FERTILIZERS. 



299 



"It is practicable for the farmer to ascertain the needs of his soil as regards fer- 

 tilizers by means of comparatively simjde and inexpensive held experiments and 

 thus to avoid wasting money in the nnueccssary purchase of artificial fertilizers." 



Commercial fertilizers and chemicals, li. T. ZSTesbitt and G. F. 

 Payne [Georgia Dept. A(jr. Bui. SjJ, pp. 132). — This bulletin iucludes 

 the text of the laws governiug^ the inspection, analysis, and sale of 

 commercial fertilizers, cbemicals, and cotton-seed meal in Georgia, with 

 rules and regulations prescribed by the Commissioner of Agriculture 

 under the provisions of the laws; tbe report of the state chemist, 

 including notes on the valuation of fertilizers, an explanation of terms 

 used in fertilizer analj'sis, home -mixing of fertilizers, preparation of 

 composts, and fertilizers from the farmers' standpoint; an article on 

 fertilizers in Georgia during tbe year 1890; and tabulated analyses and 

 valuations of 72G sami^les of mixed fertilizers, potash salts, natural 

 l^liosiihates, gy])suin, and cotton-seed meal; besides articles on other 

 subjects noted elsewhere (pp. 308, 331). Tbe average composition of 

 fertilizers sold in Georgia during the years 1874-'96 is shown in tbe 

 following table: 



Average composition of fertilizers sold in Georgia, 1874-96. 



Questions of manuring in the light of "Wagner's researches, P. Tiiiele {Fiih- 

 Ung's hiiidw. Ztg..4o (1S9G), Xos. 13, pp. 407-114; 14, pp. 446-451). 



The relation of barn manures to soil temperature, J. Troop {Indiana Sfa. Bpt. 

 lS9f), pp. IS, 19). — Observations with soil thermometers at a depth of 4 in. in 

 mimannred soil and in soil which had received a spring application of 25 tons of 

 barnyard manure gave the following average results during 10 days: Ou the 

 manured plat 70.6^ F. ; on the uumanured plat (55.7^. 



The nitrogen and green manuring question, O. Stillich (Fiihling's landw. Ztg., 

 45 ilSOG), Xos. 10, pp. 311-319; 11, pp. 344-333; 12, pp. 3SJ-388; 13, pp. 420-424; 15, 

 pp. 476-480; 17, pp. 349-333; 21, pp. 672-673). — An aeeonut of the historical develop- 

 ment of our present knowledge of the sources of nitrogen for jilauts. 



