PT  - JOURNAL ARTICLE
AU  - C. S. Ough
TI  - Ammonia Content of California Grapes
AID  - 10.5344/ajev.1969.20.4.213
DP  - 1969 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 213--220
VI  - 20
IP  - 4
4099  - http://www.ajevonline.org/content/20/4/213.short
4100  - http://www.ajevonline.org/content/20/4/213.full
SO  - Am J Enol Vitic.1969 Jan 01; 20
AB  - 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.