. How is soil a facilitator for percolation and retention of water?
9. Which organisms are found in soil? What is their importance?
(ii) Alluvial soil and Till
(iii) Sedimentary soil and Loamy soil.
5. What causes differences in soil types?
6. What are characteristics of fertile soils?
7. How does soil aid in plant growth?
8. Write briefly about acidic and alkaline soils.
Answers
Answer:
When all the pore spaces are filled ,the water molecules beyond certain distance from soil molecules are subjected to gravitational force and moves down as percolation. This is the water which enrich ground water which is aviation through wells. Thus soil is facilitator for retention and percolation.
Explanation:
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Answer:
When all the pore spaces are filled ,the water molecules beyond certain distance from soil molecules are subjected to gravitational force and moves down as percolation. This is the water which enrich ground water which is aviation through wells. Thus soil is facilitator for retention and percolation
Fungi are abundant in soil, but bacteria are more abundant. Fungi are important in the soil as food sources for other, larger organisms, pathogens, beneficial symbiotic relationships with plants or other organisms and soil health
Till is glacial origin and alluvium is fluvial origin. ... Tills are generally unmixed coarse and fine rock fragments angular to sub angular in shape. While alluvium is loose, unconsolidated sediments of clay, silt and sand
Sedimentary soils formed from deposited silt and clay are found in the Pajala and Kolari regions and widespread along the lowermost part of the river
Temperature and precipitation are the main climate factors that make soils different from one another. Precipitation determines how much water moves through the soil, and minerals and salts dissolve in, and move with, the water. ... Soils also differ from one another thanks to the shape of the landscape, or relief.
Fertile soil has the following characteristics:
It is rich in nutrients necessary for basic plant nourishment. This includes nitrogen, phosphorus and potassium.
It consists of adequate minerals such as boron, chlorine, cobalt, copper, iron, manganese, magnesium, molybdenum, sulphur and zinc. These minerals promote plant nutrition.
It contains soil organic matter that improves the structure of the soil. This enables the soil to retain more moisture.
The soil pH is in the range 6.0 to 6.8.
It has a good soil structure which results in well-drained soil.
It consists of a variety of micro-organisms that support plant growth.
It often contains large amounts of topsoil
Soil supports plant growth by providing: ... Oxygen: the spaces among soil particles contain air that provides oxygen, which living cells (including root cells) use to break down sugars and release the energy needed to live and grow.
The pH scale indicates acidity or alkalinity. A soil with a pH number below 7 is acid, while one with a pH above 7 is alkaline. Garden plants typically grow best in neutral or slightly acid soil (pH 7 or slightly below; see illustration at left). ... Alkaline soils, in contrast, are typically found in low-rainfall areas.