How does soil pH influence nutrient uptake in trees?

• A. Extreme pH levels reduce the availability of certain nutrients; near-neutral pH generally supports better uptake of many nutrients
• B. pH has no effect on nutrient uptake
• C. High pH increases the availability of all micronutrients
• D. Low pH increases all nutrient uptake equally

Answer: (A)

Soil pH controls how nutrients dissolve in soil water and how easily tree roots can absorb them. When pH is extremely acidic or extremely alkaline, the chemical forms of many nutrients become less soluble or bind to soil particles in ways that make them unavailable to roots, so uptake drops even if the total amount in the soil is decent. When pH sits closer to neutral, a larger share of essential nutrients stays in soluble forms that roots can take up more readily, supporting better overall nutrient uptake. This is why a soil pH that's too far from a tree’s preferred range often leads to nutrient deficiencies or imbalances even though nutrients are present. In practice, adjusting pH toward the tree’s optimal range—raising pH with lime in acidic soils or lowering it with sulfur in alkaline soils—helps improve nutrient availability and uptake.