398 
The Woburn Field Experiments , 1913. 
cake-fed plot, a result like that above recorded for Series C, 
and also quite contrary to what would have been expected. 
It will be desirable to carry on this experiment to the end 
of the rotation before attempting to explain the exceptional 
results obtained in 1913. 
Green-manuring Experiments. 
(a) Stackyard Field. Series A. 
Green crops were again grown in 1913. On March 26, 
spring tares were drilled at the rate of 4 bushels per acre ; on 
May 17 rape seed at the rate of 5 lb. per acre was sown, and 
on the same day mustard seed at the rate of 1 peck per acre. 
All three crops came up well, and were in due course fed 
on by sheep. The tares were fed from June 28 to July 9, the 
mustard from July 9 to 15, and the rape from July 16 to 21. 
In each case 2 cwt. per acre of cotton cake was given to the 
sheep as well. Second crops of the tares and the rape were 
sown on July 15 and July 26 respectively, but these did not 
come to anything, and so were turned in, a second crop of 
mustard not being sown. Wheat follows on this rotation. 
(5) Lansome Field. 
In 1912 a wheat crop following the green-manuring had 
been taken, and it had been decided that, instead of growing 
green crops again in 1913, a second corn crop following the 
wheat should be taken in order to see whether it would remove 
the residue from the land and show any difference in crop as 
between the ploughing-in of the tares and of the mustard 
respectively. 
Oats were chosen for the purpose, and on February 28, 1913, 
u Banner ” oats, at the rate of 4 bushels per acre, were sown. 
The oats came up well, and, as usual, looked — at first — 
best on the tares plot. Towards the end of April the plots 
turned very yellow in appearance, more particularly the tares 
plot. The crops recovered, however, and the oats were ready 
to cut on August 12, being subsequently threshed on August 
30. The results are given in Table Y. 
From this Table it will be noticed that the differences 
shown were not large. Taking the half of the area manured 
with mineral manures, the oat crop on the tares plot was the 
heaviest, and that after mustard the lowest, whereas on the 
portion where lime had been applied the mustard plot gave 
the best return, and then the tares, the rape being the poorest. 
Taking the average of the two sets of plots, the tares gave, 
on the whole, the highest return, and the mustard about 1^ 
bushels per acre less corn, the rape giving a further bushel per 
acre less. 
