FORESTRY
SOIL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Soil as a medium for plant growth can be described as a complex natural material derived from weathering of rocks and decomposition of organic materials, which provide nutrients, moisture and anchorage for plants.
Detailed explanation-2: -Soil plays a vital role in the Earth’s ecosystem and without soil, human life would be very difficult. Soil provides plants a foothold for their roots and holds the necessary nutrients for plants to grow. Soil filters the rainwater and regulates the discharge of excess rainwater, preventing flooding.
Detailed explanation-3: -The four components of soil include: mineral matter 45%, organic matter 5%, air 25%, and water 25%. Therefore, soil is 50% solid and 50% pore space.
Detailed explanation-4: -Soil is a major source of nutrients needed by plants for growth. The three main nutrients are nitrogen (N), phosphorus (P) and potassium (K). Together they make up the trio known as NPK. Other important nutrients are calcium, magnesium and sulfur.