320 Experiments upon Wheat, Barley, and Swedes. 
Appendix I. 
The manures used in the above experiments were analysed in the College 
laboratory by Professor Church. The nitrate of soda was a very pood sample, 
containing nearly 95 per cent, of the pure salt, as will be seen by the following 
statement : — 
Per cent. 
Water 2-62 
Sand 0-11 
Chloride of sodium 2*48 
Nitrate of soda 94-79 
100-00 
Analysis of the Lawes' superphosphate showed its composition to be as 
follows : — 
Per cent. 
Water ' 12-58' 
*Organic matter and water of constitution . . . 15'35 
fMono-calcic phosphate 19 '47 
Tri-calcic phosphate 7'59 
Sulphate of lime 37'47 
Silica .' 4-07 
Alkalies, iron, &c 3'47 
100-00 
These two manures were applied, in four different proportions and combina- 
tions, to the wheat crops experimented upon : — 
Ij cwt. nitrate of soda per acre. 
3 cwts. nitrate of soda per acre. 
Is cwt. nitrate of soda 1 
3 cwts. superphosphate ) acre. 
3 cwts. nitrate of soda 
6 cwts. superphosphate/ ^"^^ 'icre. 
Having thus obtained the analytical data, it is easy to estimate the per- 
centage of the chief elements of plant-food in the manures, which appear in 
the increased yield caused bj'' their api^lication. In the following table Pro- 
fessor Church has regarded the experiments from this point of view, and with 
reference to one manurial element only, namely, nitrogen. The table, for the 
most part, explains itself, but one or two points may be premised. For full 
details as to tlie period and mode of application, reference must be made to 
the earlier portion of this Report, and such circumstances ought certainly to 
be taken into account in examining the leading results of the applications 
of manure used. The last column requires a word of comment, but maj^, 
perhaps, be best explained by taking as an example the first line of the table. 
168 lbs. of nitrate of soda ])er acre gave an increased yield of corn, as the 
average of eleven plots, of 416'5 lbs. This amount of grain contained 8-33 lbs. 
of nitrogen (=2 per cent.), while the manure employed contained 26'1 lbs. 
Thus the proportion of nitrogen in manure to that in the increase of grain may 
be thus represented : — 
26-1 : 8-33 = 100 : 31-9 
* Containing traces only of nitrogen. 
+ Equal 25'79 of bone-earth rendered soluble. 
