Waec Model Questions Vol1 2017 Agricultural Science Question 2

Practice practical question 2 from the 2017 Waec Model Questions Vol1 Agricultural Science examination. This question covers Soil water holding capacity, Irrigation requirement, Soil management .

Waec Model Questions Vol1 2017 Agricultural Science Practical
Topics: Soil water holding capacity Irrigation requirement Soil management
Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2017 • AGRICULTURAL_SCIENCE • practical

A soil sample taken from a cultivated field gave the following properties: bulk density = 1.35 g cm⁻³, field capacity = 0.28 cm³ cm⁻³, wilting point = 0.15 cm³ cm⁻³. The effective rooting depth of the crop is 30 cm and the field area is 1 ha.

Question Parts

( a )
Calculate the total amount of plant‑available water stored in the root zone. Express your answer in (i) millimetres of water depth and (ii) cubic metres of water for the whole hectare.
( b )
The crop requires 5 mm of water per day for 10 consecutive days. Determine whether the stored plant‑available water is sufficient, and if not, calculate the additional irrigation water required (in mm).
( c )
Suggest two agronomic practices that could increase the plant‑available water holding capacity of this soil and briefly explain how they achieve this.

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About This Question

This is Waec Model Questions Vol1 2017 Agricultural Science Question 2. It is one of the practical questions from the 2017 Waec Model Questions Vol1 Agricultural Science examination.

The question covers Soil water holding capacity, Irrigation requirement, Soil management .

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