What is the optimal pH range for most crops in Ontario?

The optimal pH range for most crops in Ontario is between 6.0 and 7.0. This range is considered ideal because it provides an environment where essential nutrients are most available to plants. Soil pH affects the solubility of nutrients and the overall health of the soil microbiome, which is crucial for nutrient cycling. In this pH range, macronutrients such as nitrogen, phosphorus, and potassium, as well as micronutrients like iron and manganese, are generally accessible for plant uptake, supporting robust growth and yield.

Soils with a pH below 6.0 may lead to nutrient deficiencies and toxicities, as certain elements become less available or overly soluble, while those above 7.0 can result in lower nutrient availability due to the fixation of nutrients in less soluble forms. A balanced pH within the 6.0 to 7.0 range therefore ensures that crops can effectively utilize nutrients, leading to better productivity and health.