What method can be used by farmers to reduce soil salinity?

Leaching with excess irrigation water is an effective method to reduce soil salinity. This approach involves applying large amounts of water, which can help dissolve and wash away soluble salts that have accumulated in the soil profile. When excess irrigation water is applied, it percolates through the soil layers, carrying away salts and preventing their concentration, which can adversely affect crop growth and soil health.

In contrast, adding organic matter can improve soil structure and water retention but does not directly address existing salinity issues. Applying fertilizers might actually exacerbate the problem in certain conditions by introducing more salts into the soil. Implementing crop rotation can enhance soil health and diversity of crops but does not directly influence the salinity levels in the soil like leaching does. Thus, utilizing leaching as a method provides a direct approach to managing and mitigating soil salinity effectively.