128 EXPERIMENT STATION EECOBD. 



Extraction of nitrogen from distillery vinasse, L. Vuaflart (Engrais, 25 

 (1910), A'o. LI, pp. 297, 29H; Sucr. Indig. et Colon., 15 (1910), No. IJ,, pp. 319- 

 321; Betterave, 20 (1910), No. 503, pp. 134-136).— This article describes 

 briefly the biological process devised by J. Efifront (E. S. R., 20, p. 729). 



Fertilizer experiments with, insoluble phosphates, J. Sebelien (Tidsskr. 

 Norske Landbr., 16 (1909), No. S, pp. 339-352; abs. in Zentbl. Agr. Chem., 38 

 (1909), No. 12, pp. 801-80-',; Jour. tioc. Chem. Indus.. 29 (1910), No. 2, pp. 101, 

 102). — Pot experiments with oats and buckwheat were conducted by the author 

 during the seasons of liJUT and 1908 with phosphates of dilTereut origin applied 

 in connection with sodium nitrate or ammonium sulphate. The effects of 4 

 kinds of phosphates were compared, namely, superphosphates containing 19.6 

 per cent phosphoric acid, French Somme phosphate with 28.41 per cent, an 

 Algerian phosphate from Tebessa 26.5 per cent, and Bamble (Norway) apatite 

 31.54 per cent. The latter 3 raw phosphates were applied in fine ground con- 

 dition, at the rate of 200 kg. per hectare (178.5 lbs. per acre). The nitrogen 

 was also given at the same rate per hectare, whether in the form of nitrate 

 or sulphate, and all cylinders received in addition a uniform application of 

 potassium chlorid. 



In the first season's trials with oats larger crop yields were obtained from 

 all phosphatic fertilizers when ammonium sulphate was added than with 

 nitrate ; with buckwheat the same result was obtained except in the case of 

 applicatiMis of superphosphate, which gave a larger increase in yield with 

 nitrate than with sulphate. When ammonium sulphate was applied, both the 

 Algerian and French phosphates pi'oduced better results than did superphos- 

 phate, and the effect of apatite was nearly equal to that of the superphosphate. 

 The second season's trials with oats corroborated in general these results and 

 showed that finely powdered raw phosphates possess a marked fertilizer effect 

 if applied in connection with ammonium sulphate, as has been previously found 

 in experiments by Prianishnikov (E. S. K., 21, p. 722). The second year's 

 trials with buckwheat, in which the soluble salts were added in water solution. 

 Instead of being directly mixed with the sand, as in 1907, were absolute failures 

 for the ammonium sulphate series, as no plants appeared in these cylinders. 

 The author states that no satisfactory explanation can be given of this differ- 

 ence with our present knowledge of the subject. 



The phosphate deposits of the United States, F. B. Van Horn (Nat. Conserv. 

 Com. Rpt., 1909, vol. 3, pp. 558-570). — Substantially the same information as 

 that contained in Bulletin 394 of the U. S. Geological Survey (E. S. R., 22, 

 p. 227). 



Comparative value of ground limestone and burnt lime, S. W. Fletcher 

 (South. Planter, 71 (1910), No. //, pp. Jf03, JM).—This is a brief discussion of 

 the relative commercial and agricultural value of these two forms of lime. The 

 author concludes that with the present prices of burnt lime it would be prefer- 

 able on most soils to use the ground limestone provided this material could 

 be obtained at the farm at a cost not exceeding .$1.75 per ton. 



Concerning the influence of various relations between lime and magnesia 

 on the development of plants, II, L. Beknardini and A. Siniscalchi (l^taz. 

 Sper. Agr. Ital., 42 (1909), No. 4-6, pp. 369-386; abs. in Jour. Chem. Soc. 

 [London], 98 (1910), No. 567, II, p. 61). — Already noted from another source 

 (E. S. R., 22, p. 433). 



Manganese in agriculture, H. Bartmann (Jour. Agr. Prat., n. ser., 19 (1910), 

 No. 4, pp. 115-117, figs. 4; Engrais, 25 (1910), No. 16, pp. 441, 443).— The 

 various exi)eriments which have been made with manganese as a fertilizer are 

 briefly reviewed. 



