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FIELD EXPERIMENTS AT WOBURN IN 
1889 AND 1890. 
A. Experiments on Continuous Corn Growing. 
I. Tlie contimious grovth of Wheat.^ 
The years 1889 and 1890 comprised the thirteenth and fourteenth 
seasons of consecutive wheat crops. The variety grown was Bro- 
wick red wheat, 9 pecks per acre of seed being dibbled in by hand, 
Nov. 7-9 in 1889, and Oct. 24-26 in 1890. The .same manures 
have, with the variations mentioned in the table of results, been 
used each year since 1877 on the respective plots. The mineral 
manures were sown on plots 4, 5, 6, 8 and 9 two or three days 
before the seed went in, and the nitrogenous top -dressings of 
ammonia-salts (sulphate of ammonia and muriate of ammonia in 
equal parts) and nitrate of soda were applied in spring (April 
16-17) to the plots 2, 3, 5, 6, 8 and 9, due to receive them. Plots 
I and 7 haA'e been left without manure since the commencement in 
1877, while plot 4 has had only the mineral manures during the 
same period. On plot 11b, farmyard manure at the rate of about 
7 tons per acre was applied early in February. This had been made 
by bullocks in the feeding-boxes in December consuming definite 
weights of food, so that the manure produced might yield the 
estimated amount of 200 lb. ammonia per acre when put on the 
land, and afford thus a comparison with the effect of ammonia applied 
in the form of nitrogenous top-dressings on plots 2, 3, 5, 6, 8, and 9. 
Plot 11a, which last had this same manuring with farmyard manure 
in 1882, has since had none, in order to see how long the effect of 
the application would remain. On plots 10a and 10b the same 
experiment had been tried, but with only a half -dressing (about 
4 tons), of farmyard manure. This amount proving, however, of little 
efficacy, it was decided to try in place of it a material like 
rape-cake, which supplies organic nitrogenous matter to the 
crop. Accordingly, both plots 10a and 10b received on Jan. 23, 
1889 a dressing of about 8 cwt. per acre of rape-cake, this yield- 
ing 50 lb. of ammonia per acre to the land. After this appli- 
cation in 1889 plot 10a was left in 1890 without any fufther 
dressing, but it was renewed on 10b, 100 lb. of annnonia to the 
acre being applied to this plot in 1890. 
The rainfall for the year 1889 was 23'67 inches, almost identical 
with that of the very unfavourable year 1888. May was an ex- 
ceptionally wet month, while both in July and August there were 
II wet days. In 1890 the rainfall was considerably less, viz. 16 "8 
inches, but although April and May were fine bright montlis, there 
' These experiments are for the purpose of showing the effect of different- 
artificial manures, and of farmyard manure, upon corn crops grown year after 
year on the same land. 
