University of California

Growth and composition of Deglet Noor dates in relation to water injury


A. R. C. Haas
Donald E. Bliss

Authors Affiliations

A. R. C. Haas was Associate Plant Physiologist in the Experiment Station; Bliss Donald E. was Junior Plant Pathologist in the Experiment Station.

Publication Information

Hilgardia 9(6):295-344. DOI:10.3733/hilg.v09n06p295. March 1935.

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Under the present economic conditions the quality of fruit is of more importance than the quaantity produced. One of the chief factors affecting the quality of dates is a physiological disease known as “water injury” which consists of two types: checking, which predisposes the fruit to blacknose (see p. 328); and tearing, which exposes the pulp to microorganisms that bring about fermentation and decay.

Studies were made on the growth and chemical composition of date fruits at various stages of development. Growth was measured quantitatively as to length, diameter, fresh weight, dry weight, and ash content. Determination of the inorganic constituents and the sugars, together with the discovery regarding the location of the meristematic tissue in the fruit, form a basis for the study of water injury. The analyses furnish some concept regarding the amounts of the various constituents in the fruit and the portion of these amounts wasted as a result of late thinning of the fruit bunches.

Experiments were conducted in the field and in the laboratory to study the factors influencing the cause and control of checking and tearing. These experiments involved the following factors and their relation to water injury and fruit quality: the measurement of water loss due to transpiration of the fruits, the effect of time and type of bagging, and the results of aeration.

Literature Cited

[1] Archbold H. K. Chemical studies in the physiology of apples. IX. The chemical composition of mature and developing apples, and its relationship to environment and to the rate of chemical change in store. Ann. Bot. [London]. 1928. 42:541-566.

[2] Association of Official Agricultural Chemists. Official and tentative methods of analysis. 1925. 2nd ed. Washington, D. C.: Assoc. Off. Agr. Chem. 535p.

[3] Cleveland M. M., Fellers C. R. Mineral composition of dates. Indus. and Engin. Chem. Anal. Ed. 1932. 4:267-268.

[4] Crawford C. L. Growth rate of Deglet Noor dates. Date Growers’ Inst. Rept. 1933. 10:8

[5] Elvehjem C. A., Hart E. B. Iron in nutrition. II. Quantitative methods for the determination of iron in biological materials. Jour. Biol. Chem. 1926. 67:43-51.

[6] Fattah M. T., Cruess W. V. Factors affecting the composition of dates. Plant Physiol. 1927. 2:349-355.

[7] Fawcett H. S., Klotz L. J. Diseases of the date palm, Phoenix dactylifera. California Agr. Exp. Sta. Bul. 1932. 522:1-47. http://archive.org/details/diseasesofdatepa522fawc

[8] Fawcett H. S., Klotz L. J., Haas A. R. C. Water spot and water rot of citrus fruits. California Citrograph. 1933. 18:165 175

[9] Gustafson F. G. Growth studies on fruits. Plant Physiol. 1926. 1:265-272.

[10] Haas A. R. C., Klotz L. J. Nutrition and composition of the Deglet Noor palm in relation to the decline disease. Hilgardia. 1931. 5(16):511-530. DOI: 10.3733/hilg.v05n16p511 [CrossRef]

[11] Haas A. R. C., Klotz L. J. Physiological gradients in citrus fruit. Hilgardia. 1935. 9(3):181-217. DOI: 10.3733/hilg.v09n03p143 [CrossRef]

[12] Haas A. R. C., Quayle H. J. Copper content of citrus leaves and fruit in relation to exanthema and fumigation injury. Hilgardia. 1935. 9(3):143-177. DOI: 10.3733/hilg.v09n03p143 [CrossRef]

[13] Janssen G., Bartholomew R. P. The translocation of potassium in tomato plants and its relation to their carbohydrate and nitrogen distribution. Jour. Agr. Research. 1929. 38:447-465.

[14] Lecoq Raoul. Valeur alimentaire et richesse en vitamines des dattes muscades [Food value and vitamin content of Deglet Noor dates.]. Bul. Soc. Bot. France. 1933. 80:338-348.

[15] Lilleland O. Does potassium increase the sugar content of prunes?. Amer. Soc. Hort. Sci. Proc. 1930, 1931. 27:15-18.

[16] MacDougal D. T. Hydration and growth. Carnegie Inst. Wash. Pub. 1920. 297:1-176.

[17] Nixon Roy W. Observations on the occurrence of blacknose. Date Growers’ Inst. Rept. 1932. 9:3-4.

[18] Nixon Roy W. Notes on rain damage to varieties at the U. S. Experiment Date Garden. Date Growers’ Inst. Rept. 1933. 10:13-14.

[19] Samuel G., Piper C. S. Manganese as an essential element for plant growth. Ann. Appl. Biol. 1929. 16:493-524.

[20] Shaffer P. A., Hartmann A. F. The iodometric determination of copper and its use in sugar analysis. II. Methods for the determination of reducing sugars in blood, urine, milk, and other solutions. Jour. Biol. Chem. 1921. 45:365-390.

[21] Takahashi Ikuro. On the effect of potassium upon citrus fruits. Studia Citrologica. 1931. 5:37-54.

Haas A, Bliss D. 1935. Growth and composition of Deglet Noor dates in relation to water injury. Hilgardia 9(6):295-344. DOI:10.3733/hilg.v09n06p295
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