Neco 2025 Agricultural Science Question 2

Practice practical question 2 from the 2025 Neco Agricultural Science examination. This question covers Soil Science .

Neco 2025 Agricultural Science Practical

Topic: Soil Science

Question 2 NECO • 2025 • AGRICULTURAL_SCIENCE • practical

A researcher collects a soil core of 7 cm diameter and 10 cm length from a cultivated field. The following measurements are obtained: - Fresh (undisturbed) weight of the core: 850 g - Oven‑dry weight (105 °C to constant weight): 620 g - Saturated weight (after soaking the core): 950 g - Weight after allowing drainage for 30 min (field capacity): 770 g - Weight of a separate saturated sample after drying to permanent wilting point: 830 g - Particle density of the soil (assumed): 2.65 g cm⁻³ Using these data, answer the questions below. (Assume 1 g water = 1 cm³.)

( a )

Calculate the bulk density (\(\rho_b\)) of the soil in g cm⁻³.

( b )

Determine the total porosity (n) of the soil as a percentage.

( c )

Compute the gravimetric water content (\(\theta_g\), % dry weight) at field capacity and at permanent wilting point.

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This is Neco 2025 Agricultural Science Question 2. It is one of the practical questions from the 2025 Neco Agricultural Science examination.

The question covers Soil Science .

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