34 



XXXIX. E. J. RussKLL. " The Composition of Potatoes 

 immune from Wart Disease," journal of the 

 Ministry of Agriculture, 1920. ' \'ol. XXVII. 

 pp. 49-51. 

 An examination of 32 immune varieties of potatoes grown in 

 1919 and forwarded by the Glamorgan County Council. A 

 general comparison only can be made with non-immune varieties, 

 but the figures for dry matter and nitrogen content are of the same 

 order as found at Rothamsted for the ordinary varieties of the 

 country. There is nothing to sugg-est that the value to the pur- 

 chaser would be any less, or that the supply of food Vvould be 

 adversely affected if immune varieties were substituted for non- 

 immune. 



FERTILISERS. 



XL. E. J. Rlssell. " Report on the possibility of 

 using Nitre-cake in the Manufacture of Super- 

 phosphate." Ministry of Munitions, 1918. 

 An investigation to ascertain the conditions under which 

 nitre-cake could be used as a substitute for sulphuric acid in the 

 manufacture of super-phosphate, and the extent to which the re- 

 placement would be possible (see p. 26) . 



XLI. R. A. Berry, G. W. Robinson and E. J. Russell. 



'' Bracken as a Source of Potash/' Journal of the 



Board of Agriculture, 1918. Vol. XXV. pp. 1-11. 

 During the war a search was made for possible sources of 

 potash, and bracken ash seemed distinctly promising. Analyses 

 were therefore made of samples obtained from various parts of the 

 country, from which it is concluded that an acre of bracken cut in 

 July or Aug-ust — the best months for the purpose — might yield 

 from 60 to 2901b. potash (K2O) per acre according to locality, 

 Ayrshire giving the best results. 



XLII. E. J. Russell. " The Use of Ammonium Nitrate as 



Fertiliser." Journal of the Board of Agriculture, 



1919. Vol. XXV. pp. 1332-1339. 

 The cessation of hostilities enabled the Ministry of Munitions 

 to liberate large quantities of Ammonium Nitrate for fertiliser pur- 

 poses, and as this possibility had been foreseen, experiments had 

 been put in hand for some time previously. Ammonium Nitrate 

 was found to be highly effective as a fertiliser, but to suffer from 

 two defects : — It tends to attract water from the air (although this 

 tendency can be diminished by suitable factory treatment), and it 

 then sets to a solid which is not easily broken up ; and it cannot be 

 sent out in bags, but must travel in barrels, which is always an 

 expensive mode of transit. Its great value is as a top dressing, 

 for which it is particularly well suited, being probably the most 

 rapid nitrogenous fertiliser known. 



XLI 1 1. E. J. Russell. '' Synthetic Nitrogen Fertilisers." 



journal of the Ministry of Agriculture, 1921. Vol. 



XXVII. pp. 1037-1045. 

 An account of the following fertilisers now being produced in 

 various factories from the nitrogen of the air : — Nitrate of lime, 

 nitrate of ammonia, ammonium carbonate, ammonium chloride, 

 urea, cyanamide or nitrolim. 



