80IL8 FERTILIZERS. 539 



The results of the pol experiments with the guano in comparison with nitrate of 

 Boda and Bulphate of ammonia indicate thai the phosphoric acid is nearly as effectiv< 

 as thai of Thomas Blag and the nitrogen but Blightlj less effective than thai of am- 

 monium sulphate. 



Experiments on the fertilizing- value of mixtures of Thomas slag- and 

 steamed bone meal with kainit, I'.. Haselhofi I Landw. Jahrb., 34 {1906 . Vb. 

 .; I, pp. 623 684, pis. ?).- Po1 experiments in L 902 and L903 with wheal and barlej 

 arc reported in detail. 



I Observations <>n the after-effects of the fertilizers and the influence of lime in con- 

 nection with the other fertilizer mixtures are also recorded. The results sho\* in 

 general thai the addition of kainit increased the effectiveness of the phosphoric acid 

 in the case <»t' both Thomas Blag and bone meal. This was due apparently to the 

 action of the kainit in rendering the phosphoric acid more readily available to the 

 plant. The addition of lime in form of carbonate reduced the efficiencj of the phos- 

 phoric acid in the bone meal to a marked extent. 



Experiments on Thomas slag- rich in silicic acid, E. Haselhoff i Landw. 

 Jahrb., 34 I 1905), No. 3-4, />/>■ 635-631 I.— Comparative tests of Thomas Blag poor in 

 silicic acid and thai in which the silicic acid had been increased by Hoyermann's 



process showed a somew hat lower elliciemw of the latter. 



Experiments with steamed Thomas slag-, E. Haselhoff {Landw. Jahrb., 34 

 {1905), No. 3-4, />/'■ 637-641)- — Ground Thomas slag' and that which had been 

 reduced to powder by treatment with steam under pressure were tested in pol experi- 

 ments with barley. The results show no marked difference in effect between the 

 two forms of slag. 



Potash salts, .M. Maercker and M. Eoffmann {Du Kalisalze. Berlin: Deut. 

 tandw. Oesell., 1905, 3. ed., pp. VII 61). — This is the third edition of this treatise 

 intended for the use of practical farmers. The second edition, published aboul 

 10 years ago, has been revised and brought up to date in this edition, which is 

 published under the auspices of the fertilizer section of the German Agricultural 

 Society. 



On liming-. ( >. LoewI Ztschr. Landw. Versuchsw.Oesterr.,8{1905),No.6,pp.583-602). 

 This article reviews quite fully recent investigations, i neluding those of the author 

 and his associates, on the use of lime as a fertilizer, concluding that the results con- 

 firm the author's well-known \ iews regarding the necessity of maintaining a definite 

 relation between lime and magnesia in the soil in order to insure the highest pro- 

 ductiveness. It is also necessary that neither lime nor magnesia should fall helow a 

 certain limit. For this reason it is urged that in soil analysis determinations should 

 always he made of the magnesia as well as of the lime. 



Fertilizer sug-g-estions, E. \i. Flint {Florida .V". Bui. 81, pp. 365 390). — The 

 formulas and suggestions contained in this bulletin are compiled from experiments 

 made hy the station in Florida and those of neighboring States. The fundamental 



facts underlying the use of fertilizers are discussed, the raw materials nsed in pre- 

 paring fertilizers are described, and formulas for fertilizers for various field crops, 

 fruits, and vegetables commonly grown in Florida are given. 



Commercial fertilizers and chemicals, T. (i. Hudson ki \i. i Bui. Ga. Dept. 

 Agr., 1905, No. ./'/. pp. 905). — This is a report on inspection of fertilizers on sale in 

 Georgia during the season of L904-5, including the text of the fertilizer laws of the 

 state and miscellaneous information regarding fertilizers, as well as statistics by 

 counties of the cotton crop of < reorgia, 1900-1904. 



Fertilizer analyses, A. .1. Patten {Michigan Sta. Bui. '■'>.'. pp. ?8). — This bul- 

 letin gives the text of the state fertilizer law. a list of dealers in fertilizers in the 

 State, and analyses of 123 samples examined during 1905. 



