Conthnwiix Grow'uuf of Wheat. 
■2ir> 
4. In place of an application of 14 cwt. of rape dust per 
acre (to yield 100 lb. ammonia) one-fourth that quantity only 
is now used (25 lb. ammonia per acre). 
5. Farmyard manure, instead of being put on in quantity 
estimated (as the result of feeding with known foods) to yield 
a certain amount of ammonia, is now, while being made as 
before, analysed when applied, and the actual quantity required 
to supply 100 lb. ammonia per acre is given. This is just 
one-half of what had been reckoned hitherto to be supplied. 
Recent investigations at the farm have shown that in reality a 
considerably less quantity of ammonia was supplied than had 
been calculated to be the case. 
6. Lastly, the plots 10a and 11a (on which rape dust and 
farmyard manure respectively had been used for several years 
and the application then left off for the last twenty years or so) 
were considered to have afforded all the information they were 
likely to give, and the treatment was replaced by using on 
plot 10a, superphosphate of lime 3 cwt. and nitrate of soda 
1 cwt. per acre, and on plot 11a, sulphate of potash 1 cwt. and 
nitrate of soda 1 cwt. per acre. In the former the omission 
of potash, aiid in the latter that of phosphoric acid, might, 
it was thought, bring out information as to whether one or the 
other is essential for corn-growing. 
The foregoing alterations being sanctioned by the Com- 
mittee, they were first introduced in the cropping for 1907 in 
the case of both wheat and barley. 
Continuous Growing of Wheat {Stackyabd Field), 
1907 (31st Season). 
The usual course of cultivation, which has frequently been 
described in detail before, was followed in its main respects. 
There was a change made, however, in regard to the farmyard 
manure used on plot 11b ; instead of being applied as a top- 
dressing about the end of January or early in February, the 
dung was made during the preceding winter (January-February, 
1906), and stored, covered with earth, until wanted, and on 
October 13, 1906, it was ploughed in previous to the sowing 
of wheat. This had been the plan adopted in the earlier days 
of the experiments, but had been given up in favour of applying 
the dung as a top-dressing, the light character of the land 
leading to the belief that the burying of the dung deeply might 
render it less available for use and more subject to loss by 
drainage. The poor crop of 1906, however, induced a return 
to the earlier practice. The actual weight of farmyard manure 
put on was 15 cwt. 1 qr. 14 lb. for the ^ acre plot, or 6 tons 
3 cwt. per acre, this being the quantity, as ascertained by 
analysis, required to supply 100 lb. of ammonia per acre. It 
