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In this graph, the green bars are the soil health scores of the sites that were sampled in the spring, and the orange bars are sites that were sampled in the fall. The height of the bar shows the site’s soil health score. Our spring soil samplers had a significantly lower median score than our fall samplers.
This is why it is important to test your soil health at the same time each year. If you test soil in the spring, then apply a soil amendment and test again in the fall, you won't be able to really tell if the amendment affected your soil’s health. Any increase in the soil health score may just be due to this seasonal variation we see here. You must test your soil at the same time each year to really be able to assess changes in soil health.
Elizabeth Black is the producer of the Citizen Science Soil Health Project