How To Apply Mycorrhizae To Established Plants

How To Apply Mycorrhizae To Established Plants

Can you apply mycorrhizae to established plants? Yes, you can apply mycorrhizae to established plants by adding the mycorrhizal inoculant close to the base of each small seedling, blending it into the soil, and watering thoroughly.

Liquid inoculant can also be used to water transplants and add mycorrhizal fungi around the plant’s drip line.

The most important factors are getting the mycorrhizae into the root zone and ensuring good soil moisture to allow the fungi to colonize the roots of the established plants. Applying at the drip line and watering in thoroughly are key.

Here are the key steps to apply mycorrhizal fungi to established plants:

Granular Mycorrhizae Application

• Cultivate and blend the granular mycorrhizae into the soil around the drip line of the plant
• Water the soil thoroughly to ensure the mycorrhizae makes direct contact with the plant’s roots
• Cover the soil with mulch afterwards, as mycorrhizae cannot survive when exposed to sunlight

Soluble Mycorrhizae Application

• Mix the soluble mycorrhizal product with non-chlorinated water according to the manufacturer’s instructions
• Use a soil drench to thoroughly wet the soil around the plant’s drip line
• The key is to ensure the mycorrhizal solution reaches the plant’s roots

Some additional tips:

• Applying mycorrhizae to established, stressed or struggling plants can help revive growth and vigor
• For turf, it’s most effective to apply mycorrhizae right after aerating the soil so more of the fungi can infiltrate down to the roots
• Avoid applying granular mycorrhizae on top of the soil, as sunlight will inhibit the fungi
• Use a tool to poke holes in the soil reaching down to the roots, then pour the granules into the holes to ensure direct root contact

Methods to Apply Mycorrhizae to Established Plants

Soil Drench Method

The soil drench method involves mixing mycorrhizal inoculant with water and applying it directly to the soil around the plant’s root zone. This method ensures that the fungal spores come into contact with the roots, facilitating colonization.

Soil Drench Application

1. Prepare a mycorrhizal solution by mixing the inoculant with water according to the product instructions.
2. Water the soil around the plant to ensure it is moist.
3. Pour the mycorrhizal solution evenly around the plant’s root zone.

Lightly water the area again to help the solution penetrate the soil

Root Injection Method

The root injection method uses a specialized tool to inject mycorrhizal inoculant directly into the root zone. This technique is particularly effective for deep-rooted plants and ensures precise delivery of the fungi to the root system.

Root Injection Technique

1. Fill a root injector tool with the mycorrhizal inoculant.
2. Insert the injector into the soil near the plant’s root zone.
3. Inject the inoculant into the soil at multiple points around the plant.
4. Water the area thoroughly to facilitate fungal colonization.

Mixing with Compost or Mulch

Incorporating mycorrhizal inoculant into compost or mulch before application is another effective method. As the compost or mulch breaks down, it releases the mycorrhizae into the soil, promoting gradual colonization.

Incorporating with Compost or Mulch

1. Mix the mycorrhizal inoculant thoroughly with compost or mulch.
2. Apply the compost or mulch evenly around the plant’s base.
3. Ensure the layer is not too thick to avoid smothering the roots.
4. Water the area to help release the mycorrhizae into the soil.

Benefits of Mycorrhizae for Established Plants

Enhanced Nutrient Uptake

One of the primary benefits of mycorrhizae is their ability to enhance nutrient uptake, especially phosphorus, which is often limited in soils. This improved nutrient acquisition supports robust plant growth and development.

Improved Soil Structure

Mycorrhizae contribute to better soil structure by promoting the formation of soil aggregates. These aggregates improve soil porosity, water retention, and root penetration, creating a more favorable environment for plant growth.

Increased Plant Resilience

Plants associated with mycorrhizae exhibit greater resilience to environmental stresses such as drought, salinity, and soil-borne diseases. This increased resilience helps established plants maintain health and productivity under challenging conditions.

Preparing to Apply Mycorrhizae

Selecting the Right Mycorrhizal Product

Choosing the appropriate mycorrhizal product is essential for effective application. Products vary in the types of mycorrhizae they contain, so select one that is compatible with your plant species. Look for high-quality inoculants that specify the presence of viable spores or mycelium.

Timing the Application

The best time to apply mycorrhizae to established plants is during the growing season when plants are actively absorbing nutrients. Early spring or late fall are ideal periods, as soil temperatures and moisture levels are conducive to fungal colonization.

Best Practices for Mycorrhizae Application

Avoiding Chemical Interference

Avoid using chemical fertilizers and pesticides near the time of mycorrhizal application, as these can inhibit fungal colonization. Opt for organic fertilizers and pest control methods to support the mycorrhizae.

Maintaining Soil Moisture

Mycorrhizae thrive in moist conditions, so it’s essential to keep the soil adequately watered. However, avoid overwatering, which can lead to waterlogged soil and root rot.

Using Organic Mulch

Applying organic mulch helps maintain soil moisture and provides a steady supply of organic matter, supporting mycorrhizal fungi. Materials like straw, wood chips, and leaf litter are excellent choices.

Monitoring and Maintaining Mycorrhizal Colonization

Observing Plant Health

Regularly monitor plant health to gauge the effectiveness of mycorrhizal application. Improved growth, increased vigor, and better resistance to stress are indicators of successful colonization.

Soil Testing and Adjustments

Conduct soil tests periodically to assess nutrient levels and microbial activity. Based on the results, adjust your soil management practices to maintain a favorable environment for mycorrhizae.

Long-Term Maintenance Strategies

To sustain mycorrhizal colonization, continue using organic soil amendments, avoid soil disturbance, and practice crop rotation. These strategies help maintain a healthy soil ecosystem and support ongoing fungal activity.

FAQs about Applying Mycorrhizae to Established Plants

Can I apply mycorrhizae to any type of plant?

Mycorrhizae can be applied to most plants, but some, like members of the Brassicaceae family, do not form mycorrhizal associations.

How often should I apply mycorrhizae to established plants?

Typically, one application during the growing season is sufficient. However, in poor soils, additional applications may be beneficial.

Can I mix mycorrhizae with fertilizers?

It’s best to avoid mixing mycorrhizae with chemical fertilizers. Organic fertilizers are more compatible and support fungal colonization.

What are the signs of successful mycorrhizal colonization?

Signs include improved plant growth, increased nutrient uptake, and greater resistance to stress.

How long does it take for mycorrhizae to colonize plant roots?

Colonization can take several weeks to a few months, depending on soil conditions and plant type.

Can I use mycorrhizae in containers and pots?

Yes, mycorrhizae can be applied to container plants using similar methods as for garden plants.