184 EXPERIMENTS WITH SPECIFIC MANURES. 



successful, siilpliate of soda the imsiiccessfiil application — I 

 speak here of the substances in the individual application — 

 in mixture; both are successful, and in varying- degrees. On 

 grass, the two succeed well togetlw)', in conjunction with 

 common salt and pigeon dung' ; on oats, the most successful 

 mixture with sulphate of ammonia, is g'uano, nitrate of soda^ 

 and animal charcoal ; and sidphate of soda succeeds best 

 with nig-ht-soil, saltpetre -refuse, and animal -charcoal; on 

 •wheat, sulphate of ammonia succeeds well with nitrate of 

 soda, applied with which substance, sulphate of soda fails ; 

 ■with the former, however, animal-charcoal was conjoined, 

 with the latter, it was not, and hence, probabl}', the success 

 of the one and the failure of the other ; on the potato-crop, 

 sulphate of soda succeeds, while sulphate of ammonia fails ; 

 the experiments in this case, however, are destitute of 

 authority, from their erratic character ; — on the whole, both 

 substances are good in mixture. The facts connected with 

 these substances are demonstrative of the good results attend- 

 ing- widely-extended experiments ; and from them also the 

 lesson may be learned that, before larg-ely using- any manure, 

 it ought to be carefully experimented on. 



Saltpetrc-refme has proved itself a most excellent top- 

 dressing", both in the individual and mixed applications. Nor 

 is it destitute of merit when applied with other substances as 

 a manure to root-crops ; on all, it has exercised a most bene- 

 ficial influence. As a g-rain producer, its value is great in 

 respect of quantity, but it is inferior as regards quality. 

 And in respect of g-rain, it is surpassed in the wheat-crop by 

 nig-ht-soil; besides that, comparing- its produce in straw 

 ■with its produce in g-rain, and both with the produce ob- 

 tained from other specifics, it fails in producing- a (piantity 

 of the latter corresponding- with the amount of the former. 

 In mixture, however, this failing- is corrected, thoug-h the 

 amount of produce in g-rain does not equal, in every case, its 

 own produce, individually applied ; as a set-off to this, it 

 is improved in cpiality. On the whole, this is a valuable 

 manure. 



IMy experiments in n'ujld-soW are most satisfactory, and 

 fully justify the conclusion, that it is a g-ood manure. Pro- 

 bably, in other experiments undertaken this year, the effects 

 of this manure will be sufficienth' broug-ht out ; if so, then 

 a just appreciation of its value may be formed ; if not, I 

 submit that, from the g-ood effects of it recorded in my 

 experiments, its merits demand a more extended inquiry. I 



