Soil testing

We have never tested the soil here ever since we moved in. I think that it is fair to say that our success with growing vegetables has been “variable”. Some, although not all of it, maybe due to the quality of the soil. It is time to do some tests!!

Jo found a kit online that contains enough chemicals for up to 40 individual tests. Given that we are growing vegetables in a number of different locations on the property, it makes sense to do a number of tests in different locations.

The tests are easy to do once you get the hang of it. There are four separate tests: PH, Phosporous (P), Potassium (K), and Nitrogen (N).

For the PKN tests, the results all follow the same categorisation:

4 = Surplus

3 = Sufficient

2 = Adequate

1 = Deficient

0 = Depleted

So we tested four different locations where we are growing vegetables. The results are shown below

TestLeft Veg PatchRight Veg patchPolytunnelGreenhouse
PH5.05.255.56.5
PP3P3P3P3
KK2K0K0K0
NN0N0N0N0

With the exception of the greenhouse, all of the soil is a little bit acidic and can do with being raised. Ideally, the PH should be between 6 and 7. All of the samples, including the veg patch where we have been growing peas and beans, is indicating that it is low in Nitrogen.

I am not sure how accurate these test kits are. Having read the reviews for various test kits on Amazon, the feedback on these kits seems to be “mixed”.

This particular kit seems to be available under a number of different brands, but it is the same kit inside. They all retail for around £25. How accurate are they? Mmmm. Not sure.
Using the test kit on the samples from the vegetable patches
This bed had broad beans and peas in it until very recently. This is the left hand bed in the vegetable patch.