How do biosolids and manure contribute to nutrient supply?

Biosolids and manure play a crucial role in nutrient supply for soils primarily by providing a diverse array of nutrients, including secondary and micronutrient elements. While macronutrients such as nitrogen, phosphorus, and potassium are vital for plant growth and are abundant in these organic materials, they are not the only nutritional benefits they offer.

Secondary nutrients like calcium, magnesium, and sulfur are also present in biosolids and manure, contributing to plant health and soil fertility. Additionally, micronutrients, which are essential in smaller quantities, such as iron, manganese, zinc, and copper, are important for various physiological processes in plants. Their presence ensures a comprehensive nutrient profile that supports not just basic growth but also overall plant vitality and crop yield.

In contrast, while biosolids and manure can contribute to soil texture and improve water retention, their most significant contribution lies in the variety of nutrients they provide. The idea that they solely improve water retention neglects the broader aspect of nutrient enhancement, demonstrating that these organic materials are multifaceted in their contributions to agricultural soil health.