328 
mixed with them considerable quantities of weed seed and other im- 
purities, which, scattered on the land, means weedy fields and reduced 
crops. Many lawns are excessiveiy weedy because of impure seed scattered 
on them. 
THE INJURY WEEDS DO. 
Indiana farmers are losing many hundreds of thousands of dollars 
each year because of the weed situation existing in this State. A con- 
tinuous and strenuous effort to control weeds ought to be made, because— 
Vervain. 
Mayweed or Dog Fennel. 
Catmint 
Night Flowering Catchfly. 
we Cobo 
1. They rob crops of plant food and moisture. Plants feed as really 
as do horses or cattle. As growing crops remove plant food from the soil, 
the farmer must count on the necessity of returning an amount of plant 
food to the soil at least equal to that removed, if he expects to continue 
to grow crops abundantly and profitably. Weeds require approximately the 
same kinds of plant food as do farm crops, and they require them in 
approximately the same amounts. Crops suffer when weeds use up a 
large share of plant food. To put this plant food into the soil the farmer 
expended money, time and labor. Further, an adequate supply of moisture 
in the soil is indispensable for the successful growing of crops. Weeds, like 
