19171 SOILS FZr.n^-liLSS. 721 



S^veci^h E>eai sod defioeot in aitroawn showed that manure alMie did cot give 

 gvx>i ^esu^ts bet tb«t excellent resnlts w^ere obtained witli anif oial fercilLrers. 

 It is: ooncloded that manure siiould be used on such soils only in CKV.erste 

 amounts to stimolatB hacrerial action, while plar.t nutri«its should be r-.ptlied 

 by the use of artificial lertilirers. Msnure also gave poor results on \vhite 

 moss soil pvreTkmsiy treated with phosphates and potash. 



American sources of nitrogen. T. H. No«po:» (5<». Amcr^ 116 U^ITK 3ro- IS, 

 pp. 394- -M-'- -Mi. yk^ 4^- — This is a review of the present situation with refer- 

 ence to the eoonc«mo pffoduction in the United States of combined nicrogiai for 

 militaTT. agricultural, and industrial needs. 



nie producticn of sulphate of ammonia for 1915-16 (3rr<r Torfc.* The Bsr- 

 reti Co.. pp. IS. pL 1. ilg. iK — This pamphlet summariies data on the produc- 

 tion of amiaonium sulphate in the world during 191S. but states that no figures 

 have been available ironi Germany since 1913. Tbe piodtKtion in the United 

 States for 1916 is estimated at 325,C*X) toas. an increase of 30 per c«ii over the 

 figures for 191a. Of this produaion 272.000 t<»s are credited to coke ovens 

 and 5S.iX>0 tMJS to gas works and K^ne carbonizing i>lants- The consumption 

 of all forms ol amznociia in the United States totaled 315.424 tons in 1915 and 

 347. 70S tons in 191& 



Adsorption of ammonium sulphate by soils and quartz sand. — Preliminary 

 conunonication. M. L Wot.KOiT v^ou ;?ci.. 5 (1917 K Xo. 6. pp. 55i-5(J4>. — ^A 

 sunnnary of the results of experiments at Rutgers Colle^ is iv^:rted on the 

 adsorption of ammonium sulphate solutions cfl2.14.lS,llS.l "SS. 1 ^ 

 1 12S, and 1 256 normal conoectrations by medium sandy loam, medium loam, 

 medium silt loam, heavy silt loam, shaley loam, muck, and quarts sand passing 

 the 24. 60. and 124 meeh and 5 and 7 D beating doth. 



The results in general showed that with the increasse in concentration of tte 

 ^mmoflium solphate sotntioQ the percentage of ad9orpck»i decreased, while the 

 Mai amount of salt that wait out of solutloa increased. The quarts sand 

 did not wb<rily follow the general rule, as did the agricultural soils, for instead 

 of the decrease of the concoitraticvi of the salt solution on its addition to the 

 soiL its concentration became greater. This pheiMm»K>n was most piOMMmeed 

 in the coarse quartz sasd and diminished with the increase in tiie Sbokss of the 

 materiaL Also the effect was more noticeable in the more cc»Dcentrated soln- 

 tkns than in those less conoMitrated. In the nner grades of the quartz treated 

 with the comparative dilute solutions the point was reached after whidi the 

 ccaicentrstion oi the resultant solntickn in the mixture with sand was less than 

 that of the original solution. After a certain point, whidb evidently is s^vcific 

 for a given quarts sand, the quam sand fc^owed the same general rule that 

 soils follow. In the case of the coarse sand which is designated as 24-mesh the 

 depression of the salt scdution after arpl: cation was greater in every instance 

 than the depression of the freeEing pv>int of the solution before ap-plicatio«L 

 The percentage of the increase in depression, however, gradually decreased with 

 the dilution of the applied sohatitm. With the finer grade of the quarts sand 

 I ^SO-mesh) in the first three concentrations there was a striking similarity to the 

 results obtained wiA the coarsest material. But begiiming with the cc^tcen- 

 tration 1 32-nornuLL there was an adsorptic^i of the salt by the quarts sand. 

 the percentage of this adsorption increasing with the dilution of the solution. 



" Hie results tend to show Aat the heavier the soU the greater is the amount 

 of die salt adsorbed. The time in which the soil is allowed to be acted upoa 

 by the salt solution influences the percentage of the salt adsorbed. In the light 

 sandy soil the maximum adsoipcMMa was reached in about 24 hours, while in 

 the heavier type this point occtirs after as many as 72 hours. The temperature 

 from to 3l* G at which the reaction is allowed to proceed f_ffects the degree 



