Soil Fertility

The formula to extract the required nitrogen involves multiplying by 2.17 when calculating urea content. This factor accounts for the nitrogen percentage in urea fertilizer, which is approximately 46%. Hence, required nitrogen × 2.17 gives the amount of urea needed.

The electrical conductivity of saline soil is typically greater than 4 ds/m. Soils with electrical conductivity higher than this are considered saline. Salinity in soil is caused by the presence of soluble salts, which affect the soil's structure and fertility.

The electrical conductivity of saline soil is typically greater than 4 ds/m. Soils with electrical conductivity higher than this are considered saline. Salinity in soil is caused by the presence of soluble salts, which affect the soil's structure and fertility.

To reclaim sodic soils, various soil amendments such as Gypsum, Pyrite, and Lime sulphur are used. These amendments help in displacing sodium from the soil and replacing it with calcium, which improves soil structure and fertility.