Bluelab Soil pH MeterThe pH level of soils, substrates or media strongly influences crop performance. Do you know what the pH of your soil is? pH Soil testing made simple! Most soils have a natural buffer for nutrients and pH, but when it goes wrong, it goes really wrong and fast. Yellow leaves, stunted growth, slow growth, are all signs that the plant is not getting the nutrients they need from the soil. This is often caused by lock up . This is a situation where the