724 EXPERIMENT STATION RECORD. 



Ztg., 1906, No. 9Jf, pp. 10). — Various experiments with lime niter, lime nitrogen, 

 etc., in comparison with ammonium sulphate and nitrate of soda are reviewed, 

 showing that while these newer products are not equal to nitrate of soda in 

 fertilizing effect they show a high degree of efficiency as fertilizers and can 

 now be made at prices which will make them a factor in regulating the price of 

 nitrate of soda, this being especially true in case of the. lime niter. 



On the future supply of combined nitrogen, S. Zeisel {Wiener Lanclxv. Ztg., 

 1906, Apr.: (ih.^. in >^taz. >Spcr. A{/r. Hal., 39 {1906), No. 6-1, pp. 623-629).— 

 This article disc-usses the possibilities of the natural deposits and of the various 

 methods of artificial preparation of nitrogen compounds. 



Pot experiments on the action of lime nitrogen, A. Stutzeb {Landiv. Vers. 

 Stat., 65 {1906), No. 3-Ji, pp. 275-2S2: abs. in Jour. Chein. Soc. [London], 92 

 {1907), No. 531, II, p. 4S).— The literature of fertilizer experiments with lime 

 nitrogen is reviewed and pot experiments carried out by the author are briefly 

 reported. 



In pot experiments with rye followed by three crops of mustard in succession 

 without further manuring the lime nitrogen gave nearly as good results as 

 nitrogen in aumionium sulphate and better than that of sodium nitrate, the 

 low results with the latter being attributed to leaching. 



The technical problem of nitrates, G. Hostelet {Rev. Econ. Internat., .} 

 {1906), No. 3, pp. 620-630). — The world's supply of nitrates and the possibility 

 of increasing this supply by artificial means are discussed. 



The artificial production of nitrate of lime, J. B. C. Kershaw {Sci. Prog. 

 Tiventieth Cent., 1 {1906), No. 2, pp. 361-36-'t). — A brief account is given of the 

 progress which has been made in electrical fixation of the nitrogen of the air. 



Fall application of nitrate of soda, P. Pipers {Rci\ Gen. Agrou.. n. ser., 1 

 {1906), No. 8, pp. 325-339). — Cooperative plat experiments with rye, wheat, 

 oats, potatoes, beets, and clover, to test the advisability of applying nitrate of 

 soda in the fall are briefly reported. 



The general conclusions reached were that a small application of nitrate of 

 soda is indispensable for cereals on soils poor in nitrogen, such application 

 insuring_a profitable return. Small applications of nitrate- in the fall are also 

 recommended on good soils when the seeding is late. In this case, even though 

 th?re may not be a direct benefit, the necessary expenditure is advisable as an 

 insurance against winter injury. 



The production of ammonium sulphate in Italy, C. Montanari {Staz. Sper. 

 Agr. Ital., 39 {1906), No. 6-1, pp. 6'iO-W 7). —Statistics on this subject are 

 briefly summarized. 



The manufacture of superphosphate, C. Elschner {Amer. Fert., 25 {1906), 

 No. 5, pp. 5, 6, fig. 1). — This article discusses especially European methods of 

 recovering and utilizing the fluorin gases driven off in the preparation of 

 superphosphates. 



A process for preparing easily soluble compounds of phosphoric acid 

 and silicic acid, W. Wolters {German Patent No. 110,353; abs. in Ztschr. 

 Angeiv. Chem., 20 {1901), .No. 1, p. 32). — The process consists of fusing raw 

 phosphates with lime and artificial silicates and rapidly cooling the fused mass 

 with cold water or by throwing it upon cooled metal plates. It is claimed that 

 by this means the phosphoric acid is rendered almost completely citrate soluble. 

 It is also claimed that the artificial silicates are better adapted to the process 

 and yield a product of higher citrate solubility than the natural silicates. 



Investigations on the action of Wolters phosphate, A. Stutzer {Dent. 

 Landir. Presse, 33 {1906). No. 93. p. 137; Landir. Vers. Stat., 65 {1906). No. 3--',, 

 pp. 283,284)- — This article briefly refers to experiments by various investigators 



