EFFECT OF WEEDS ON CROPS 
277 
FIELD EXPERIMENT NO. 3 
Ground plowed before seeding; corn planted June 10; hoed 
June 29; cultivated July 12. Measurements and collections made 
August 11. Data submitted in table 5. 
TABLE 5 
CORN — PARTIAL CULTIVATION 
Soil moisture 6.17 per cent 
Designation 
No. OE 
Plants 
Aver. 
Height 
cm. 
Green 
Weight 
gm. 
Amount 
Water Giv- 
en Oee for 
Growing 
Season gms. 
Corn 
2 
162 
Polygonum persicaria (ripe seed) 
4 
31 
20 
1,424.76 
Portulaca oleracea 
2 
5 
9 
631.14 
Digitaria sanguinalis (seed formed) 
1 
76 
55 
3,918.09 
Set aria viridis 
10 
22 
• 270 
19,234.26 
Echinochloa crusgalli (seed formed) 
6 
53 
110 
7,836,18 
. Total for all weeds 
23 
464 
33,054.43 
FIELD EXPERIMENT NO. 4 
Ground plowed before seeding; corn planted June 18 when 
weeds were removed near hills; corn hoed June 29 and July 6. 
tion given in table 7. 
TABLE 6 
CORN — PARTIAL CULTIVATION 
Soil moisture 14.3 per cent 
Designation 
No. OF 
Plants 
Aver. 
Height 
cm. 
Green 
Weight 
gm. 
Amount 
Water Giv- 
en Off for 
Growing 
Season gms. 
Corn — tasseling out ; healthy green 
color 
2 
173 
Portulaca oleracea 
3 
13 
15. 
1,068.57 
Euphorbia maculata 
4 
10 
5 
356.19 
Total for all weeds 
7 
1,424.57 
FIELD EXPERIMENT NO. 3 
Ground plowed before seeding; corn cultivated on following 
days; July 6, July 9, July 31, August 15. Data for full cultiva- 
tion given in table 7. 
The data submitted in the tables show that a crop like corn is 
seriously affected when weeds are grown with it. In field ex- 
periment No. 1 where there was no cultivation, the corn stalks 
