LOSS OF MTKWTKS \\\ l»i:\INA(;K 



spring, as is now more m'luTally ihc ca^i'. ilic l.)»c> ol' nil r.ii cs 

 are very much reduced; nt»t only is ilic tcuiiMTutiin' ol" tlir soil 

 lower, so that nitritieation lako place inure slowly. I.iit the 

 growing crop both diniinislies ihe juMc.ilalion and i.ikr> iqi ilie 

 nitrates as fast as they are produc-ed. Tlie li^ures. liouever. 

 for Plot 7 and Plot 9, Table LXXXII., show some ris.- in il.r 

 concentration of the drainage wMvv in (he earh s|)rin'_;. follow- 

 ing the application of manure. 



By combining the figures obiained for the eoneenliaiinii of 

 the water flowing from the Broadltalk field dr,nn> witli ilh- 

 amounts of water percolating through tlie drain-gauue eon 

 taining 60 inches of bare soil (see p. '22), an estimate can 



Table LXXXV. — Nitrir Nitroncn in Draliiri/jc JFatrr. Lh. ]hr tirtr. 



be formed of the losses to the land l»y drainauv iindci- ce h 

 sy.stem of manuring, an estimate rendereil erroneous beeau-e 

 it does not take into account the drying effect of the crop. 

 However, the figures thus obtained, tlioiigli iinperfeci. are 

 i Instructive, and are set out in Tabic LXXW. for two year.s, 

 each divided into two periods; liist, from tlic dale <.f >owiiig 

 the nitrogenous manures u[) to harvest ; .seeondly. fiom harvest 

 round again to the sowing of the manures in sJ)rill.u^ 



The sea.sons were rather exceptional, the summei- rainfall 



