Neco 2024 Agricultural Science Question 2

Practice practical question 2 from the 2024 Neco Agricultural Science examination. This question covers Soil Science .

Neco 2024 Agricultural Science Practical

Topic: Soil Science

Question 2 NECO • 2024 • AGRICULTURAL_SCIENCE • practical

A soil sample weighing 250 g (air‑dry) is tested for pH using the 1:2.5 soil‑to‑water suspension method. The measured pH of the suspension is 5.2. The buffer capacity of the soil is 0.8 cmolc kg⁻¹ per pH unit. A farmer wishes to raise the soil pH to 6.5 for optimal soybean production. The lime material to be used is calcium carbonate (CaCO₃) with an effective neutralising value (ENV) of 90 %. The bulk density of the field soil is 1.4 g cm⁻³.

Question Parts

( a )

Determine the amount of CaCO₃ (in grams) required to raise the pH of the 250 g sample to the target pH, assuming the same buffer capacity applies.

( b )

If the farmer plans to treat a field of 1 ha with a soil depth of 15 cm, calculate the total quantity of CaCO₃ (in kilograms) needed for the whole field.

( c )

List two practical precautions that should be observed when applying lime to the field.

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About This Question

This is Neco 2024 Agricultural Science Question 2. It is one of the practical questions from the 2024 Neco Agricultural Science examination.

The question covers Soil Science .

View More Neco 2024 Agricultural Science Questions More Neco Practice Questions Back to Questions

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