68 
Winifred E. Brenchley. 
of that reached by the single sown plants, which were individually 
much better than the double sown. In this case the competition 
of the wheat with the spurrey was less keen than that of spurrey 
with itself. 
Rothamsted Soil. 
TOTAL 
DRY WEIGHTS OF CROPS FROM SIX POTS 
Crop. 
Weed. 
Grams. 
Grams. 
Alopecurus 
33-4 
Alopecurus-f Alopecurus 
93.8 
88.7 
Wheat-}- Alopecurus 
0.1 
85.5 
Wheat 
97.6 
Wheat + Wheat 
66.7 
Wheat + Brassica 
29.0 
Brassica + Brassica 
94.9 
• 
Brassica 
86.1 
AVERAGE DRY WEIGHTS OF SHOOTS. 
Crop. 
Weed. 
Per 
plant. 
Per single sowing. 
Per single sowing. 
Grams. 
Grams. 
Grams. 
Alopecurus 
5.57 
Alopecurus-}- Alopecurus 
7.82 
3.695 
14.78 
Wheat + Alopecurus 
0.02 
3.562 
14.25 
Wheat : 
2.032 
8.13 
Wheat+Wheat | 
2.78 
11.12 
Wheat +Brassica 
4.83 
Brassica + Brassica 
7.91 
Brassica 
14.35 
Wheat and Alopecurus. 
The Alopecurus behaved in rather an abnormal way, possibly 
because it was sown at an unusual season of the year, so that it 
had rather a poor chance. When grown with wheat it practically 
failed—one feeble plant in one pot being the sole representative at 
harvest time. The best plants in every respect were in the double 
sown pots; these were strong and in full flower, and were far 
stronger individually than in the single pots. Alopecurus is not 
unusually an obnoxious weed except on certain heavy soils where 
for any reason it is difficult to clean the land well in autumn, or 
between two cereal crops. The seed ripens at the same time or 
