

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#### Topic Content:

• Experiment 1 – To determine the Moisture
• Experiment 2 – To Determine the Presence of Living Organisms in the Soil
• Experiment 3 – Confirmation that Soil Sample Contains Air
• Experiment 4 – Determine the Porosity and the Water-Retaining Capacity of Different Soil Types
• Experiment 5 – Determine Percentage of Organic Matter

### Experiment 1 – To Determine the Moisture:

Title of Experiment: To determine the moisture content of a sample of soil that is moist.

Materials required: Soil sample, weighing balance, evaporating dish, stirring rod, wire gauze, bunsen burner, tripod stand.

Method:

• Weigh the mass of the empty evaporating dish.
• Place a sample of soil into the dish and re-weigh.
• Heat the dish with the soil with a Bunsen burner for two to three hours.
• Stir the soil constantly with the glass rod to aid evaporation.
• At the end of the period, the dish with the soil is cooled in a desiccator and reweighed.

Results and Calculation:

Mass of empty evaporating dish = 30 g
Mass of dish + fresh soil = 45 g
Mass of fresh soil only [45 – 30] g = 15 g
Mass of dish + dried soil = 40 g
Mass of dried soil only = [40-30] g = 10 g
Mass of water driven off [15-10] g  = 5 g

Percentage of water by mass

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