Question

explain about black soil​

Answer 1

Answer:

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1st category Black Soils (the most vulnerable and endangered, needing the highest rate of protection at a global level) are those having all five properties given below:

The presence of black or very dark surface horizons typically with a chroma of ≤3 moist, a value of ≤3 moist and ≤5 dry (by Munsell colours);

The total thickness of black surface horizons ≥25 cm;

Organic carbon content in the upper 25-cm of the black horizons of ≥1.2% (or ≥ 0.6% for tropical regions) and ≤20%;

CEC in the black surface horizons ≥25 cmol/kg; and

A base saturation in the black surface horizons ≥50%.

Most but not all 1st category Black soils:

Have well-developed granular or fine sub-angular structure and high aggregate stability in the black surface horizons that are in a non- or slightly degraded state, or in the humus-rich underlying horizon which has not been subjected to degradation.

2nd category Black soils (mostly endangered at the national level) are those having all three properties given below:

The presence of black or very dark surface horizons typically with a chroma of ≤3 moist, a value of ≤3 moist and ≤5 dry (by Munsell colours);

The total thickness of the black surface horizons of ≥25 cm; and

Organic carbon content in the upper 25-cm of the black horizons ≥1.2% (or ≥ 0.6% for tropical regions) and ≤20%.

Black Soils definition endorsed by the 11th Working Session of the Intergovernmental Technical Panel on Soils (21/11/2019, FAO HQ)

Black soils are mineral soils which have a black surface horizon, enriched with organic carbon that is at least 25 cm deep. Two categories of black soils (1st and 2nd categories) are recognized. ... A base saturation in the black surface horizons ≥50%.

Answer 2

Answer:

Black soil

These soils are black in color and are also

known as regur soil.

Black soil is ideal for growing cotton.

This type of soil is typical of the Decaan trap

(Basalt) region spred over Northwest Deccan

plateau and is made up of lava flows.

They cover the plateau of Maharashtra, Malwa,

Madhya Pradesh etc..

The black soils are made up of extremely fine i. e.

clayey material. They are well known for their

capacity to hold moisture. In addition, they ere

rich in soil nutrients, such as calcium carbonate,

magnesium, potash and lime.

These soils are generally poor in phosphoric

contents..

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