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Describe a laboratory or field experiment in relation to any two of the following: (a) The effect of structure formation on total pore space in soils - Leaving Cert Agricultural Science - Question 4 - 2007
Question 4
Describe a laboratory or field experiment in relation to any two of the following: (a) The effect of structure formation on total pore space in soils. (b) The dete... show full transcript
Worked Solution & Example Answer:Describe a laboratory or field experiment in relation to any two of the following: (a) The effect of structure formation on total pore space in soils - Leaving Cert Agricultural Science - Question 4 - 2007
Step 1
The effect of structure formation on total pore space in soils.
Answer
To study the effect of structure formation on total pore space in soils, we can perform the following experiment:
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Sample Preparation: Select two different soil samples that exhibit varying levels of structure. One should be compacted and the other should be loose.
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Measurement of Volume: Sieve both soil samples to remove larger particles, ensuring uniformity. Use graduated cylinders to measure an equal volume of each type of soil.
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Water Addition: Add a consistent volume of water to each soil sample separately and allow the samples to equilibrate. Record the volume of water added to each sample.
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Calculation: At the end of the experiment, measure the volume of water retained in each soil sample. The total pore space can be calculated by comparing the initial and final volumes of water. This can be expressed as:
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Comparison: Compare the calculated pore space between the compacted and loose soils to determine how structure formation affects total pore space.
Step 2
The determination of the percentage germination of a sample of seed.
Answer
To determine the percentage germination of a sample of seeds, follow these steps:
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Seed Selection: Take 100 seeds of a specific type and place them in a suitable container, such as a petri dish lined with wet paper.
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Maintaining Conditions: Ensure the seeds are placed in a suitable substrate. Maintain optimal conditions for germination by controlling temperature and moisture.
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Observation Period: Leave the seeds in a controlled environment for a fixed period, typically around 10 to 14 days. During this time, monitor and record the number of seeds that successfully germinate.
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Calculation of Germination Percentage: After the observation period, calculate the percentage of seeds that germinated using the formula:
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Reporting Results: Report the average percentage germination based on your observations for an accurate representation of seed viability.