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Compare limestone and granite as parent materials in soil formation. - Leaving Cert Agricultural Science - Question g - 2012
Question g
Compare limestone and granite as parent materials in soil formation.
Worked Solution & Example Answer:Compare limestone and granite as parent materials in soil formation. - Leaving Cert Agricultural Science - Question g - 2012
Step 1
Limestone as a Parent Material
Answer
Limestone is an alkaline material with a high pH value, contributing to a favorable soil structure. It contains calcium, which enhances the soil's ability to hold nutrients. Limestone also provides good drainage and is optimal for the absorption of minerals. Its intermediate texture promotes better ion exchange, resulting in fertile soils.
Step 2
Granite as a Parent Material
Answer
In contrast, granite is an acidic parent material. The leaching processes associated with granite can lead to the formation of podzol soils, which are often infertile. This leaching can result in a coarse soil texture, which is less efficient for ion exchange. Overall, granite tends to produce soils that retain fewer nutrients compared to limestone.