University of California

Field testing of grape maturity


M. A. Amerine
E. B. Roessler

Authors Affiliations

M. A. Amerine was Professor of Enology and Enologist in the Experiment Station, Davis; E. B. Roessler was Professor of Mathematics and Statistician in the Experiment Station, Davis.

Publication Information

Hilgardia 28(4):93-114. DOI:10.3733/hilg.v28n04p093. November 1958.

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Since harvesting grapes at the proper stage of maturity is essential to quality—whether the grapes are intended for winery, table, or raisin use—an accurate means of estimating maturity in the field is necessary. Experiments were designed to measure the reliability of three field sampling methods—individual berry, cluster, and whole vine—in order to provide a more rational basis for grower practice. The varieties tested were Semillion and Carignane in regions II, IV, and V, Thompson Seedless in regions IV and V, and Flame Tokay in region IV. The degree Balling, Abbé refractometer reading, per cent reducing sugar, per cent total acidity, and pH were determined on all samples. According to these analyses, the three methods compare very favorably. It is suggested, however; that berry sampling, since it is the simplest and most rapid of the three methods, may be the most practical.

Literature Cited

Amerine M. A. Laboratory procedures for enology. 1955. Davis: Department of Viticulture and Enology. University of California. 108p. p. (mimeo.)

Amerine M. A. The maturation of wine grapes. Wines and Vines. 1956. 37:27-30. 32, 34-36, 53-55.

André Charles, Lemineur Michel, Orizet Rivoire, Vedel . Contribution à l’étude de la maturation du raisin. Prog. Agr. et Vitic. 1951. 136:99-103. 114-128, 141-152.

Benvegnin L., Capt E. L’échantillonnage à la vigne pour l’évaluation de la maturité du raisin sur cep. Rev. Romande d’Agric., de Vitic. et d’Arbor. 1955. 11:13-14.

Berg H. W., Marsh G. L. Sampling deliveries of grapes on a representative basis. Food Tech. 1954. 8:104-108.

Fisher R. A. Statistical methods for research workers. 1950. 11th ed. New York: Hafner Co. 354p. DOI: 10.2307/2981200 [CrossRef]

Flanzy M. Charactéristiques des raisin. Raisins à vins, raisins de table et raisins à jus de fruits. Ann. Nutrition et Aliment. 1955. 9:A113-A141.

Huglin P. Étude sur la morphologie, la phénologie et la productivité des principaux cépages de V. vinifera L. cultivés an Alsace. Annales Amélior. Plantes. 1955. 5:5-51.

Jacob H. E. Relation of the maturity of the grapes to the yield, composition and quality of raisins. Hilgardia. 1942. 14:321-345. DOI: 10.3733/hilg.v14n06p321 [CrossRef]

La Rosa W. V., Nielsen U. Effect of delay in harvesting on the composition of grapes. Amer. Jour. Enol. 1956. 7:105-111.

Winkler A. J. Maturity tests for table grapes. California Agr. Exp. Sta. Bull. 1932. 529:35 http://archive.org/details/maturitytestsfor529wink

Amerine M, Roessler E. 1958. Field testing of grape maturity. Hilgardia 28(4):93-114. DOI:10.3733/hilg.v28n04p093
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