6 4 
Winifred E. Brenchley. 
Little Hoos Soil. 
TOTAL DRY WEIGHTS OF CROPS FROM SIX POTS. 
Crop. 
Weed. 
Grams. 
Grams. 
Alopecurus + Alopecurus 
90.6 
126.0 
Wheat + Alopecurus 
13.0 
125.6 
Wheat+Wheat 
74.9 
Wheat + Brassica 
30.5 
Brassica + Brassica 
49.1 
AVERAGE DRY WEIGHTS OF SHOOTS. 
Crop. 
Weed. 
Per 
plant. 
Per 
single sowing. 
Per single sowing. 
Grams. 
Grams. 
Grams. 
Alopecurus + Alopecurus 
7.55 
5.2 
21.0 
Wheat + Alopecurus 
2.17 
2.618 
10.47 
Wheat + Wheat 
3.12 
12.48 
Wheat + Brassica 
5.08 
Brassica +Brassica 
4.091 
Wheat and Alopecurus. 
The results were exactly similar to those obtained in the 
earlier experiments. When the two plants were associated there 
was a very heavy drop in the weed crop, while the wheat practically 
doubled its weight. ‘The height of the Alopecurus was less and 
that of the wheat was much the same when associated than when 
alone. 
Wheat and Brassica. 
The results recalled those of Experiment 1. As a matter of 
fact, both wheat and weed did rather better when they were 
associated than when they were subjected to the competition of 
their own species, the average dry weights of both wheat and brassica 
being somewhat higher in the mixed pots than in those with pure 
cultures. It is evident that in soil which is favourable to both these 
plants the competition between them is very even, that given equal 
numbers of plants the growth will be fairly equal however the 
pecies are combined. The wheat is not so well able to overpower 
the Brassica and reduce its growth as it is in the case of the other 
weeds tested—poppy, spurrey and Alopecurus. Consequently, if 
