COMPOSTTION ()!• 1 )1:AI N A( ; i; W A ri:K': 



crops. Their growth is ahnost coiuijlcicd l.ctmv ninirKalioii 

 has reached its greatest activity (from tldwcriiiL: limc ^.Il^vanl.>^ 

 the cereals take no more nitrogen tVoiii the xtil). ami hciim' 

 harvested in August or (\irly Scptcinltci-. thcv leave the i^niun.l 

 bare at a time of rapid nitrate formation, thus exposini: it to 

 all the risks of washinu' awav l>v tlu' autunmal raiu>. 



VI. OtHKH C(»NST1TI KNIS oK DllAlNAi.l. W \l 1 i;s. 



Complete analyses of the mineral constituents of the waters 

 draining fi*om the various Broadltalk plots were ma<le at vaiioii> 

 times by the late Dr Voelcker and by Sir Edward Frankiaiid ; 

 these analyses still constitute ahnost our only information as to 

 direct losses of the land by drainage. 



Table LXXXVI. gives an average of the tiv(> analy>e> 

 made during the years 1866, 1867, and 1868. 



Table LXXXVI. — Comj'osition of Drainagr Waters from the BroddbaU: 

 Mlieat Plots, in parts 2)cr million (Dr A. Voclvkrr). Mean of Jive (or 

 fewer) Collections — December 6, 1866; May 21, 1867; Jamcri/ \'^. 

 April 21, a7id December 29, 1868. 



As refjards constituents of 



= .E 



77-4 

 «7-7 

 fiO-1 

 84-6 

 92 -rt 

 110-7 

 99-7 

 87-0 

 83-9 

 96 -« 

 100-1 

 121-6 

 87-6 

 75 -I 



U 



476-1 

 246-4 

 326-0 

 407-6 

 492-4 

 54 s -4 

 4 •_'.■»-!• 

 406-9 

 425-9 



it lia> aliva<l\ 



been noted that practically no niti-ogenous compountU oecm- 

 except tlic nitrates; phosplioiie acid i> 



in drainage watei 



