Soils

With reference to agricultural soils, consider the following statements

With reference to agricultural soils, consider the following statements:

1. A high content of organic matter in soil drastically reduces its water holding capacity.
2. Soil does not play any role in the sulphur cycle.
3. Irrigation over a period of time can contribute to the salinization of some agricultural lands.

Which of the statements given above is/are correct?

1. 1 and 2 only
2. 3 only 
3. 1 and 3 only 
4. 1, 2 and 3

Which methods are suitable for soil conservation in hilly regions

Which of the following methods is/are suitable for soil conservation in hilly regions?

1. Terracing and contour bunding
2. Shifting cultivation
3. Contour ploughing

Select the correct answer using codes given below:

1. Only 2
2. Only 3
3. 1 and 3
4. 1, 2 and 3

Which is a micro nutrient present in soil for various crops

Which one among the following is a micro nutrient present in soil for various crops?

1. Potassium
2. Magnesium
3. Calcium
4. Manganese

Which statements regarding laterite soils of India are correct

Which of the following statements regarding laterite soils of India are correct?

• 1. They are generally red in colour.
• 2. They are rich in nitrogen and potash.
• 3. They are well-developed in Rajasthan and UP.
• 4. Tapioca and cashew nuts grow well on these soils.

Select the correct answer using the codes given below.

1. 2 and 3
2. 1 and 4
3. 2, 3 and 4
4. 1, 2 and 3