With the heat we’ve been experienced in NW Iowa the past few weeks, our crops really started to turn around. This also gave us a chance to catch up with post spraying on soybeans. However, this past week, we were all saturated to say the least. Parts of Osceola and Dickinson counties received close to 10 inches of rain in one week. This has left a lot of fields with standing water and saturated soils. Even though most years at this point in the growing season we are ecstatic when we receive decent shots of rain, this year seems to be the opposite.
This brings up the question, how much nitrogen is left in the soil after experiencing heavy rainfall and saturated soils? Most of the Late Spring Nitrate samples that were taken earlier during sidedress time, were all on the lower side. With all the rain we have had since then, it is a question to have on the mind. It is a good idea to scout your fields later into the growing season to see if nitrogen deficiency symptoms are appearing.
One example is v shaped firing, which starts on the lower leaves. It is also good to take stalk nitrate samples a couple weeks after the black layer appears. It is an excellent way to get a Nitrogen report card for the growing season. I believe this year, just like last year, it will be the year when split applying your nitrogen with some sidedressed or topdressed will pay off big time.
Most of the corn fields around here will more than likely pollinate over the next couple of weeks. Soybeans are currently in the R2 growth stage. Now is a good time to scout for foliar leaf diseases, especially with all the rain that we’ve been receiving. The wet conditions have made it an ideal environment for disease development. In the coming weeks, it will also be important to scout soybean fields for Soybean Aphids.