What condition is most likely to lead to aluminum toxicity in plants?

Aluminum toxicity in plants is most commonly associated with low soil pH. When the pH of the soil drops below a critical level, typically around 5.5 or lower, the availability of aluminum increases significantly. In acidic conditions, aluminum ions become more soluble and can easily be taken up by plant roots. This increased aluminum availability is harmful to plants, as it can lead to root damage, inhibit root growth, and affect the overall nutrient uptake, which can ultimately reduce plant health and yields.

Understanding the relationship between soil pH and aluminum availability is crucial for effective soil management and crop production. Proper soil testing and pH management through liming can help mitigate the risk of aluminum toxicity, ensuring a healthier growing environment for crops.