FORESTRY
SOIL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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clay
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sand
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humus
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silt
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Detailed explanation-1: -When water is added to soil, it can replace the oxygen that is naturally in the soil, and make the soil darker. This means wetter soil will have less oxygen compared with drier soil. When enough water is added, soil can become saturated and the water will start to form a layer on top of it.
Detailed explanation-2: -Generally speaking, clay-rich soils have the largest pore space, hence the greatest total water holding capacity.
Detailed explanation-3: -Since plant roots require water and oxygen (from the air in pore spaces), maintaining the balance between root and aeration and soil water availability is a critical aspect of managing crop plants.
Detailed explanation-4: -It is made up mainly of mineral particles, organic materials, air, water and living organisms-all of which interact slowly yet constantly. Most plants get their nutrients from the soil and they are the main source of food for humans, animals and birds.