4 Common Soil Problems (And How To Easily Fix Them)

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The key to a healthy soil with balanced nutrients may be easier and more complicated than you thought.

It’s not just about spraying the right fertilizer and watching it be miraculously sucked into your plants in the exact quantities they need. That’s because plants work in harmony with specific types of soil structures, microbe populations, and pH balances, so the best thing you can do for your plants is learn about creating a healthy soil through mimicking natural processes in natural soil ecosystems and begin to think of your soil as just that: an ecosystem.

Treatment of Nutrient Deficiencies

There are three main ways of treating soil nutrient deficiencies: increasing bioavailability/absorption of existing nutrients, adding non-harmful nutrient sources, and creating an efficient nutrient cycle.

Nutrient absorption can be increased through creating a healthy soil food web by using composts, compost tea, chop and drop techniques, effective microorganisms, green manure and cover crops, and lots of mulch. With the healthy soil food, web microbes will predigest nutrients for plants, while helping to bind them in the soil within their bodies and within the rich, well-structured soil they help to create.

Efficient nutrient cycles are created through having a diversity of plants with different root depths and patterns, especially perennials (and including trees). This ensures nutrients are pulled from deeper in the soil, while creating less root competition. Protecting your soil from erosion and nutrient leaching through mulch (4-6 inches) and/or cover crops is essential.

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It’s also important to test your soil, both nutrients and pH, ideally at a soil testing lab. You’ll most likely have to mail in samples following their collection instructions. This will then give you a picture of how to proceed.

Treatment of Nutrient Oversupply

It can be easy to over-fertilize with concentrated chemical fertilizers like ammonium sulfate or sulfur coated urea, for example. These fertilizers are damaging to soil ecosystems. Many fertilizers are directly toxic to soil organisms, particularly in high amounts, reacting with other elements in the soil to create toxic substances such as sulfuric acid, hydrogen sulfide, and chlorine. Hydrogen ions released from some processes disrupt the soil’s nutrient-holding capacity, while chemical fertilizers also may increase mineral salts in the soil, stealing water from the plants.

It’s always best to go the slow-and-steady route to building your soil, using natural compounds that a healthy soil food web can break down and make available to the plants as they need them, rather than trying to force feed your plants, disrupting their ability to get what they need by themselves, and creating more work for you.

The best way to treat oversupply is to stop fertilizing with fertilizers high in the nutrient in question, and rebalance the soil if the nutrient oversupply may have caused deficiencies in other nutrients.

Following are four common soil nutrients, along with how plants react if there is an undersupply (deficiency) or oversupply.

1. Nitrogen deficiency/oversupply

Deficiency: Leaves turn pale green or yellow before finally dying, starting in older leaves, and overall plant growth slows.

Fertilizers: Seaweed, compost, compost teas, bone meal, and fertilizers containing natural sources of nitrates, ammonium or urea. Nitrogen “fixing” plants can help, since they have a symbiotic relationship with certain bacteria that pull, or fix nitrogen from the atmosphere. Plant things like peas, beans, honey locust and alder tree with your other plants.

Oversupply: Excess foliage growth, lack of flowering and fruiting, stunted root growth, browning of leaves, a buildup of mineral salts in the soil.

2. Potassium deficiency/oversupply

Deficiency: Leaf tips curl, leaves turn yellow between the veins before browning and dying, root growth slows, and plants have poor seed and fruit quality and quantity. Leaves may also develop brown or purple spots on underside.

Fertilizers: Compost and compost teas, langbeinite, potassium sulfate, sylvinite, seaweed, greensand, rock minerals and wood ash.

Oversupply: Calcium deficiency, low oxygen levels in soil, production of toxic compounds, loss of soil structure leading to compaction and poor water infiltration.

3. Phosphorous deficiency/oversupply

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Deficiency: Poor leaf, shoot and root growth; deep green, purple or red leaf color; delay in the maturity, including with fruit and seeds; poor nitrogen fixation in nitrogen-fixing plants.

Fertilizers: Compost and compost tea, mulch such as wood chips or straw, chicken manure, bone meal, rock phosphates (with no phosphoric acid added) and fish bone meal.

Oversupply: Yellowing of the leaves (especially just beyond veins), brown spotting, death of leaves, inhibition of beneficial fungi growth, decreased uptake of iron and manganese.

4. Sulfur deficiency/oversupply

Deficiency: Common in weathered soils and areas with heavy rainfall. Yellowing of leaves (especially younger leaves), dying leaf tips, stunted growth, high seedling mortality, few flowers. Similar to nitrogen deficiency, but with reddening of veins in young leaves.

Fertilizers: Compost and compost tea, langbeinite (as long as you need all of the nutrients contained), potassium sulphate (also includes potassium), gypsum and Epsom salt.

Oversupply: Rare, but causes acidity and deficiencies in selenium.

To recap: The most effective, low-labor and low-cost way to prevent and treat nutrient deficiencies and oversupply is to start conceptualizing your gardens or landscape as an ecosystem, and to begin treating it as such.

Just as a forest has a constant layer of mulch, so, too, should your plants. Just as an oak savanna has healthy and diverse soil ecosystems supported by multiple species of plant roots at varying depths, so, too, should your landscape. We indeed can mimic natural ecosystems while still achieving our own aesthetic, using the plants we prefer while giving them what they need to (largely) take care of themselves.

What advice would you add on taking care of nutrient deficiencies in the garden? Share your tips in the section below:

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