A soil sample is mixed with water in a graduated cylinder and allowed to settle as shown in the diagram - Leaving Cert Agricultural Science - Question a - 2018
Question a
A soil sample is mixed with water in a graduated cylinder and allowed to settle as shown in the diagram.
(i) What soil component is found at A?
(ii) What is the pr... show full transcript
Worked Solution & Example Answer:A soil sample is mixed with water in a graduated cylinder and allowed to settle as shown in the diagram - Leaving Cert Agricultural Science - Question a - 2018
Step 1
What soil component is found at A?
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Answer
The soil component found at point A, which is the uppermost layer in the graduated cylinder after mixing, is typically organic matter or fine sand, as it tends to settle last.
Step 2
What is the principal type of soil particle found in B?
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Answer
The principal type of soil particle found at B, which is closer to the bottom of the graduated cylinder, is coarse sand, as indicated by its position and size.
Step 3
1. Would this soil have poor or good drainage?
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Answer
This soil would have good drainage.
Step 4
2. Explain your answer.
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Answer
The presence of coarse sand at B suggests that the soil structure allows water to pass through easily. Coarse particles create larger spaces between them, which promotes effective drainage, preventing water from pooling.
Step 5
State two reasons for poor soil drainage:
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Answer
Compact soil particles that decrease porosity and water infiltration.
High clay content that retains water due to its fine texture.
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