FERTILIZEES. 



C55 



superior to the other phosphates tested. These results confirm those reported by 

 Wagner and Gerlach (E. S. R., 15, p. 571). 



The quality of the Thomas slag employed in Carinthia in the year 1903, 

 F. Schulze (Ztschr. Landw. Versuchsw. Oesterr., 7 (1004), No. 10, pp. 742-745).— 

 Determinations of total and citric-acid-soluble phosphoric acid in a number of 

 samples of Thomas slag are reported. 



The determinations of the total amount of material dissolved in 2 per cent citric 

 acid by evaporating an aliquot of the citric-acid solution, incinerating, and weighing, 

 and of the undissolved material left on the filter by drying, incinerating, and weigh- 

 ing, gave such variable results that no conclusions could be drawn as to their bearing 

 upon the relative value of the slags. 



Phosphate shipments ( Tradesman, 52 ( 1905), No. 9, p. 128). — A table shows the 

 shipments of phosphate from southern ports to domestic and foreign destinations in 

 11)02 and 1903. The total domestic shipments in 1903 were 218,246 tons, foreign 

 766,302 tons, as against 237,506 tons and 751,216 tons, respectively, in 1902. 



Rock phosphate, B. C. Aston (New Zealand Dept. Agr. Rpt. 1904, pp- 144-146).— 

 The phosphates which are found in large deposits in the southern portion of New 

 Zealand are briefly described, and results of partial chemical analyses are reported. 



The utilization of free nitrogen, A. Wieslek (Ztschr. Angew. (lain., 17 (1904), 

 No. 45, pp. 17 13-1719). — This article reviews the history of attempts to fix the free 

 nitrogen of the air by means of electrical discharges, describing the more important 

 processes which have been devised and comparing their relative efficiency. It also 

 gives some account of Woltereck's method of fixing nitrogen by passing the air over 

 red-hot iron, and of the method of fixing atmospheric nitrogen in the form of calcium 

 cyanamid. 



The following table, prepared by E. Rasch/' showing the relative efficiency of 

 different electrical methods, is quoted: 



Relativt efficiency of different electrical methods of fixing atmospheric nitrogen. 



The migrations and transformations of nitrogen in nature and its utiliza- 

 tion and control in agricultural practice, P. Wagner (Arb. Dent. Landw. Gesell., 



1904, No. 98, pp. 28-46). — A general discussion of the importance of conserving and 

 utilizing to the best advantage various sources of nitrogen— leguminous plants, barn- 

 yard manure, nitrates and sulphate of ammonia, and "lime nitrogen." 



A contribution to the subject of the fertilizing value of lime nitrogen, Ziel- 

 storff (Illus. Landw. Ztg., 24 (1904), p. 1103; abs, in Chem. Ztg., 28 (1904), No. 101, 

 Repert. No. 30, p. 370). — Pot experiments to determine the relative value of nitrate 

 of soda, sulphate of ammonia, and lime nitrogen are reported. 



When the fertilizing materials were applied at time of seeding the lime nitrogen 

 showed an efficiency of 88.4 per cent, as compared with 100 per cent for nitrate of 

 soda and 81.1 per cent for sulphate of ammonia. When the lime nitrogen was 

 applied a few days before seeding its relative efficiency was increased to 92.8 per 



« Dingier' s Polytech. Jour., 318 (1903), p. 268. 



