When soil pH drops below 6.5, manganese can reach a toxicity level for some sensitive plants. The soil test takes the guesswork out of fertilization and is extremely cost effective. It not only eliminates the waste of money spent on unnecessary fertilizers, but also eliminates over-usage of fertilizers, hence helping to protect the environment. Soil samples can be taken in the spring or fall for established sites. For new sites, soil samples can be taken anytime when the soil is workable.
Most people conduct their soil tests in the spring.
However, fall is a preferred time to take soil tests if one wants to avoid the spring rush and suspects a soil pH problem. Fall soil testing will allow you ample time to apply lime to raise the soil pH. Sulfur should be applied in the spring if the soil pH needs to be lowered. A soil test every two to three years is usually adequate. Sample more frequently if you desire a closer monitoring of the fertility levels, or if you grow plants that are known to be heavy feeders. A soil sample is best taken with a soil probe or an auger.