Question

_____ soil is known as regur.
1. Laterite
2. Red
3. Black
4. Brown

Answer 1

Hint: In Central India and the Deccan Plateau, the Regur soils are mainly found. For growing cotton, the soil is suitable.These soils are rich in calcium carbonate, magnesium carbonate, potash, and lime.

Complete answer:
1. It is the black soil which is also known as regur.
2. Owing to the presence of iron, aluminum compounds and humus, these soils are black in color.
3. These are strongly argillaceous, i.e. argillaceous. It is deep and impermeable, and therefore has a high potential for water retention.
4. Such soils are mineral-rich and known for their fertility.
5. The depth of the soil ranges from place to place. In the lowlands, it is very dense, but in the highlands it is very thin. Also the black soil is very thick in the upper reaches of the Godavari and Krishna, and the northwestern portion of the Deccan Plateau.
6. When wet, these soils swell and become sticky and when dry, develop deep large cracks. This assists in self-aeration, which contributes to atmospheric absorption of nitrogen. Thus there is a type of self-plough. This intense aeration and oxidation helps to preserve the fertility of these soils. This continued fertility is favorable even without irrigation in the region of low rainfall for cotton cultivation.
7. The black soil retains moisture for a very long time due to slow absorption and loss of moisture, which helps crops, particularly rain-fed ones, to maintain even during the dry season.
8. These soils are highly fertile and are well suited to cotton, pulses, millets, linseed, tobacco, sugarcane, vegetables and citrus fruit cultivation.
The answer is 3. Black

Note:
Black soils are mostly found in near proximity to red soils in the southern and eastern parts of the country where rainfall is high. Black soils dominate low-level valleys and areas, whereas red soils are found on higher slopes and hill tops. In Coimbatore, Madurai, Tirunelveli (Tamil Nadu) and the Bundelkhand area, mixed black and red soils occur.