Episode
094: Vineyard Nutrition Essentials - Magnesium Fundamentals with Dr. Jaclyn Fiola
- Podcast
- Vineyard Underground
- Published
- Mar 31, 2026
- Duration seconds
- 2735
- Processing state
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Summary
In this final installment of the Vineyard Nutrition Essentials series, Fritz is joined by Dr. Jaclyn Fiola, Assistant Professor of Soil and Environmental Science at Delaware Valley University, to unpack the critical role magnesium plays in vineyard health and productivity. Building on prior discussions around potassium, the conversation explores how magnesium functions as a key macronutrient, particularly as the central component of chlorophyll and a driver of photosynthesis and energy transfer in grapevines. Dr. Fiola explains that magnesium primarily originates from soil minerals, especially in darker, magnesium-rich parent materials, and that soil characteristics such as pH, texture, moisture, and cation exchange capacity influence its availability. There is a delicate balance between magnesium, potassium, and calcium, and nutrient competition can lead to deficiencies even when soil levels appear adequate. Listeners will learn how to identify magnesium deficiency symptoms, including interveinal chlorosis in older leaves, and why these symptoms typically emerge later in the growing season. The episode also underscores the importance of accurate diagnosis through soil and tissue testing to avoid mismanagement. Listen now to learn the important role of magnesium in your vineyard. In this episode, you will hear: Magnesium as a core component of chlorophyll and photosynthesis Soil pH, texture, and moisture driving nutrient availability Competition between magnesium, potassium, and calcium Late-season deficiency symptoms and how to recognize them Importance of tissue testing for accurate diagnosis Pre-plant and in-season magnesium correction strategies Follow and Review: If you enjoyed this episode, be sure to follow the podcast and leave a 5-star review on Apple Podcasts…