OCR Text |
Show Use Only Pure Chemicals in Treating Grain Seeds Good grades of formaldehyde and copper carbonate must be used in treating seed or the ''smuts of grain will not be cured. Careful treating Is necessary but it is also essential to use good chemicals. Plant disease specialists at university farm say that formaldehyde should be 40 per cent commercially pure. It should be a clear colorless liquid. If it is cloudy or contains a white flakey substance or has been frozen it should not be used for treating seed. It evaporates rapidly and If left exposed to the air becomes so weak that It Is noneffective. noneffec-tive. Copper carbonate dust must contain con-tain a sufficient amount of copper In a form that is sufficiently active to kill smut spores, but not so strong that It will kill the wheat sprouts. Reliable firms manufacture a dust that will serve this purpose. Copper carbonate Is mixed with a "base" that Is fluffy and loose to facilitate proper mixing. Gritty, heavy copper carbonate dust should not be used. |