220 EXPERIMENT STATION EECOKD. 



Sodium nitrate produced about the same result whether applied in one dose 

 or in two. Tailing the average action of the sodium nitrate on rye, barley, 

 oats, potatoes, sugar beets, and fodder beets as 100, the average of the action 

 of ammonium sulphate on these crops and on wheat in addition was 84, of 

 lime nitrogen on the same crops as in the case of ammonium sulphate 76, of 

 calcium nitrate on the same crops 99, of calcium nitrite on oats, potatoes, and 

 sugar beets 90, and of liquid manure on barley, oats, potatoes, and fodder 

 beets 64. 



As the average of all of the results, it was found that 61 per cent of the 

 nitrogen applied in the form of sodium nitrate was recovered in the crop. 

 Taking the recovery of nitrogen from sodium nitrate as 100, the recovery in 

 the case of ammonium sulphate was 78, of lime nitrogen 65, of calcium nitrate 

 91, of calcium nitrite 54,- and of liquid manure 57. The percentage of nitrogen 

 in the crop was very slightly influenced by nitrogenous fertilizers. This was 

 especially true in the case of the roots and tubers, but also true of leaves and 

 vines. The influence of the nitrogenous fertilizers on the quality of the product 

 was scarcely noticeable. 



The action of different nitrogenous fertilizers, Gerlach {FiihUng's Landw. 

 Ztg., 64 {1915), No. 1, pp. 1-7). — The results here reported are noted for the 

 most part in the above. 



The action of common salt in combination with ammonium sulphate, 

 ScHNEmEWiND {Landw. Wchnschr. Sachsen, 11 {1915), No. 1, pp. 3, 4)- — Field 

 experiments with beets and wheat in which ammonium sulphate was used in 

 combination with kainit and with 40 per cent potash salt mixed with twice Its 

 weight of common salt are briefly reported. The results indicated that the com- 

 bination of ammonium sulphate with kainit is fully as effective and more 

 economical. 



The Perils phosphate mines (Indische Merciiur, 3S {1915), No. 8, pp. 133- 

 i35). ^This article discusses the origin, extent, composition, and fertilizing 

 value of the phosphates occurring in Perils, the northernmost State of Siam. 

 Analyses reported show that the phosphate contains about 21 per cent of 

 phosphoric acid, about 10 per cent of which is soluble in 2 per cent citric acid, 

 2.7 of ferric oxid, 4.7 of alumina, 27 of lime, 0.43 of potash, and 0.32 of nitrogen, 

 largely nitrates. 



Double superphosphate, E. Bernabd {KisMet. Kozlem., 11 {1914), No. 5, pp. 

 709-724). — This article discusses briefly double superphosphates in general, but 

 deals especially with the properties of a double superphosphate prepared by 

 the author's method. This superiihosphate is moderately hygroscopic, due to 

 the presence of free phosphoric acid (about 11 per cent). The water-soluble 

 phosphoric acid amounts to from 40 to 43 per cent, and the sum of the water- 

 soluble and citric acid soluble phosphoric acid to from 44 to 46 per cent. 



Ground limestone for sour soils, F. H. Hall {New York State 8ta. Bui. 

 400, popular ed. {1915), pp. 8, fig. 1). — This is a popular edition of Bulletin 400, 

 previously noted (E. S. R., 33, p. 26). 



The fertilizer law and rules and regulations for its enforcement, B. H. 

 HiTE {West Virginia Sta. Circ. 16 {1915), pp. 11, fig. i).— The text of the West 

 Virginia fertilizer law enacted in 1901 and the rules and regulations pro- 

 mulgated under its provisions are given. 



AGRICULTTrRAL BOTANY. 



Department of botanical research, D. T. MacDougal {Carnegie Inst. Wash- 

 ington Year Book, 13 {1914), pp. 63-104, figs. 5). — This is a progress report of 

 the investigations carried on by members of the staff, collaborators, and re- 



