write important feature of alluvial soil and black soil? 5 points
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Alluvial Soil
The proportion of nitrogen is generally low.The proportion of Potash, phosphoric acid and alkalies are adequateThe proportion of Iron oxide and lime vary within a wide range.
Black Soil
A typical black soil is highly argillaceous [Geology (of rocks or sediment) consisting of or containing clay] with a large clay factor, 62 per cent or more.In general, black soils of uplands are of low fertility while those in the valleys are very fertile.The black soil is highly retentive of moisture. It swells greatly on accumulating moisture. Strenuous effort is required to work on such soil in rainy season as it gets very sticky.In summer, the moisture evaporates, the soil shrinks and is seamed with broad and deep cracks. The lower layers can still retain moisture. The cracks permits oxygenation of the soil to sufficient depths and the soil has extraordinary fertility.
The proportion of nitrogen is generally low.The proportion of Potash, phosphoric acid and alkalies are adequateThe proportion of Iron oxide and lime vary within a wide range.
Black Soil
A typical black soil is highly argillaceous [Geology (of rocks or sediment) consisting of or containing clay] with a large clay factor, 62 per cent or more.In general, black soils of uplands are of low fertility while those in the valleys are very fertile.The black soil is highly retentive of moisture. It swells greatly on accumulating moisture. Strenuous effort is required to work on such soil in rainy season as it gets very sticky.In summer, the moisture evaporates, the soil shrinks and is seamed with broad and deep cracks. The lower layers can still retain moisture. The cracks permits oxygenation of the soil to sufficient depths and the soil has extraordinary fertility.
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