How do salty soils reduce fruit tree yields?

Salty soils significantly reduce fruit tree yields through several physiological and physical mechanisms:

• Osmotic Stress: Plants typically absorb water through their roots via osmosis. When salt concentrations in the soil are high, the energy required to extract water increases. If the soil salinity is high enough, water can flow in the opposite direction—from the plant roots into the soil—causing dehydration and limiting the tree's ability to take up water and nutrients.123
• Toxicity: In some instances, dissolved salts can be directly toxic to the tree when absorbed by the root system.2
• Physical Soil Degradation: High levels of sodium can lead to the formation of "sodic soils." Sodium ions replace calcium on clay particles, causing the soil to become nearly impervious to water and root penetration. This results in shallow, weak root systems that cannot efficiently access necessary resources.23
• Foliar Symptoms: In arid and semi-arid regions, the accumulation of salts in subsurface layers often manifests as abnormal foliar symptoms, which directly correlate to reduced productivity and lower fruit yields.3