FEETILIZERS. 557 



"The reHults uf both field and iilat experiiiu'iits show that certain clayses of phos- 

 phates are more availal)le and hence have a higher agricuhnral vakie than would be 

 given them by official methods of analysis. This condition would seem to war- 

 rant some modified method for analyzing such materials. This is particularly true 

 of the tetra-phosphates when used on some soils." 



Investigations relative to the use of nitrogenous materials, E. B. Voor- 

 iiEEs [XeifJerscn Sta.s. Rpt. i:)01,pp. 144-18^^). — The investigations here reported area 

 continuation of those of previous years (E. S. R., 18, p. 727) and have in part been 

 discussed in Bulletin 150 of the station ( E. S. R., 13, p. 435). The composition of cow 

 manure (mixed and unmixed solid and liquid) before and after being subjected to 

 leaching and experiments ■w;ith the different kinds of manure on oats followed by 

 corn, without additional manure, are reported, the main purpose being to compare 

 the availability of the nitrogen of the different kinds of manure with that of other 

 fertilizing materials. Taking the nitrogen recovered by the crops as 100 in case of 

 nitrate of soda, the relative availabilit}- observed was as follows: 



Relative auailabilUy of nitrogen in different forms. 



: Oats and 

 corn. 



Nitrate of soda ; 100. 00 j 100. 00 



Sulphate of ammonia 90. 22 i 87. 75 



Dried lilood GS. 35 73. 07- 



Soliil inanure, fresh 14. 16 26. 36 



Solid niannre. leached ! 9. 67 j 21. 99 



Solid and liquid manure, fresh j 40.10 , 51.46 



Solid and liquid manure, leaclied 28. 91 ! 35. 91 



"It is ciuite apparent that in the residual effect considered, the availability of the 

 manure, especially the solid manures, is increased very considerably. At the fame 

 time the availability of the nitrate and of the ammonia is decrea.sed." 



The availability of organic nitrogen in raw materials, J. P. Stkeet [New 

 JerM'ii Slas. Rpt. 1901, pp. lS7-14S).—T\ie, solul)ility of nitrogen of 31 classes of mate- 

 rials in potassium permanganate solution, a.s determined l)y a method described in an 

 earlier report (E. S. R., 11, p. 720), is reported and discussed. The average results 

 obtained were as follows: Horn meal (1 sample) 95.9 percent, ammonite (2 samples) 

 9-1.5, concentrated tankage (1 sample) 93.7, cracklings (1 sample) 93.5, dried blood 

 (15 samples) 93, hoof meal (2 samples) 91, castor pomace (1 sample) 90, peanut pulp 

 (1 sample) 89.3, pigeon manure (1 sample) 88.8, degelatinized bone (1 sample) 87.3, 

 button bone (2 samples) 85.4, tankage (15 samples) 85.2, steamed bone (3 samples) 



84.6, dissolved bone (2 samples) 83.1 and 62.7, dried fish (43 samples) 81.1, cotton- 

 seed meal (3 samples) 80.3, bone sawings (3 samples) 77.8, linseed meal (1 sample) 



77.7, soft ground bone (1 sample) 71.6, wool waste (6 samples) 71.3, horse meat (1 

 sami>le) 70.4, raw bone (4 samples) 67.4, dissolved tankage (2 samples) 64.5, king 

 crab (2 samples) 62.5, hair manure (1 sample) 54.6, burned garbage (1 sample) 51.5, 

 garbage fertilizer (3 samples) 48.7, snuff sand (1 sample) 48.3, steamed leather (1 

 sample) 39.5, treated leather (1 sample) 33.4, raw leather (1 sample) 25.5 per cent. 

 In case of dried blood the solubility ranged from 87.4 to 95.6, with an average of 93 

 per cent; dried fish from 56.1 to 92.9, with an average of 81.1 per cent; tankage from 

 65 to 93.2, with an average of 85.2 per cent. 



A review of the investigations concerning denitrification [Neir Jersey Slaf^. 

 Rpt. 1001, j^p. 183-210). — A very c(jmplete review , which has been noted elsewhere 

 (E. S. R., 14, p. 234). 



Nitrate of soda in Africa, Maiziekes {L' Eii</r<ii.-<, 17 (1903), Xo. 4-'>, ]>p- 1070- 

 1073, fig. /).^A brief discussion of the probable occurrence of extensive subterranean 

 deposits of nitrate of soda in the region of the oasis of Touat, in Algeria. 



l(;39s— No. 0— o:) 4 



