EEMOVAL OF LLMK L\ 1 )KA1 N ACi: W ATi:i:s SM 



suil taken at various intt'i-vuls l>L't ween ISO,") and \\h\\ iiKlicaie 

 that on the unmanured plots tlie nonnal l(».s ol calciiim 

 carbonate in the drainage water aiiumiits to aliout looo ll..s. 

 per acre. When aniinoniuni-salts are used as a manurf. the 

 loss is increased by the amount re(|uired to eoinl)iiif with tlie 

 combined acid in the manure. Tlie calcium carbonate. In.w- 

 ever, which is required for nitrification, gets returned lo thr 

 soil by the growth of the plant itself, and by ilu- decay ot 

 calcium compounds in the crop residues. 



Hkkkhk,N( ES 



•' On Nitrification " (R. Warington). Trans. Chew. S,„:, 33 (1S7S). J I. 



"On Nitrification," Part II. (U. Warington). Trans: (hem. Sue., 35 (1879). 



429. 

 "On Nitrification," Part III. (R. Warington). Trans, ('hem. S,,,-.. 45 (lSS4), 



637. 

 *' On the Distribution of the Nitrifying Organisms in the Soil " (R. Warington). 



Trans. Chem. Sue., 51 (1887), US. 

 "On Nitrifieation/' Part IV. (R. Warington). Trans, ('hem. .Sor., 59 (IsOl), 



484. 

 •' On the Amount and Composition of the Rain and Drainage \N .iters cnl- 



leeted at Rothamsted." Jour. Roi/. Ag. .S'oc, 42 (1881), L'41 and ".11 : 



and 43 (1882), 1. Rothamsted Memoirs, Vol. \'., No. 18. 

 •• Determinations of Nitrogen in the Soils of some of the Experiment.il 



Fields at Rothamsted, and the bearing of the Results on the (Question <>f 



the Sources of the Nitrogen of our Crops." Report of the .\meriean 



.Association for the Advancement of Science, 1882. Rothamsted .Memoirs, 



Vol. v., No. 19. 

 "On the Productive Powers of Soils in Relation to the Loss of Plant -fcM.d 



by Drainage" (A. Voeleker, Ph.D., F.R.S.). Jonr. Chem. .So... 24 



(1871), 276. 

 ••'Six Lectures on the Investigations at Rothamsted Experimental Station. 



delivered under the provisions of the Lawes Agricultural Trust, by R. 



Warington, F.R.S., before the .\.ssociation of American .Agricultural 



Colleges and Experiment Stations, at Washington, D.C., .Aug. 12- Is. 



1891." Experiment Stati<.n Bulletin. No. 8, I'nited States Department 



of Agriculture. 



