._‘ I I  
_ A 26 Bulletin N0. 1.47. - . · e
dew. A very small quantity of the sulphur dissolved, `n the
, presence of lime renders it more effective both as an iikecti- V
T cide and as a fungicide.   - _ l
V HERBICIDES. L L
u Attention has of late been directed towardfinding a sub-   Q
, stance that will destroy weeds quickly and leave land in a {
` i condition for crops. For many years common salt has been ,  
employed along walks and elsewhere to kill. weeds, and can l
‘ be made to do service in this direction if used in sufficient §_
quantities, but always leaves the soil for some time unsuited  
T to the growth of plants of any sort. I have tried it in ex- i
_ ‘ cessive quantities for broom-rape of hemp an_d tobacco, and
found it would keep the pest from growing one year, but
also prevented the growth of hemp. The next year hemp
grew well enough, but the seeds of the parasite left in the
l ground had apparently not been afected by the salt, and pro-
duced as many broom-rape plants as before. Crude carbolic
acid is another cheap herbicide that can be employed with
4 good effect in the destruction of weeds having strong roots i
from which new shoots appear whenthe tops are destroyed.  
Burdock, curled dock, woody plants, such as persimmon and  
_ sassafras, may all be killed by it.  
The great practical difficulty in destroying weeds quickly T
over large areas comes from the fact that cultivated plants *
are like weeds in their susceptibilty to injury, only are less T
’ hardy and as a result are in general more likely to be
severely injured by herbicides than are the weeds. For
a long time to come, in all probability, it will be necessary to
adhere largely to the old-fashioned methods of keeping weeds ·
in subjection—namely, careful cultivation, rotation, and
watchfulness and the prompt recognition and destruction of
troublesome weeds when they appear. i -
. IRON SULFATE. A 5/
This by-product has recently been tested by us on a
large number of common weeds, with very various results. '
ri