Question

Consider the following statements.

1. Only the U.S Soil Taxonomy principal system is used for soil classification today.

2. Erosion losses are usually very small from forestland

Which of the is/are correct?

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 and 2

Answer 1

Correct Answer - Option 2 : Only 2

The correct answer is Option 2, i.e 2 only.

• There are two principal systems of soil classification in use today - the U.S. Soil Taxonomy and the soil group system, published as the World Reference Base for Soil Resources, developed by the Food and Agriculture Organization (FAO) of the United Nations. Hence, statement 1 is correct.
• Both of these systems are morphogenetic, in that they use structural properties as the basis of classification while also drawing on the five factors of soil formation described in the previous section in choosing which properties to emphasize.
• When climate and topography are fixed and soil cover is varied, the rate of soil loss by water erosion has a predictable and dramatic dependence on vegetation
• Irrespective of location, erosion losses are usually very small from forestland or permanent pastureland, moderate to high from land planted with grain crops, and very high from clean-tilled orchards, vineyards, and land planted with row crops.