No, they are unreliable. I do hundreds of soil test interpretations a year and will not touch one done with a home test. Google UMASS Amherst Soil Test. The $13 test is quick, reliable and detailed. You can mail it in and results are almost always less than two weeks, even in busy season (right now).

A soil test done by Michigan State University through the Cooperative Extension Service office is $13.00 per sample, others are less, some more. With that soil test you get information about what is going on in your soil and how to correct any deficiencies. A good, reliable soil test cn help save you money by showing you that you may not need to apply certain materials, or maybe not in the amount someone tells you, one reason why many farmers rely on them to guide what they apply to their fields. in addition to that soil test these simple soil tests can also help. 1) Structure. From that soil sample put enough of the rest to make a 4 inch level in a clear 1 quart jar, with a tight fitting lid. Fill that jar with water and replace the lid, tightly. Shake the jar vigorously and then let it stand for 24 hours. Your soil will settle out according to soil particle size and weight. A good loam will have about 1-3/4 inch (about 45%) of sand on the bottom. about 1 inch (about 25%) of silt next, about 1 inch (25%) of clay above that, and about 1/4 inch (about 5%) of organic matter on the top. 2) Drainage. Dig a hole 1 foot square and 1 foot deep and fill that with water. After that water drains away refill the hole with more water and time how long it takes that to drain away. Anything less than 2 hours and your soil drains� too quickly and needs more organic matter to slow that drainage down. Anything over 6 hours and the soil drains too slowly and needs lots of organic matter to speed it up. 3) Tilth. Take a handful of your slightly damp soil and squeeze it tightly. When the pressure is released the soil should hold together in that clump, but when poked with a finger that clump should fall apart. 4) Smell. What does your soil smell like? A pleasant, rich earthy odor? Putrid, offensive, repugnant odor? The more organic matter in your soil the more active the soil bacteria will be and the nicer your soil will smell. 5) Life. How many earthworms per shovel full were there? 5 or more indicates a pretty healthy soil. Fewer than 5, according to the Natural Resources Conservation Service, indicates a soil that is not healthy. Check with your states Agricultural School, the one with the Cooperative Extension Service offices, to find out about having that good, reliable soil test done.

Already use Dr Goodearth! In fact I just sent out my 3 micronutrient tests out this evening! :) I love their easy to understand reports but they are more expensive than the other places (universities) I guess. I've tried their basic tests but I like a little more detail on the micro's too. So easy to use, can purchase the kits right online, collect your samples and dry them while you are waiting for the kit to come. BTW, I ordered the tests online on Friday and had them in hand today! Pack your samples in the convenient bags then into the boxes, and drop in the mail, postage already paid.

Not sure but most state/county extension services will test your soil with much more precise methods for about the same price as the kits.