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I bought a Burpee Soil Test Kit at Lowe's today for $3.97. I've had my soil tested several times in the past by our University Extension office, but it's been about 4 years since I had that done. My test results came back fine last time, and they were much more detailed of course, but the University doesn't test for nitrogen. Since I think my garden soil is OK but it's been awhile since I had it tested, I thought I'd try this basic kit.
For the money, I've got to say I think the kit is very useful. There are four tests included, pH (soil acidity), Nitrogen, Phosphorus, and Potassium (potash). Best I can tell by matching colors with the chart included, my vegetable garden soil results are:
pH: Neutral, maybe just a bit on the alkaline side.
Nitrogen: Low to Medium
This matches what I'd expect. My pH has always tested about 6.8 with the University, but that could have easily changed to 7.1 or so. I'm always adding a lot of organics (sawdust from my shop lately, shredded leaves last fall), so it may have cost some nitrogen to break those down. I'll add some high-nitrogen fertilizer or manure. I'm a big believer in high-phosphorus fertilizers, and since I've been using those for years I'm not surprised the phosphorus tests high - good. Same thing with potassium, it looks like it's fine.
It's good to have this kind of approximate pH and macronutrient verification from a basic test kit, and for the price I think this one's a good deal.