1920] SOILS FERTILIZERS. 817 



the Cherokee field, acid phosphate used with lime gave increased yields, while 

 finely ground rock phosphate with lime on an average yielded less than did the 

 use of lime alone. 



At the Iredell farm, as an average of nine years' results, acid phosphate gave 

 greater returns than rock phosphate when both were used (1) with nitrogen 

 and potash and (2) with stable manure. On another field at the Iredell farm 

 acid phosphate in a complete fertilizer mixture for a period of 10 years gave 

 greater net returns above cost of materials applied than 500, 1,000, 1,500, 2,000, and 

 3,000 lbs., respectively, of rock phosphate per acre once per rotation just before 

 turning into the soil the second crop of clover. In the same test the use of 

 4,000 lbs. of rock phosphate per acre applied once every three years jrlelded 

 greater net returns than acid phosphate in a complete fertilizer applied annually. 



At the Edgecombe farm, acid phosphate used with nitrogen and potash and 

 with stable manure produced larger net returns over a period of 10 years than 

 four times the same amount of rock phosphate used (1) with normal amounts 

 of nitrogen and potash and (2) with stable manure. 



It is concluded that acid phosphate is generally a more profitable carrier of 

 phosphoric acid than finely ground phosphate rock when used under most crops 

 grown on the main soil areas of the State. It is pointed out. however, that 

 large applications of rock phosphate applied broadcast at 3-year intervals in 

 crop rotations which include suitable green manuring appear to be advantageous 

 treatments. 



The value of raw phosphate in agriculture, W. V. Kniebiem {Deut. Landw. 

 Presse, 47 (1920), No. 48, pp. S45, 3^^).— The author reviews a number of ex- 

 periments on the fertilizing value of raw rock phosphate on different soils with 

 different crops. 



Ir was found that phosphorite meal showed practically no fertilizing action 

 on lowland moor soil rich in basic matter, except in cases where free sulphates 

 existed which acted on the phosphorite. It is concluded that raw phosphate 

 can be used to advantage only on upland moor soils, and then only after it has 

 been composted with sulphates and peat litter or smelted with lime, sand, and 

 soda. 



Preliminary report on potash exploration in New Jersey greensands, 

 G. R. Mansfield {Ann. Rpt., Dept. Conserv. and Development, N. J., 1919, pp. 

 99-104). — The general geology of the New Jersey greensand beds is described. 



The fertilizer situation, M. Whitney (Chem. and Metall. Engin., 22 (1920), 

 No. 22, pp. 1021-1023). — This is a general review of the fertilizer situation in 

 which the present tendencies of the fertilizer industry are discussed, with par- 

 ticular reference to the recovery of the phosphoric acid in the waste rock 

 phosphate of the acid phosphate industry. Other features of the situation, 

 including the theory of fertilizer use and the solution method of applying con- 

 centrated fertilizer salts, are also considered. 



1920 yearbook of commercial fertilizer {Tearbook Com. Fert., 1920, pp. 

 S24, figs. 64)- — This yearbook contains a list of fertilizer manufacturers and 

 directories of allied trades, together with data on cottonseed-oil mills, agri- 

 cultural experiment stations, oflScials in charge of State fertilizer laws, and 

 fertilizer machinery, materials, manufacturers, and dealers. A number of 

 special articles on the subjects of fertilizers and soil fertility are also included. 



Official fertilizer analyses, 102O, R. E. Rose and G. Hart {Pla. Quart. 

 Bui. Agr. Dept., 30 (1920), No. 5, pp. 18-81).— This section of this bulletin con- 

 tains results of actual and guarantied analyses of 31 samples of fertilizers 

 and fertilizer materials collected for inspection in Florida during the second 

 quarter of 1920. 



