Test your soil

If you are one of the thousands of homeowners planning a vegetable garden, now’s the time to get your soil tested.  Why, you might ask?  Well, the soil you intend to hold and nurture your vegetables – their life-blood – may not have the optimal or near-optimal pH or nutrients for vegetable growth.  Spending $8 to learn this now could save you mounds of frustration – think unhealthy, stunted, yellowing plants.  Soil tests sent to the UConn soil lab identify pH, which affects the availability of the soil’s nutrients, the levels of essential nutrients, and how much vital organic matter your soil holds.  It also helps direct how you spend that green stuff we all work so hard to amass, by guiding the purchase of only the nutrients your soil needs.  This, in turn, helps prevent excessive or poorly-timed fertilizing – both a waste of money and contributory to ground and surface water pollution that factors in algae blooms and water-life problems in lakes and Long Island Sound.


The soil lab website reports each $8 test gets you this:

Samples submitted for the Standard Nutrient Analysis are analyzed for plant available calcium, magnesium, phosphorus, potassium, iron, manganese, copper, zinc, aluminum and boron. The soil pH is determined and samples are screened for estimated total lead. Soil test results also include an estimation of the soil textural class and amount of soil organic matter. Limestone and fertilizer recommendations are made based on test results and the crop being grown. (Soils sent in the pre-paid soil test collection kits receive this test.) The standard nutrient analysis is appropriate for lawns, vegetables, flowers, woody ornamentals, fruits, agronomic crops and nursery crops (like Christmas trees) grown in mineral soil.


Worth it?  In a word, yes.  A test of a newly dug area in my yard – set aside for vegetable growing – revealed too high phosphorus and potassium levels, high calcium and magnesium levels, and a pH of 7.6.  Had I blindly assumed this freshly dug area had a low pH, as many soils do in my area, I might have added limestone and further raised the pH above already high levels.  I also might have added an organic NPK fertilizer when the soil really needed the nitrogen from composted manure.  Soils collected from other parts of my yard had revealed very different results – one section had a pH of 4.6 and very low calcium, magnesium, phosphorus, and potassium; a lawn area had pH of 4.1, low calcium and magnesium, medium phosphorus, and very high potassium; a third section, next to the house foundation , had pH of 6.7, very high calcium and phosphorus, medium high magnesium, and medium potassium levels; while an area planned for bulbs had a pH of 4.6, but very low levels of the four nutrients.  Obviously, each of these areas needed very different amendments.


The soil lab provides detailed sampling, labeling, and mailing instructions – basically you dig up a few random plugs of soil from specific planned planting areas, mix the samples in a clean bag or container, and scoop a cup of this mixture into a sealable plastic bag.  You’ll need to collect one sample mix from the vegetable area, and others from lawn and flower bed areas, and identify and mail them separately.  Prepaid soil sample mailers can be purchased at UConn’s soil lab or Home and Garden Education Center, at some cooperative extension offices, and some garden centers may also have them.  So rather than blindly guess what your soil needs, do your soil, your future plantings, and yourself a favor … invest eight bucks and be led by facts.




Filed under Gardening, General, Soil

2 responses to “Test your soil

  1. Joene,

    Great post on an often overlooked aspect of gardening. Too often we assume we know what’s in our soil when we really have no idea. I also think many plants do not thrive because of soil conditions but gardeners are more likely to blame it on something else – like inadequate amounts of water or sun.

  2. joenesgarden

    Soil is the foundation that holds, supports, and feeds plants. Like the foundation of a house, soil must have the right ingredients to properly support plant growth. Testing is an easy thing to overlook … it’s time for me to take my own advice and retest my vegetable garden soil, which I hope to do in the next few days.

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