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Describe the rhizosphere - Leaving Cert Agricultural Science - Question a(i) - 2021
Question a(i)
Describe the rhizosphere. The rhizosphere is the zone of soil that is directly influenced by root secretions and associated soil microorganisms. It spans a few mill... show full transcript
Worked Solution & Example Answer:Describe the rhizosphere - Leaving Cert Agricultural Science - Question a(i) - 2021
Step 1
Explain the importance of the rhizosphere to the root system of a plant.
Answer
The rhizosphere is crucial for the root system of a plant as it enhances nutrient absorption and provides a habitat for beneficial microorganisms. Roots release exudates into the rhizosphere, which attract these microorganisms, including bacteria and fungi, that help in breaking down organic material and converting nutrients into forms readily available for uptake by the plant. Additionally, the presence of mycorrhizal fungi in this region helps improve water and nutrient absorption, creating a mutualistic relationship that significantly benefits plant health and growth.
Step 2
Briefly describe the impact regular soil cultivation and conventional farming practices may have on the rhizosphere.
Answer
Regular soil cultivation and conventional farming practices can disrupt the structure of the rhizosphere, leading to a reduction in microbial diversity and density. Disturbance from tillage can damage the root systems and alter the balance of beneficial microorganisms, which may negatively impact nutrient cycling and overall soil health. Furthermore, the use of chemical fertilizers and pesticides can adversely affect microbial populations, diminishing the effectiveness of natural processes that support plant growth.