300 The Woburn Field Experiments , 1905 and 1906. 
Table X. — G-reen-manuring Experiment (. Lansome Field ), 
1905. 
Plot 
Crop 
Manure 
Green produce per acre 
T. 
c. 
q. 
lb. 
1 
Tares 
Mineral manures 
7 
2 
2 
0 
5 
Mustard . 
5 
10 
1 
0 
2 
Tares 
Lime 
6 
14 
1 
0 
6 
Mustard . 
V ... 
5 
5 
0 
0 
It will be seen that the tares in each case gave the greater 
amount of green stuff. It was considered well to make 
analyses of the tares and mustard as ploughed in. From 
these the following figures may be taken : — 
Tares (green) Mustard (green) 
per cent. per cent. 
Moisture ...... 73’46 . 72'16 
Organic matter .... 24 - 45 . 25‘53 
Nitrogen ...... 1'05 0*46 
Hence the turning in of the green crops added more than 
twice as much nitrogen in the case of the tares as in that of 
the mustard. Nevertheless, as will be seen later, this, as in 
former years, failed to produce as good a corn crop as did the 
mustard. The rape was too small a crop to cut separately, and 
so was turned in direct. Second sowings of tares, rape, and 
mustard were made on July 27, and were ploughed in on 
September 16 (rape and mustard) and September 27 (tares). 
“ Square Head’s Master ” wheat was drilled in, at the rate of 
9 pecks per acre, on October 13, 1905, and came up well. Up 
to April 21, 1906, the wheat after tares looked rather the best 
(this has been noted in former years also), but by June a 
change had come and the wheat after rape was the best, then 
that after mustard, the tares lot being undoubtedly inferior to 
the others. The crop was cut on August 7, carted on August 
16, threshed and weighed on November 14. The results are 
given in Table XI., page 301. 
The corn, when valued, was practically of equal quality 
throughout. 
The highest produce was, once more, obtained from green- 
manuring with mustard, plot 5 (with mineral manures) giving 
the best return ; the rape plots were but little inferior, and 
mustard and rape each gave, on the average, 10 bushels more 
corn than did the tares, in spite of the extra manuring with 
nitrogen which the latter crop supplied. This result affords 
a thorough confirmation of the results obtained- in former 
years, and leaves for solution a very interesting question, viz., 
What is the cause of the apparent disappearance, or, at least, 
