FORESTRY
SOIL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Compacted soils reduce the availability of water and oxygen to plant roots
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Soils with large amounts of porespace enable roots to absorb more water and soil
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Soils with small amounts of porespace are less likely to undergo nutrient leaching
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Compacted soils have less porespace, which reduces the availability of water, nutrients and oxygen
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All of the above are accurate
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Detailed explanation-1: -Soil compaction can lead to: poor root growth-which reduces crop yield through poor water and nutrient uptake. difficulties with soil cultivation and seedbed preparation. a decrease in water entering the soil either as rain or irrigation.
Detailed explanation-2: -It is the densification of soil by application of mechanical energy which occurs when soil particles are pressed together, reducing pore space between them. This compaction of soil depends on many factors like water content, compaction effort, type of soil, method of compaction etc.
Detailed explanation-3: -Soil compaction also increases resistance to root penetration, making it difficult for roots to grow deeper through the soil. This can lead to the development of a shallow root system, poor plant growth, increased need for irrigation and fertilization. A plant under stress is also prone to attack by pests and diseases.