N[TKATKS IN ■mi., soil 



nitrates. Sucli a break in c'()m[)()siti(.ii is ii,,t s.-.-n in the 

 samples drawn from other fields wliidi aiv imi t ilc-draiiu-d. 



The eharacter of the maiun-iii- n|)]>h('il to ihr sinfacc soil i> 

 well seen in the amount of nitrates in the sulisoil : i'nv cxamiile. 

 Plots ;\ (), 7, 8 form a series, all ucttiii.Lr tlic same niinn-al 

 manure, but Plot 5 has no niti-o^en, while Plots (;. 7. and s 

 receive successive increments of anunonium-salts. Down tn 

 the depth of 9 feet the samples contain nitrogen as nitrate in 

 approximately the same proportions as it is applied t.. tin- 

 surface in the form of anunonium-salts. Again, the total 

 amount of nitrogen as nitrate contained in the wln>le de[»th 

 below Plots 6, 7, and 8, as compared with that present below 

 Plot 5 receiving no nitrogen, is nuieh the same as the (piantity 

 of nitrogen applied as manure less the amount renioxed in 

 the crop of 1893. 



Table LXX\X.—Xitro[in), Ik j)er acre, 1893. 



Thus we have evidence that practically the whole of 

 nitrogen supplied as ammonium-salts is nitrified during 

 season of growth of the wheat, and whatever is not iciik 

 by the plant gets w^ashed down as nitrate into the snbsoil, 

 may be either intercepted by the tile drainage, if any. nr 

 its way into the general stock of undei-ground water. Jn> 

 the same w\ay the nitrate supplieil to Plot HI in excess of 

 requirements of the plant gets also \\a>lif(| (l(.\\n lo a e(»n>i( 

 able depth in the subsoil. 



The large quantity of deep-seated nitrate >lio\\ii in 

 analyses is no longer available for crops on the Kothain. 



the 



th.> 



.ve.l 

 and 

 lin.l 

 t in 



thr 



the 

 ^ted 



