Soil Science - Study Mode

[#336] In Gujarat, the deltaic alluvium soil which are sandy loam to silty clay loam in texture are called
Correct Answer

(D) Goradu soils

Explanation

Solution: In Gujarat, the deltaic alluvium soil which is sandy loam to silty clay loam in texture is called Goradu soil . This is alluvial in origin and belongs to the order Alfisol. The texture of the soil is loamy sand. The soil is deep enough to respond well to manuring and a variety of crops of the tropical and sub-tropical regions. The organic matter content of only 0.67% and available B varies from 0.3 to 0.5 ppm.

[#337] Ligand adsorption of weak acid anion is maximum at a pH which is
Correct Answer

(A) Equal to pK of weak acid

Explanation

Solution: Ligand adsorption of weak acid anion is maximum at a pH that is equal to the pK of a weak acid. pK is a measure of the strength of an acid on a logarithmic scale. And pK value is given by log 10 (1/K a ), where K a is the acid dissociation constant. The mode of adsorption of ligands depends on the bond polarity of the linking atoms of the ligand.

[#338] Most common 5 deficient nutrients in soils are N, P, K, S and . . . . . .
Correct Answer

(B) Zn

Explanation

Solution: There is a total of 17 essential nutrient elements required by plants for their growth and development, which are further classified as macronutrients which are required in large amounts, and micronutrients which are required in fewer amounts. The most common 5 deficient nutrients in soils are Nitrogen, Phosphorus, Potassium, Sulphur and the other one is Zinc . These nutrients are most commonly added as fertilizers to plants.

[#339] 'Humus' is made up of
Correct Answer

(C) Both A and B

Explanation

Solution: Humus is the dark organic matter in soil that is formed by the decomposition of plant and animal matter. It is rich in nutrients and retains moisture in the soil. Humus is made up of both Humic materials and non-humic materials. Humic materials include major components of the natural organic matter in the soil and water like lake sediments, peats, brown coals and shales. Non-humic substances are compounds related to biochemistry such as sugars, amino acids, fats, etc.

[#340] In humid weather, the fertiliser suffering most damage in one whose
Correct Answer

(A) CRH is lowest

Explanation

Solution: In humid weather, the fertilizer suffers the most damage in one whose CRH is lowest and it absorbs the moisture from the atmosphere. CRH is the Critical Relative Humidity of any substance and it is defined as the relative humidity of the surrounding atmosphere at which the material begins to absorb moisture from the atmosphere and below which it will not absorb atmospheric moisture.