Soil Science - Study Mode

[#526] Gleization, pedogenic process occur in
Correct Answer

(C) Bog soil

Explanation

Solution: Gleization is the pedogenic process of soil formation under an anaerobic environment and leads to the development of a gley horizon in the lower part of the soil profile with green-blue colours above the parent material due to poor drainage conditions, related to the reduction of soluble ferrous iron under water-logged conditions. This pedogenic process occurs in Bog soil, which is oxygen and nutrient deficient and is much more acidic than other soils.

[#527] During Urea hydrolysis pH of the soil system attains a value
Correct Answer

(C) 9.0

Explanation

Solution: During Urea hydrolysis pH of the soil, the system attains a value of 9.0. Urea hydrolysis is a chemical reaction that occurs in soils, to transform the urea in urine into ammonia and bicarbonate, resulting in ammonia volatilization and mineral scaling. The pH is shifted from 6.8 to 9 and is detected by the change of colour of phenol red from light orange to magenta.

[#528] Nutrient movement slows down in a dry soil due to
Correct Answer

(A) Less water

Explanation

Solution: Nutrient movement slows down in dry soil due to Less water. The nutrient is mixed with water and thus transported around the soil and ultimately to the plant parts through roots. In dry soil, because of deficiency of water nutrient is not dissolved and thus not absorbed by roots, which slows down the movement of nutrients.

[#529] Harvest index is 100% for
Correct Answer

(A) Fodders

Explanation

Solution: Harvest index (HI) indicates and is referred to as the ratio of grain to total shoot dry matter and is a measure of reproductive efficiency. It is calculated as: $${ ext{Harvest index}}left( \%
ight) = { ext{ }}frac{{{ ext{Grain yield}}}}{{{ ext{Biological yield}}}} imes 100$$ The harvest index is 100% for fodders.

[#530] Lithosol, Regosol come under
Correct Answer

(B) Azonal

Explanation

Solution: Lithosol, Regosol come under the category of Azonal soil. Azonal soil is a major group of soil often classified as a category of the highest rank and embracing soils that lack well-developed horizons because of immaturity or other factors that have prevented their development. It is the soil that has been developed by the process of deposition by the agents of erosion.