Rond Goldy, of the Michigan State University Extension, explained how pre-emergent herbicides can effectively control early season weed problems in a report published by the university this week.
The report noted that such applications are more cost-effective versus alternative solutions. It went on to explain that applying herbicides creates a chemical barrier at the soil surface which may require various methods of incorporation.
In the article, Goldy said:
Tilling the soil too deeply will dilute the product or get it into the root zone of the crop, causing potential crop damage. Similarly, too much water can move the product into the root zone of the economic plant. Properly maintaining this barrier is important for good weed control. Once the barrier is established, it should not be disturbed through other activities such as cultivation. The effective life of the barrier varies with the product, soil type and the population of the soil microorganisms responsible for breaking down the product.
For more information, visit the Michigan State University Extension.