SOILS FEETILIZERS. 527 



Norwegian nitrate, lime nitrogen, and nitrogen lime, J. Konig {Ztschr. 

 Landio. Kammer Braunscliweig, 19 {1910), Nos. 33, pi). J^O 5-^01 ; 3Jt, PP- 416- 

 418; Landw. WchnU. Schles. Hoist., 60 (1910), No. 22, pp. 385-391).— This 

 article describes processes of manufacture, and reviews investigations on 

 changes vphicli cyanamid undergoes and on its value as a fertilizer. 



The manufacture of air nitrate, O. Schonherr (Chem. Engin., 11 {1910), 

 No. 5, pp. 129-140, figs. 7). — This is an English translation of a German article 

 v/hich has already been noted (E. S. R.. 22, p. 127). 



The use of potassic fertilizers on primitive soils, H. Gxjepin {Jour. Agr. 

 Prat., n. ser., 20 {1910), No. 80, pp. Ill, 112). — Experiments showing the bene- 

 ficial effect of potash fertilizers on Brittany soils derived from primitive granitic 

 rocks are briefly noted. 



Potash deposits in the Netherlands, D. J. Hissink {Cultura, 22 {1910), 

 No. 268, pp. 612-617). — This is a report on the potash deix»sits which were 

 recently discovered in the Netherlands. These deposits seem to be of the same 

 formation as those of Germany. Analyses of samples gave a potash content 

 of from 3 to 14.6 per cent. The extent of the deposits has not yet been deter- 

 mined. 



Tests of Palmaer phosphate, L. Grandeau {Jour. Agr. Prat., n. ser., 20 {1910), 

 No-s. 27, pp. 11, 12; 28, pp. 47-49). — Comparative tests of this phosphate (dical- 

 cium phosphate) and of superphosphate and Thomas slag with a variety of 

 crops during 1908 and 1909 at the Flahult Moor Culture Station are reported. 

 The results obtained with the new phosphate on the moor soil compared favor- 

 ably with those obtained with the sui^erphosphate and Thomas slag. 



Floats, E. W. Gaither {Ohio 8ta. Circ. 105, pp. 3).— It is stated that the use 

 of floats in connection with farm manures and green manures is becoming quite 

 extensive in Ohio, and this cii'cular was prepared to furnish information on 

 the subject. 



Solubility of calcium phosphate in saturated solutions of carbon dioxid 

 containing ammonia, B. Foster and H. A. D. Neville {Abs. in Proc. Chem. 

 Soc. London, 26 {1910), No. 375, p. 236; Jour. 8oe. Chem. Indus., 29 {1910), 

 No. 22, p. 1323). — "The solubility of calcium phosphate and of the phosphates 

 in commercial phosphatic manures was determined in saturated solutions of 

 carbon dioxid containing ammonia. With increasing quantities of ammonia 

 the quantity of phosphate passing into solution increases at first rapidly, and 

 then more slowly, the solubility of phosphate then being almost directly pro- 

 portional to the amount of ammonia present." 



Investigations on the lime requirements of soils, H. R. Christensen and 

 O. H. Larsen {Tidsskr. Landw. Planteavl, 17 {1910), No. 3, pp. 407-509, 

 figs. 4)- — Extensive experiments were conducted by the authors during 1907 to 

 1909 for the study of laboratory methods for determining the need of lime 

 fertilization on Danish soils. Plat experiments with calcium carbonate were 

 conducted on a large number of farms in different parts of the country and 

 129 soil samples from these plats were secured and analyzed according to the 

 following methods: Qualitative and gravimetric determinations of carbonate, 

 the former by effervescence with dilute hydrochloric acid ; determinations of 

 ammonium chlorid soluble lime (Meyer's method); reaction of the soil; and 

 the biological lime test (behavior toward Azotobacter). 



From the results obtained the authors conclude that none of the laboratory 

 methods renders direct liming experiments superfluous and such are advocated 

 where it is practicable to conduct them. Farmers so situated that they can 

 not conduct field exijeriments are, however, urged to have their soils examined 

 before they apply large quantities of lime or marl. The laboratory examina- 



