Soil sample bags are available from the county Extension offices. Turn around time should be just a few days of receiving the samples. The first issue has all the details as well as announcing the revised fact sheet PP-2 Management of the Soybean Cyst Nematode. Moisture Needed to Activate Herbicides - Mark VanGessel, Extension Weed Specialist. The dry weather of the past few weeks could result in poorer weed control from soil-applied herbicides.
Moisture is needed for two reasons.
First, moisture moves the herbicides into the top one to two inches where the herbicide can be taken up by the shoot as it emerges or the roots, depending on which herbicide was used. Second, enough moisture needs to be present that allows the herbicide to be in the soil moisture and is taken up by the plant as it takes up the soil moisture. As a result the herbicides will not provide the level of control that is needed. In that situation, be sure to scout early those fields that were planted up to three weeks ago and determine if a postemergence herbicide may be needed. The chloroacetamides will become activated as soon as there is enough rain or irrigation, but these herbicides do not control weeds that have already emerged.