Have you ever planted your garden and even though you’ve had plenty of sunny weather it just doesn’t seem to be growing the way it should? You might need to test your soil to see if you need to replenish some nutrients.
The University of Alaska Fairbanks Cooperative Extension Service has several publications and a video that can help you decide if you need to test your soil, and if yes, teach you how. Many gardeners test their soil at the end of the season, so they can amend their soil as needed to prepare for the next spring’s planting. But sometimes you might need to test during the growing season, which is what Sitka Local Foods Network Garden Mentor Program Coordinator Michelle Putz did last year when one of her student’s gardens wasn’t doing very well.
“Soil testing is not always necessary,” Michelle said. “If you have several hours of direct sun and your garden is growing beautifully, then you may not need to test your soil. If you have sun but your garden is not doing so well, or if you have brand new soil, it might be worth testing the soil.
“One of our Garden Mentor families in 2015 grew beautiful but tiny plants that were struggling to get bigger, she added. “A simple soil test showed that their soil was low in nitrogen and needed a little acid. Once we added coffee grounds (for acid) and blood meal (for nitrogen), the plants grew substantially. Had we realized that our starting soil was so basic (not acidic enough) and nutrient poor, we could have made adjustments before the growing season and had a much more productive garden.”
In Southeast Alaska, our rain tends to wash a lot of the nutrients out of the soil. This is why it’s almost a requirement for gardeners to amend their soil with seaweed, compost, coffee grounds and other items to replenish the missing nutrients. It also helps to rotate your crops from one garden plot to the next, since different plants draw different nutrients as they grow (for example, potatoes use a lot of nitrogen while tomatoes use a lot of potassium).
To learn more about soil-testing, watch the video at the top of this story and read the three attached files below. The attached files and video will show you how to take a soil sample and how to send it to a lab for testing.
• Soil and Fertilizer Management for Healthy Gardens (UAF Cooperative Extension Service publication, HGA-0338)
• Factors to Consider in Selecting a Soil-Testing Laboratory (UAF Cooperative Extension Service publication, FGV-00045)
• Soil Sampling (UAF Cooperative Extension Service publication, FGV-00044)
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