# 075: The Importance of Mycorrhizal Fungi for Vineyard Health with Dr. R. Paul Schreiner

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Text version: https://stenobird.com/podcast/vineyard-underground-6280933/075-the-importance-of-mycorrhizal-fungi-for-vineyard-health-with-dr-r-paul-schreiner.md
Podcast: [Vineyard Underground](https://stenobird.com/podcast/vineyard-underground-6280933)
Published: 2025-07-08T08:00:00+00:00
Episode link: https://f364ccd0-b8ab-4504-aea4-3e21b899bc22.libsyn.com/075-the-importance-of-mycorrhizal-fungi-for-vineyard-health-with-dr-r-paul-schreiner
Audio file: https://traffic.libsyn.com/secure/f364ccd0-b8ab-4504-aea4-3e21b899bc22/VU_Ep075_Master.mp3?dest-id=3650511
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Duration seconds: 3580

## Resource

In this episode of Vineyard Underground, Fritz welcomes Dr. R. Paul Schreiner, recently retired research plant physiologist from the USDA, for a deep dive into the fascinating world of mycorrhizal fungi and their impact on vineyard health. With over two decades of research experience in grapevine physiology and root biology, Dr. Schreiner shares the critical roles these fungi play in nutrient uptake, root efficiency, drought tolerance, and overall soil structure. Fritz and Dr. Schreiner explore what arbuscular mycorrhizal fungi (AMF) are, how they form symbiotic relationships with grapevine roots, and why grapes are considered "super hosts." They discuss how AMF enhances phosphorus acquisition, especially in low-P soils, and how they support the uptake of other nutrients like potassium, zinc, and copper. They also talk about factors that suppress or encourage fungal colonization, such as excessive fertilization, cultivation, cover cropping, and herbicide use. Dr. Schreiner also previews ongoing research from the High-Resolution Vineyard Nutrition Project , which is helping redefine best practices for tissue sampling and nutrient timing. Whether you're planting a new vineyard or managing an established one, this episode offers an essential look at how understanding underground biology can elevate your vineyard management decisions. In this episode, you will hear: How grapevines form symbiotic relationships with mycorrhizal fungi Why phosphorus is the most important nutrient supported by AMF The effects of nitrogen and phosphorus fertilization on fungal colonization Whether commercial AMF inoculants are worth the investment Practices that promote healthy fungal populations in vineyard soil Follow and Review: If you enjoyed this episode, be sure to follow the podcast and…

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