Report on the Field and Feeding Experiments at Woburn. 135 
It is quite evident that the natural productive powers of 
plot 1 are better than those of the second unmanured plot. 
Plot 7, it may be stated, is situated nearest the road-side of the 
field, and plot 1 is at the lower end of the field, and evidently 
better land than plot 7. Ammonia-salts alone, it will be seen, 
produced a better effect than an equivalent quantity of nitrate 
of soda applied without any minerals, in conformity with the 
results of the two preceding seasons. 
The minerals without ammonia or nitrate of soda on plot 4 had 
a better effect on the produce than in previous seasons ; but, on 
the whole, raised but slightly the produce in corn. Notwith- 
standing the unpropitious season, the addition of 200 lbs. of 
ammonia-salts to the minerals largely increased both the yield 
of corn and straw on plot 5. Thus, 200 lbs. of ammonia-salts 
per acre on plot 2, produced only 756 lbs. of dressed corn, and 
20 cvvts. 2 qrs. 22 lbs. of straw ; whilst the same amount of 
ammonia-salts, with the addition of minerals, on plot 5 yielded 
1480 lbs., or nearly twice as much dressed corn, and 1 ton 
15 cwts. and 26 lbs. of straw. If the weather towards harvest- 
time had been warm, no doubt the produce in corn on plot 5 
would have been much more considerable, for the weight of 
straw and general luxuriant appearance of the wheat-crop on 
plot 5, clearly showed that all that was wanted to insure a heavy 
yield was heat and sun to ripen the crop. As it was, the wheat on 
plot 5 weighed 54^ lbs. per bushel, and was a better sample than 
that on plot 2, manured with ammonia-salts alone, which weighed 
only 51^ lbs. per bushel. 
Nitrate of soda on plot 6, in conjunction with minerals, pro- 
duced somewhat less corn and more straw than ammonia-salts 
and minerals. 
The larger dose of 400 lbs. of ammonia-salts on plot 8, in 
addition to minerals, produced the heaviest crop of dressed corn 
and a large bulk of straw. 
A still larger weight of straw was obtained by the use of 
550 lbs. of nitrate of soda, in conjunction with minerals, on 
plot 9, but it appears at the expense of corn, which gave 4^ bushels 
less per acre in comparison with that reaped oft" plot 8. The 
great weight of 2 tons 6 cwts. 2 qrs. and 14 lbs. of straw per acre 
raised on plot 9 appears to indicate that on light soils heavy 
top-dressings with nitrate of soda, eVen in conjunction with 
minerals, have the effect in bad seasons of producing too much 
straw. The wheat on plot 9, however, it may be stated, was 
not blighted, but only thin. 
Both the application of the more moderate quantity and of 
■double the amount of dung, estimated to contain nitrogen equal 
ito 100 lbs. and 200 lbs. of ammonia respectively, notwithstanding 
