17th October 2019

wikipedia

16

Why black soil is black?

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Yellow or red soil indicates the presence of oxidized ferric iron oxides. Dark brown or black color in soil indicates that the soil has a high organic matter content. Wet soil will appear darker than dry soil.

Also question is, what can be grown in black soil?

Black soil is rich in calcium, potassium and magnesium but has poor nitrogen content. Crops like cotton, tobacco, chilly, oil seeds, jowar, ragi and maize grow well in it. Sandy soil is low in nutrient content but is useful for growing trees such as coconut, cashew and casuarinas in areas with high rainfall.

What is a black soil?

Black soil may refer to: Chernozem, fertile black soils found in eastern Europe, Russia, India and the Canadian prairies. Muck (soil), a soil made up primarily of humus from drained swampland. Vertisol, dark cracking soils with a high clay content found between 50° N and 45° S of the equator.

Why black soil is called black?

P.S : It is commonly known as "black cotton soil" as they are perfect for growing cotton. They develop deep cracks in extreme hot weather. Black soils or cotton soils or regur soil represent same. However, the name "Regur" is derived from Latin word.

1

Which is the best soil for plant growth?

The Ideal Soil Type: Loam. The type of soil that gardens and gardeners love is loamy soil. It contains a balance of all three soil materials—silt, sand and clay—plus humus. It has a higher pH and calcium levels because of its previous organic matter content.

2

How does soil texture vary with depth?

Clay soils generally hold more water, and are better at supplying nutrients. Texture often changes with depth so roots have to cope with different conditions as they penetrate the soil. A soil can be classified according to the way the texture changes with depth.

3

What causes dirt to be purple?

Red, yellow, or brown tints to soil indicate the presence of iron oxide. Soils that appear white have more carbonates, such as salts. Progressions of decomposing organic matter make soil dark brown or even black, a purple or purplish black soil color has probably been affected by manganese oxides.

4

Where red soil is found?

Red Soil in India lacks in phosphorus, nitrogen and lime contents. The red soils cover a large portion of land in India. It is found in Indian states such as Tamil Nadu, southern Karnataka, north-eastern Andhra Pradesh and some parts of Madhya Pradesh, Chhattisgarh and Odisha.

5

What is white soil?

white soil with lime nodules (white-eye, beloglaska) are non-stratified, geologically recent deposits of silty or loamy material, deposited by the wind and cemented together with calcium carbonateconcretions. The word "White-eye" is sometimes used as a synonym for loess loam.

6

How old is the soil?

"It depends on what you mean by dirt," says Milan Pavich, a research geologist with the U.S. Geological Survey. "The oldest sedimentary rocks are about 3.9 billion years old—they're in Greenland—and at one time, they were dirt. That's pretty close to the time the Earth formed."

7

How humus is formed in the soil?

It is an important biological constituent of fertile soil . Humus is formed by the decomposing action of soil microorganisms (e.g., bacteria and fungi), which break down animal and vegetable material into elements that can be used by growing plants.

8

Why do plants grow so well in volcanic soil?

Volcanoes soil are also know as andisols. Andisols are formed from volcanic ash. Volcanic materials break down and weather to form some of the most fertile soils on Earth. Volcanic ash often contain minerals that are beneficial to plants, and if it is very fine ash it will break down quickly and get mixed into soil.

9

What makes up the soil?

The particles that make up soil are categorized into three groups by size: sand, silt, and clay. Sand particles are the largest and clay particles the smallest. Although a soil could be all sand, all clay, or all silt, that's rare.

10

What factors influence the Colour of the soil?

Four main factors influence the colour of a soil:

Mineral matter derived from the constituents of the parent material.
Organic matter.
The nature and abundance of iron.
Moisture content.

11

Why red soil is red?

Their colour is mainly due to ferric oxides occurring as thin coatings on the soil particles while the iron oxide occurs as haematite or as hydrous ferric oxide, the colour is red and when it occurs in the hydrate form as limonite the soil gets a yellow colour.

12

Why is it important to know the texture of a soil?

Soil texture is an important soil characteristic that influences stormwater infiltration rates. The textural class of a soil is determined by the percentage of sand, silt, and clay. Soils can be classified as one of four major textural classes: (1) sands; (2) silts; (3) loams; and (4) clays.

13

How laterite soil is formed?

Laterite is a soil and rock type rich in iron and aluminium, and is commonly considered to have formed in hot and wet tropical areas. Nearly all laterites are of rusty-red coloration, because of high iron oxide content. They develop by intensive and long-lasting weathering of the underlying parent rock.

14

What is the definition of soil texture?

6.0 Definition of soil texture. Texture indicates the relative content of particles of various sizes, such as sand, silt and clay in the soil. Texture influences the ease with which soil can be worked, the amount of water and air it holds, and the rate at which water can enter and move through soil.

15

What is the structure of soil?

Soil structure refers to the arrangement of soil separates into units called soil aggregates. An aggregate possesses solids and pore space. Aggregates are separated by planes of weakness and are dominated by clay particles. Silt and fine sand particles may also be part of an aggregate.

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Why are the three separates found in soil What size are they?

Three categories for soil particles have been established — sand, silt and clay. The three groups are divided by their particle size. Clay particles are the smallest, while sand particles are the largest. The size ranges for the soil separates and the relative size of the particles are shown in Figure 2.2.

17

What is a Munsell soil color chart?

The Munsell Soil Color Charts is an affordable way to evaluate the type of soil that is present within a given area. The book is set up to allow users to make soil color evaluations in the field quickly and easily.

18

What color is humus soil?

The dark, usually brown or black, color of humus helps to warm cold soils in Spring.

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What is the color of the sandy soil?

Soils high in iron are deep orange-brown to yellowish-brown. Those soils that are high in organic matter are dark brown or black. Color can also tell us how a soil “behaves” – a soil that drains well is brightly colored and one that is often wet and soggy will have a mottled pattern of grays, reds, and yellows.

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What is the Colour of subsoil?

As it is lacking in dark humus, subsoil is usually paler in colour than the overlying topsoil. It may contain the deeper roots of some plants, such as trees, but a majority of plant roots lie within the surface topsoil.

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