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Variation in the Chemical Composition of Mangels

Published online by Cambridge University Press:  27 March 2009

T. B. Wood
Affiliation:
Reader in Agricultural Chemistry
R. A. Berry
Affiliation:
Assistant Chemist in the Department of Agriculture of the University of Cambridge.

Extract

Below is a brief summary of the chief points of interest which our investigations appear to have suggested so far:

That the most convenient method of sampling roots for analysis is to remove a core from each root, and that when using this method at least 50 roots must be cored in order to obtain a sample representing the composition of the bulk of roots grown on a field.

That a large proportion of the commonly grown strains of mangels may be assigned to one or other of five types.

That of these types, four have their cropping power and percentage of dry matter so nearly in inverse proportion that they yield practically the same weight of dry matter per acre.

That the fifth type, Long Bed, yields considerably more dry matter per acre than the other four varieties.

That large roots on the average contain more water and less dry matter than smaller ones.

That there is a considerable variation in the composition of mangels from year to year, probably depending on such conditions as rainfall and sunshine at particular periods of growth.

That manurial treatment causes distinct variations in composition, the most noticeable point being that excessive applications of nitrogen delay ripening and decrease the percentage of dry matter.

That different farms grow roots of different composition.

That there is very great variation among individual roots of the same variety grown side by side, in content of dry matter, sugar, and nitrogen, and in size, shape, colour; in fact, in all the characters which we have been able to observe.

That there is so little correlation between the different characters that it is possible to pick out for seed-mothers large roots containing high percentages of dry matter rich in any desired constituent, and it is suggested that, from analogy with the sugar beet, continuous selection carried out in this manner may result in improvement in any desired direction.

That since colour, shape, and specific gravity of root or of juice are shown not to be correlated with percentage of dry matter, sugar, or nitrogen, selection for these characters is not likely to lead to any improvement.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1905

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References

page 176 note 1 Annual Reports of the Norfolk Chamber of Agriculture.

page 176 note 2 Ibid., and Journal of the Board of Agriculture, 1899, VI. p. 811.Google Scholar

page 176 note 3 4th Annual Report Camb. Univ. Dept. of Agric. 1901–2, p. 73.

page 177 note 1 Proc. Camb, Phil. Soc. 1903, XII. 2. 97Google Scholar; 5th Annual Report Camb. Univ. Dept. of Agr. 1903; Report of Brit. Assoc. Agric. Sub-Sec. 1904.

page 177 note 2 “Farm Foods,” Cousins' Trans, p. 306.

page 177 note 3 Chemistry of the Farm, 1902 ed., p. 130.

page 177 note 4 Book of the Farm, 4th ed. I. 265.

page 177 note 5 R.A.S.E. Journal 1866, II. 2. p. 201.Google Scholar

page 177 note 6 Highland Soc. Trans. 1853–5, p. 274.

page 177 note 7 Highland Soc. Trans. 1855–7, p. 183.

page 178 note 1 Our Farm Crops, I. p. 450, Edinburgh, 1859.Google Scholar

page 178 note 2 Jahresbericht über Agric. Chemie, 1880 to 1890.

page 178 note 3 Annual Memoranda, 1901.

page 179 note 1 10th Annual Report Durham College of Science, 1901.

page 184 note 1 Bertrand, , Ann. Agr. XXIII. p. 385, 1897.Google Scholar

page 184 note 2 R.A.S.E. Journal, III. XI. p. 57, 1900.Google Scholar

page 186 note 1 Wilson, , Our Farm Crops, Vol. I. p. 407, Edinburgh, 1859Google Scholar; Baynbird, R.A.S.E.Journal, I. VIII. p. 217, 1847.Google Scholar

page 196 note 1 Report of Holmes Chapel Agric. and Hortic. School, Cheshire, C. C. 1900.

page 197 note 1 Reports of Harper-Adams Agric. Coll. 1903–4.

page 197 note 2 Ann. Agron. XXIV. p. 97, 1898.Google Scholar

page 197 note 3 Illust. Land. Zeit. XXIV. 12. 1904.Google Scholar

page 207 note 1 Report of Royal Vet. and Agr. Lab. Copenhagen, 1899. Quoted from Expt. Stn. Record, XI. p. 68.

page 207 note 2 Seventh Annual Report, Northumberland Demonstration Farm.