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

1. Due to fast drainage, it has been vulnerable to soil erosion.

2. It is very helpful to those crops which need favorable air and water drainage which is provided by this soil by virtue of being on slopes.

3. It is poor in Organic and Humus content but rich in other nutrients.

4. Due to less scope of agriculture, Silvi pastoral farming can be sustained.

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