Grapes Research

Managing Magnesium

Diagnosing and correcting magnesium deficiency in vineyards. One of the important characteristics of vineyard soils when it comes to supplying nutrients is its “cation exchange capacity,” or its ability to supply the nutrients that come in cation form (cation=ion with a positive electrical charge). In the realm of plant nutrition, cations are usually potassium, magnesium, and calcium. Of the three, magnesium is required in the smallest amount in the vine, but that small amount serves some very important functions. Like most of the other essential nutrients, magnesium has a few different roles, according to Hans Walter-Peterson of Cornell University’s...