Which micronutrient type is known for being more effective due to higher water solubility?

The correct answer is that sulphates are known for being more effective micronutrients due to their higher water solubility. When micronutrients are delivered to plants in a form that dissolves readily in water, they can be more easily absorbed by roots. Sulphate forms of micronutrients, such as zinc sulphate or copper sulphate, are particularly advantageous because their solubility enhances their availability to plants in the soil solution. This means that when they are applied, they can be readily taken up, allowing for more effective nutrition.

Additionally, sulphates remain stable in the soil and are usually less prone to leaching than some other forms, which supports consistent nutrient supply. This elevated solubility indicates that these micronutrients can quickly reach plant roots and facilitate various physiological processes necessary for optimal growth and development.

In comparison, oxides are generally less soluble in water, which makes them less effective as an immediate source of nutrients for plants. Oxy-sulphates and chelates can vary in solubility and effectiveness based on their specific chemical composition and the conditions of the soil in which they are applied. However, in general, sulphates stand out as the most effective micronutrient type due to their higher solubility.