SOILS FERTILIZERS. 221 



artificial and natural soils with various tVrtilizcr combinations on seedlings of 

 various forest trees are reported. Potash fertilizers checked Ki'owtii, and lime 

 fertilizei-s. slaj:, and jihosphatic fertilizers j^enerally hastened i(. 



Experiments on tlie action of lime nitrogen, Gerlach (iJvitt. Ltuulio. Presse, 

 36 (,190!)), Xo. 33, pp. 353-355). — The results of comparisons of lime nitrogen 

 with nitrate of soda on oats, barley, rye. potatoes, and beets in a large number 

 of field experiments are summarized in this article. The results in general 

 show that the nitrogen of lime nitrogen is the less effective. T;iking the action 

 of nitrate'of soda as 100, that of lime nitrogen on medium fertile soil as 94, on 

 sandy soil OO, and on heavy loam soil 52. In central Germany the cost of 

 nitrogen in lime nitrogen is to that of nitrogen in nitrate of soda as 70: 100. 



The effect of lime nitrog'en containing a high percentage of calcium 

 carbid on plant growth, II. von Feilitzen {Dciit. Laiidw. Prcssc, 36 {1909), 

 No. 30, p. 3n).—li\ comparative tests with winter rye of nitrate of soda and 

 samples of lime nitrogen containing high percentages (5.5) and low percentages 

 (0.1) of carbid. it was found that nitrate of soda applied at the rate of 300 kg. 

 per hectare (about 267 lbs. per acre) retarded but did not prevent germination 

 when the seed was planted immediately after the application of the fertilizer, 

 (lermination was more seriously interfered with and to a considerable extent 

 prevented when application of lime nitrogen immediately preceded seeding. 

 The injurious effect in this case was greater the higher the percentage of cal- 

 cium carbid. AVhen the lime nitrogen was applied 14 days before seeding no 

 injurious effect was observed. 



Acetylene gas refuse as a manure {Gard. Citron., 3. scr., J/S {1909), Xo. 

 1165, p. 26-'i).- — In pot experiments carried out by W. B. Burgess, of the Wye 

 Agricultural College, it was found that the growth of plants (mustard) was in- 

 versely ])roportional to the amount of carbid present. Even 1 per cent had an 

 injurious effect, while 20 per cent comiiletely prohibited growth. 



The actual state of production of synthetic nitrogenous fertilizers, G. 

 Ragondet {Ann. Gcmhioii.v, 19 {1909). Xo. 5. pp. 310-326). — This is a review 

 of the present status of the manufacture of nitrogen comi»ounds from the 

 nitrogen of the air. 



The utilization of atmospheric nitrogen, F. Emicii (Mitt. Xatiinr. I'cr. 

 ,yt<icnnurk, .',.', (1907). Xo. 2, pp. 2 19-22-'/). —Thin article discusses briefly the 

 fixation of nitrogen by means of electric discharges and calcium carbid, and 

 the possibilities of these means of securing supplies of nitrogen compounds for 

 commercial purposes. 



Employing the atmosphere in the service of agriculture. It. Riecke (l^aatcn, 

 Dunger u. Futtermarkt, 1909, No. 15, pp. Jt06-.'iOH. figs. 6). — This is a brief 

 account of the commercial application of the Frank and Caro process for the 

 manufacture of calcium cyanamid. 



The industrial manufacture of calcium cyanamid, II. Marchand (Rev. 

 <icn. HcL, 19 (1908), Xo. 2'/. pp. 9S2-9S6; (ih.^. in Vhnn. Ah.s., 3 (1909), No. 10, 

 p. 1121). — This is a descriiition of the Frank and Caro process. 



Nitric acid and other spark reactions, I'. Askenasv {-Idlirh. Elvktrovlum., 

 12 (1905), pt. 2, pp. 692-701). — The progress in electrochemical processes during 

 1905 is briefly reviewed. 



Nitrogen compounds of carbid, I*. Askknasy (.lalirl). Klcktrochcni., 12 

 (1905), pt. 2, pp. 729-73.'/). — The progress in the development of jirocesses for 

 this purjiose during the year 1005 is re\iewed. 



The present state of the production of nitrate in Norway, I^. de la ValliSe- 

 I'oussiN (Rrr. (Icn. Cliim., 12 (1909). No. 1, pp. I-IS. figs. 19; rtft.s. in Clicm. 

 .\hs.. 3 (1909). No. 10, p. 1121).— 'Hw process, i)roducts. establishments, and 

 output are discussed. 



