Dolomite powder is often applied to agricultural lands to increase the pH of the soil. pH is a measurement of the acidity or alkalinity of the soil, and it is an important factor that affects plant growth.

Option 1: Increase the pH of the soil - This is the correct answer. Dolomite powder is a natural source of calcium and magnesium, which can help to neutralize acidic soil and increase its pH. This is beneficial because most plants prefer a slightly alkaline soil pH for optimal growth. By increasing the pH, dolomite powder can improve the availability of nutrients to plants and enhance their overall health and productivity.

Option 2: Lower the pH of the soil - This is incorrect. Dolomite powder is used to raise the pH of acidic soil, not lower it.

Option 3: Increase the phosphorus content of the soil - This is incorrect. Dolomite powder does not contain phosphorus, so it does not directly increase the phosphorus content of the soil.

Option 4: Increase the nitrogen content of the soil - This is incorrect. Dolomite powder does not contain nitrogen, so it does not directly increase the nitrogen content of the soil.

In conclusion, dolomite powder is applied in agricultural lands to increase the pH of the soil, providing