SOILS FERTILIZERS. 425 



1, figs. 4). — The results of the pot experiments reported show that straw and 

 ammonium sulphate were to a certain extent mutually compensating in fertiliz- 

 ing effect. 



Green manure farming, M. Hoffmann (.4/?;. Dcut. Landw. Gesell., 1911\ No. 

 200, pp. 118, pi. 1, figs. 11). — A detailed account is given of experiments made 

 during 1905 to 1908 on 9 estates in competition for money prizes offered by the 

 German Agricultural Society. No generalization from the work is attempted, 

 as this is to be done in a series of articles which are to appear later. The 

 economics of green manure farming under German conditions receives special 

 attention in the discussion of results. A list of publications of the German 

 Agricultural Society on green manuring is appended. 



Manganese chlorid in the treatment of night soil, L. Chaptal {Prog. Agr. 

 et Vit. (Ed. rEst-Centre), 32 (1911), No. 25, pp. 77S-7S2; abs. in Internat. Inst. 

 Agr. [Rome], Bui. Bur. Agr. Intel, and Plant Diseases, 2 (1911), No. 7, p. 

 1622). — The successful use of residue from the manufacture of chlorin in the 

 preservation of night soil is reported and discussed. 



The fixation of atmospheric nitrogen, A. Brocket (Rev. G&n. Set., 22 (1911), 

 Nos. 22, pp. 863-869, figs. 2; 23, pp. 908-918, figs. 7).— This is a review of 

 methods employed in the electro-chemical fixation of the free nitrogen of the air. 



The use of cyanamid as fertilizer, L. Malpeaux (Jour. Agr. Prat., n. ser., 

 22 (1911), No. J,7, pp. 6Ii7-651; abs. in Bl. Zackerriihenbau, 18 (1911), No. 22, 

 pp. 875, 376). — Comparative tests of calcium cyanamid, ammonium sulphate, 

 sodium nitrate, and calcium nitrate on cereals, sugar beets, potatoes, rutabagas, 

 and poppy are reported. 



The results showed that the effect of the fertilizers varied with the nature 

 of the soil and the meteorological conditions. In general the calcium nitrate 

 was comparable in effect with sodium nitrate, and cyanamid under the condi- 

 tions of these exiieriments was slightly superior to ammonium sulphate. An 

 objection to the cyanamid is the difficulty of its application. 



On the change of calcium cyanamid in the soil and its after-treatment 

 in the factory, B. Carlson (Svensk Kern. Tidskr., 23 (1911), Nos. 3, pp. 63-66; 

 If, pp. 70-88). — The history of calcium cyanamid and its application as a fer- 

 tilizer is given, with a resume of our present knowledge of its composition and 

 value for fertilizing purposes and the conditions under which deleterious results 

 may follow from its handling and application. In order to avoid the latter 

 treating the calcium cyanamid in the factory with carbon dioxid and water 

 is recommended. 



The hygroscopicity of Norwegian nitrate, S. Hals (Cliem. Ztg.. 35 (1911), 

 No. 121, p. 1130). — Determinations of gain in weight and change in composition 

 of Norwegian nitrate in storage are reported, showing that in 312 days 100 

 kg. of the nitrate gained on an average 3 kg. in weight. The loss in nitrogen 

 was not great. 



[Production and consumption of Chilean nitrate], E. Fishee (Asoc. Sal. 

 Propaganda, Circ. Trimest. 56, 1911, pp. L-LXXVI). — According to the statis- 

 tics reported by the Nitrate Propaganda the production of nitrate in Chile 

 during 1910 was 2,722,076 tons and during the first 9 months of 1911, 2.055,780 

 tons; the world's consumption during 1910 was 2,605,877 tons and during the 

 first 9 months of 1911. 2,260,549 tons. The consumption in the United States 

 in 1910 was 578,808 tons and during the first 9 months of 1911, 509.659 tons. 



Experiments with different potash minerals, D. N. Prianishnikov and 

 A. G. DoiARENKO (Izv. Moskov. Selslc. KJioz. Inst. (Ann. Inst. Agron. Moscou), 

 17 (1911), No. 2, pp. 218-2JiO, figs. 8). — In continuation of previous experiments 

 (E. S. R., 24, p. 24) various potash silicates were tested in sand cultures. 



