Question: Are those over-the-counter soil tests any good?
Answer: While using an over-the-counter soil test is much better than doing no soil test at all, it’s typically much more accurate and as cost-effective to send your soils to a soil testing lab.
Many state universities have soil testing labs. There are also private soil testing labs like Soil Control Labs in Watsonville, CA. These labs will walk you through the best way to collect a soil sample and offer a range of analyses including how acid your soil is and what fertilizers it may need.
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