J.H. 



Gdbert—P 



inls in connec 



Hon W 



th Vegetation. 23 



of the minor 



aqueous de 



posits than it 



is in 1 



ain ; and there can 



be little doubt that th 



re would he 





ammonia deposited 



from them w 









of soil, than on an 





f the non 



porous even 







How much, h 



owever, wo 



uld thus be a 



vailal. 



e to the vegetation 





rea beyond 



that detern 





the collected and 



measured au 





its, we have 



lint ti 



e means of estimat- 



ing with an) 



certainly. 



On the otl 



er han 





pendent dete 





by both Dr. 



Voelckcr and Dr. Frank- 



land, of the n 





the drainage 





collected from land 



at KuThanisted which had been many 





unmanured, lead to 



the conclusio 



1 that ther 



m av In- a e, 



nsiderable annual loss of 



nitrogen by the soil in that way. 









litroqen der 



ved by crops 0/ 



dipr, 



nt kinds when grown 



uithont yuan. 



re.— The 



ext point U 





der is, what is the 



amount of n 



ltrogen an 



iu ally obtair 



ed ov 



r a given area, in 



different crop 



s when they are grown 



witho 



it any supply of it 





This point may be i 



lustrated bv the results 





the field 





on M 



r. Lawes' farm at 



Eotliamsted, 



which have 



now been in 



pi-ogn 



ss for about a third 



Table II.— Yield of Nitrogen 



per acre, per an 



,,,„. in 



Wheat, Barley, and Root 



„.„.., 





CEL [SS 



Hoot J 

 Crop, | 



f 



12 yrs. 1852-'63 

 12 yrs. 1864-"?5 

 24 yrs. I852-'75 



I; 



{ 

 Complex Mineral Manure j 



^n— j 



1 



fTurnipa .- 



Pill 



Mineral I j Turnips 



