Waec Model Questions Vol1 2018 Agricultural Science Question 2

Practice essay / theory question 2 from the 2018 Waec Model Questions Vol1 Agricultural Science examination. This question covers Soil Science, Soil Water Retention, Field Capacity, Permanent Wilting Point, Soil Physical Properties .

Waec Model Questions Vol1 2018 Agricultural Science Essay / Theory
Topics: Soil Science Soil Water Retention Field Capacity Permanent Wilting Point Soil Physical Properties
Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • AGRICULTURAL_SCIENCE • essay

The illustration shows a laboratory pressure‑plate apparatus used to determine the field capacity (FC) and permanent wilting point (PWP) of a soil sample by applying different matric potentials.

Question Parts

( a )
Explain the principle by which the pressure‑plate apparatus determines field capacity and permanent wilting point.
( b )
In the experiment, 200 g of oven‑dry soil is placed in the holder. At a pressure of 0.33 bar the water retained after drainage is measured as 80 g. At a pressure of 15 bar the water retained is 30 g. Calculate the field capacity and the permanent wilting point of the soil, expressed as % gravimetric water content.

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About This Question

This is Waec Model Questions Vol1 2018 Agricultural Science Question 2. It is one of the essay questions from the 2018 Waec Model Questions Vol1 Agricultural Science examination.

The question covers Soil Science, Soil Water Retention, Field Capacity, Permanent Wilting Point, Soil Physical Properties .

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