Waec Model Questions Vol1 2024 Agricultural Science Question 2

Practice practical question 2 from the 2024 Waec Model Questions Vol1 Agricultural Science examination. This question covers Soil texture determination, Water holding capacity, Soil suitability for crops .

Waec Model Questions Vol1 2024 Agricultural Science Practical
Topics: Soil texture determination Water holding capacity Soil suitability for crops
Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • AGRICULTURAL_SCIENCE • practical

A soil sample was taken from a newly cultivated field to evaluate its suitability for maize production. The following laboratory data were obtained: 1. Dry weight of the 200 g air‑dry soil sample = 200 g (by definition). 2. After saturating the sample with water, the saturated weight = 260 g. 3. After allowing the sample to drain to field capacity, the weight = 240 g. 4. Particle‑size analysis of the same 200 g dry sample gave: - Sand = 120 g - Silt = 50 g - Clay = 30 g Using the information above, answer the questions that follow.

Question Parts

( a )
Determine the percentage of sand, silt and clay in the sample and state the USDA soil‑texture class (use the standard triangle classification).
( b )
Calculate the gravimetric water content at field capacity (θ_g) and then convert it to volumetric water content (θ_v) assuming a bulk density of 1.4 g cm⁻³. Use the relationship θ_v = θ_g × (ρ_b / ρ_w) where ρ_w = 1 g cm⁻³.
( c )
Based on the texture class and the field‑capacity water content obtained, evaluate the suitability of the soil for maize and recommend ONE soil amendment that could improve its performance.

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About This Question

This is Waec Model Questions Vol1 2024 Agricultural Science Question 2. It is one of the practical questions from the 2024 Waec Model Questions Vol1 Agricultural Science examination.

The question covers Soil texture determination, Water holding capacity, Soil suitability for crops .

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