Waec Model Questions Vol1 2019 Agricultural Science Question 2

Practice practical question 2 from the 2019 Waec Model Questions Vol1 Agricultural Science examination. This question covers Soil Science .

Waec Model Questions Vol1 2019 Agricultural Science Practical
Topic: Soil Science
Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • AGRICULTURAL_SCIENCE • practical

A soil sample was collected from a field intended for maize cultivation. The sample was air‑dried, passed through a 2 mm sieve and a 0.05 mm sieve, and the fractions were separated by sedimentation. The following masses were obtained: - Fresh (wet) soil sample: 250 g - Oven‑dry soil (105 °C, 24 h): 210 g - Sand fraction (retained on 0.05 mm sieve): 112 g - Silt fraction (passed 0.05 mm but retained on 0.002 mm): 78 g - Clay fraction (passed 0.002 mm): 20 g Assume no loss of material during processing. Answer the questions below:

Question Parts

( a )
Determine the percentage of sand, silt and clay on a dry‑weight basis.
( b )
Using the soil textural triangle, state the soil textural class of the sample.
( c )
Discuss two possible sources of error that could affect the accuracy of the texture determination.
( d )
Recommend one soil management practice suitable for the identified texture to improve water retention for maize, and give a brief justification.

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About This Question

This is Waec Model Questions Vol1 2019 Agricultural Science Question 2. It is one of the practical questions from the 2019 Waec Model Questions Vol1 Agricultural Science examination.

The question covers Soil Science .

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