Experiments upon Wheat, Bar lei/, and Swedes. 315 
exerted a prejudicial effect upon tlie young wheat by " burn- 
ing It. 
Mr. Ruck's experiments (Table X.) upon the Braydon land 
are generally in favour of the addition of superphosphate. It is 
worthy of observation, however, that the good result is in a great 
measure due to the very superior excellence of one plot. This 
being removed from the calculation leaves 5 plots, the average 
result of which only gives 58 lbs. of corn as the increase over 
what had been obtained by nitrate of soda alone. 
The Bibury land (see Table IX.) speaks unequivocally in 
favour of superphosphate as an addition to nitrate of soda. 
These general observations will be borne out by a careful study 
of the accompanying tables. 
Comparison between Winter and Spring Dressings. — Three out 
of the four series of experiments are decidedly in favour of spring 
applications. Mr. Smith, of Bibury, is, however, here again ex- 
ceptional, as is seen by inspecting Table IX. Looking at Earl 
Bathurst's results, it will be observed (Table III.) that 200 lbs, of 
superphosphate and 100 lbs. of the nitrate applied in January 
gave an increase of 101 lbs. of grain per 100 lbs. of nitrate used. 
The same dressing applied on March 25 gave a corresponding 
increase of 148 lbs., while a third plot in which the superphos- 
phate was applied in January, and the nitrate of soda was sub- 
sequently applied in spring, gave the largely increased vield of 
290 lbs. 
VVhen superphosphate has been added to nitrate of soda, I 
have calculated the increase upon the nitrate of soda only to 
make the results comparable with those in which the nitrate 
alone was used, the difference in the results obtained by the use 
of the mixed substances being then clearly traceable to the 
addition of the superphosphate. Next, taking the College results 
(Table XII.), it will be seen that a winter application gave the 
very feeble increase of 89 lbs. per 100 lbs. of nitrate of soda used. 
Unfortunately the result of the duplicate to this plot was lost, but 
every one who inspected the two while growing, was struck with 
the poor effect of the winter dressed portions when compared 
with the beautiful luxuriance of the plots dressed in the spring. 
Two plots, which received 3 cwts. of superphosphate and 1^ cwt. 
of nitrate of soda in the spring, gave respectively an increase of 
416 and 240 lbs. of grain per 100 lbs. of nitrate used. 
Mr. Ruck (see Table X.) obtained an increase of 105 lbs. 
from a dressing with these two substances on February 23. 
Again, calculating the result upon 100 lbs. of nitrate of soda, 
but when the superphosphate was applied in the winter, and 
the nitrate of soda in the spring (April 9), or both substances 
were applied in the spring, the increases, calculated in the 
VOL. VI. — S.S. Z 
