Question

Alluvial soil which occupies Alwar, Bharatpur, Jaipur and Sawai Madhopur and the central part of Ganganagar district is deficient in ____________
A. Lime
B. Phosphoric acid
C. Humus
D. All of these

Answer 1

Hint:Alluvial soil in Rajasthan is found in the northeastern side which is more fertile.
Alluvial soil is formed by silt deposits, so the chances of finding high mineral content in such soil is low.
Humus, phosphoric acid and lime are all substances which are found in varying levels of alluvial soil, depending on which region the soil is from.

Complete answer:
The soil in the state of Rajasthan is divided into seven different types. The fertility if the soil improves from west and northwest side towards the east and northeast side. Alluvial soil is one out of the seven different types. It is found in Alwar, Bharatpur, Jaipur and Sawai Madhopur and the central part of Ganganagar district. All these districts lie in the northeastern part of Rajasthan.

A. Lime is present in most alluvial soil samples. It is most commonly found as nodules in the old alluvium soil, also called bhangar soil. But the alluvial soil in the given districts in Rajasthan lack lime.
B. Phosphoric acid is usually present in alluvial soil. But soil from a few regions does not contain it. It is lacking from the soil of the districts mentioned in the question.
C. Humus is what usually makes any soil fertile. But the soil found in given northeastern districts of Rajasthan is lacking in Humus.
D. Since the soil of Alwar, Bharatpur, Jaipur and Sawai Madhopur and the central part of Ganganagar district lacks lime, phosphoric acid and humus, this is the correct answer.

Hence the correct answer is option D.

Note:Alluvial soil is generally divided into two types- new and old alluvium. They are also called khadar and bhangar soil. Alluvial soil consistency ranges from drift sand and rich, loamy soil to silty clays.
Wheat, rice, cotton, tobacco and other wide varieties of crops are grown in the soil of northeastern districts of Rajasthan.