SOILS FERTILIZERS. 925 



lent to nitrate of soda and sulitliate of aninionia as an artificial fertilizer. 

 (5) On some soils the use f)f lime nitrofjen is not reoonmiended. 



Is it economically expedient to use potash fertilizers? Z. Bonomi {Ann. R. 

 t^tnz. i<pn: Ai/r. I'llinc. 9 { I90S), pp. .',-21!). — A rei»>rt is ^iven on tests of the 

 effect of suli)hate of potash on clover, medic, n.itural iieiiiianent meadow, and 

 wheat and clover. 



The amount of sulphate of potash used was ISO ll>s. iter acre on all the plats 

 except one of clover and one of medic, which received i;);j Ihs. per acre, and one 

 of clover, which received 22.") lbs. jter acre. Every plat showed an increased 

 product. This increase was enough to j^ive a profit over the cost of fertilizer 

 in the first year on some of the jtlats of clover and medic, and on the wheat and 

 clover. The second year showed enough increase to leave a profit except on 

 one plat of natural iiermanent meadow, which was a special soil. 



Raw rock phosphate (Amcr. FerL, 29 (1908), No. 2, pp. 5-9). — This is a 

 statement by the Xational Fertilizer Association summarizing conclusions 

 reached from various exjieriments as to the relative efficiency of raw and dis- 

 solved phosphates. The general conclusion reached is that " the experience 

 of the (Jerman experiment station.s, conil)ined with a majority in this country, 

 show emphatically that raw rock phosphate has little or no fertilizing value, 

 land that] the method of applying followed by users of this material in this 

 country is most extravagant and \vasteful." 



Statistics of the production of phosphates in 1908, MAiziiiRES (Engniis, 

 23 (1908), Xo. 50, pp. 1189, i/90).— Statistics are given of the production of 

 American and Tunisian phosphates. 



Withdrawal of western phosphate lands for protection of the industry 

 {Amcr. Fcrt., 29 (1908), Xo. 6, pp. 12, 13; Tradesman, 60 {1909), No. 9, p. 

 //.T<s'). — This is a brief statement regarding the phosphate lands withdrawn from 

 entry by the Secretary of the Interior in accordance with the President's order, 

 in Morgan, Rich, and Cache counties, I'tah ; portions of Bear Lake, Bannock, 

 P.ingham, and Fremont counties, Idaho; and nearly all of Uinta County, 

 Wyoming. The lands withdrawn were selected as a result of preliminary ex- 

 aminations by the U. S. Geological Survey, and comprise " in all about 7,500 

 .square miles of land more or less underlain by phosphate rock and constituting 

 the greatest kni-wn phosphate deposit of the world." 



It is stated that 2,205,000 tons of phosphate rock was produced in the United 

 States in 1907, of which 900,000 tons, or about 40 per cent, was exported. It 

 is estimatetl that at the present rate of mining the known available supply of 

 high-grade phosphate rock in the United States will last only 54 years, and if 

 the increase in production shown during the last decade continues the supply 

 will be exhausted in 25 years. 



Florida phosphate deposits, E. H. Sixlards (Farmer and Fruit Grower, 43 

 ( l!>()8), Dec. 25, p. /). — The present state of development of these deposits is 

 briefly reviewed in this article by the State geologist of Florida. 



The phosphates of Tunis, Maizii^kks (Engrais, 23 (1908), No. 51, pp. 1213, 

 121 'i). — This is a brief review of a recent report on the deposits of Djebel- 

 (Jouraya. 



The manufacture of superphosphate, Gkukbkr (Die Huperpliosphatfahrika- 

 lion. Halle, 1901, pp. 83; rev. in Ostcrr. Chem. Ztt).. 11 ( 1908). No. 22, p. 307).— 

 One of a series of monographs on chemical-technical manufacturing methods. 



A test of manganese as a fertilizer, Z. Bonomi (Ann. li. Staz. Spcr. Agr. 

 Vdine. 9 (1908), pp. 52-51!). — In an exiteriment witli hors(> beans all the pots 

 received Tiiomas slag supplying 50 lbs. solulde i)hosi)horic acid per acre, sul- 

 phate of potash furnishing (Mi lbs. oxid p<'r acre, and nitrate of soda at the rate 

 of 27 lbs. nitrogen per acre. In addition alternate pots received sulphate of 



