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The table below shows the results of soil tests carried out on samples from three different fields - Leaving Cert Agricultural Science - Question 2 - 2013
Question 2
The table below shows the results of soil tests carried out on samples from three different fields. Field 1. A field sown with barley for the previous three years. ... show full transcript
Worked Solution & Example Answer:The table below shows the results of soil tests carried out on samples from three different fields - Leaving Cert Agricultural Science - Question 2 - 2013
Step 1
Match each field with its appropriate result and justify your choice in each case.
Answer
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Field 1 (barley): Result A (high nitrogen, high phosphorus, low potassium) because barley requires high nitrogen for growth, and the previous years of farming contributed to nutrient depletion.
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Field 2 (ploughed-in ley): Result B (low nitrogen, medium phosphorus, low potassium) as ploughed-in ley typically adds nutrients but may have lower nitrogen after a ley due to decomposition.
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Field 3 (dairy paddock): Result C (medium nitrogen, medium phosphorus, medium potassium) since dairy cattle contribute organic matter and nutrients, resulting in balanced levels.
Step 2
Step 3
State any two of the standards with which ground limestone must comply before it can be sold.
Answer
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Must pass through sieve 3.35 mm mesh, with a maximum of 2% water content when tested in accordance with TNV guidelines.
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Trace element levels must not exceed specified limits to ensure safety for agricultural use.
Step 4
Mention two consequences of over-liming.
Answer
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Over-liming can lead to nutrient imbalances, reducing the availability of micronutrients like copper and boron which are essential for plant growth.
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Excess lime can harm soil structure, reducing its ability to retain moisture and support healthy microbial populations.
Step 5
Describe an investigation to determine the pH of a soil.
Answer
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Collect a small quantity of soil and deionised (distilled) water in a clean container.
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Filter the mixture to remove solid particles, obtaining a clear soil solution.
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Measure the pH using either a pH meter or a colorimetric pH test with universal indicator, recording any color changes to determine the pH level.