Which element's analysis often indicates potential toxicity for plants?

Boron is an essential micronutrient for plants, but its narrow range between deficiency and toxicity makes it particularly noteworthy in analysis. When boron levels exceed the necessary threshold, it can become toxic to plants, leading to adverse effects such as stunted growth, leaf necrosis, and reproductive issues. This characteristic is crucial for agronomists and crop advisors, as they need to monitor boron levels carefully in soil and tissue samples to ensure optimal plant health.

While iron, magnesium, and calcium are also important for plant growth, they do not typically exhibit the same immediate toxicity concerns associated with excess levels in the same manner as boron. Iron can lead to toxicity under specific conditions, but it is less commonly seen than boron toxicity. Similarly, while magnesium and calcium are vital for various physiological functions in plants, they tend to have wider tolerable ranges before reaching toxic levels. Therefore, monitoring for boron is crucial to avoid potential plant health issues in agricultural practices.