Class XII Practical: Biochemical & Physiological Experiments - Soil Analysis

Objective

To analyze soil samples from two different sites for texture, moisture content, humus content, water-holding capacity, and pH.

Sample Collection: Collect representative soil samples from two distinct sites (e.g., garden soil, roadside soil, forest soil).
Texture Analysis:
- Sedimentation Method: Mix soil with water in a jar, allow to settle, and observe layers of sand, silt, and clay.
- Feel Method: Rub moist soil between fingers to estimate texture.
Moisture Content: Weigh a fresh soil sample, dry it in an oven, and re-weigh to calculate percentage moisture loss.
Humus Content: Ignite a dried soil sample in a crucible to burn off organic matter, and calculate percentage loss in weight.
Water-Holding Capacity: Weigh a dry soil sample, saturate it with water, allow excess to drain, and re-weigh to calculate the amount of water retained.
pH Measurement: Prepare a soil suspension and measure its pH using a pH paper/indicator or a pH meter.
Data Recording: Record all observations and calculations in a tabular form for both soil samples.

Comparative data on the physical and chemical properties of soil from different locations, demonstrating variations in soil composition.

To analyze soil samples from two different sites for texture, moisture content, humus content, water-holding capacity, and pH.

Sample Collection: Collect representative soil samples from two distinct sites (e.g., garden soil, roadside soil, forest soil).
Texture Analysis:
- Sedimentation Method: Mix soil with water in a jar, allow to settle, and observe layers of sand, silt, and clay.
- Feel Method: Rub moist soil between fingers to estimate texture.
Moisture Content: Weigh a fresh soil sample, dry it in an oven, and re-weigh to calculate percentage moisture loss.
Humus Content: Ignite a dried soil sample in a crucible to burn off organic matter, and calculate percentage loss in weight.
Water-Holding Capacity: Weigh a dry soil sample, saturate it with water, allow excess to drain, and re-weigh to calculate the amount of water retained.
pH Measurement: Prepare a soil suspension and measure its pH using a pH paper/indicator or a pH meter.
Data Recording: Record all observations and calculations in a tabular form for both soil samples.

Comparative data on the physical and chemical properties of soil from different locations, demonstrating variations in soil composition.