Gusmer Wine Catalog 2023-24

View Table of Contents

Micro Essentials TM Nutrient Addition Chart for Powder Yeast Assimilable Nitrogen (YAN)

Fermentation Conditions (Select those that apply) • High density grapes/musts ( ≥ 25 Brix) • Water and/or heat stress • Water additions to juice/must • Excessive clarification • History of problem ferments • History of H 2 S formation • Vine stress

YAN is the sum of all nitrogen sources (organic and inorganic) usable by yeasts. YAN represents ammonia nitrogen and alpha-amino nitrogen measured in juices or musts.  Simplify crush — contact Gusmer Analytical Services for YAN analyses. See page 49 How to Determine Required Micro Essentials TM Powder Addition Using the Graph Below 1) Measure the YAN level in juice. 2) Determine the fermentation conditions from the list above. If none of the conditions listed above are present, regard the fermentation as Easy ( blue ), one or two of the conditions Difficult ( green ), and more than two conditions Challenging ( purple ). 3)  Find the measured YAN level on the Y axis, and move across the graph horizontally to the color indicating your fermentation condition. Move straight down for the product recommendation and dosage. Example: If you have a YAN of 190 and Difficult ( green ) conditions, you should add 2 lbs Micro Essentials Prime, 2 lbs Micro Essentials Powder, and 1 lb diammonium phosphate per 1,000 gal.

866.213.1131 | 19

Powered by