Is mushroom compost high in phosphate?

Mushroom compost typically contains moderate levels of phosphate, as it is made from the substrate used to grow mushrooms, which often includes materials like straw and manure. While it provides some nutrients, including phosphorus, its phosphate content is generally lower than that of other organic fertilizers specifically formulated for high phosphorus levels. The nutrient content can vary depending on the specific ingredients used and the mushroom cultivation process. Therefore, it's advisable to conduct a soil test if precise nutrient levels are needed for specific plants.