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1 Department of Viticulture and Enology, University of California, Davis.
The ammonia content of grapes was discussed along with possible paths of assimilation. Variations due to years were found associated with climate changes. Varieties, rootstocks, and areas caused distinct variations in ammonia content. The changes were less pronounced it ratio of ammonia to total nitrogen was considered. The effect of maturity was especially pronounced in fruit from the warmest areas.
Grape juice ammonia values in 310 determinations ranged from 24 to 309 mg/l (average 123 mg/l). The ratio of ammonia to total nitrogen can be fairly constant between varieties and regions.
Accepted on December 10, 1969
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