Here is a couple of quick notes on field observations:

Bean fields are starting to show some weeds.  Surprisingly, I am seeing more grass than in the past but generally it is the same list of weeds that is expected.  The bean pre herbicides should start to peter out so this observation is not unexpected.  Now that fields are drying and some spraying can go on, remember if you have not had the chance to spray for volunteer corn, the rate of whatever product you have been using will probably not be enough.  Generally your vol. corn recommendation is for corn that is less than 12 inches tall and the rate needed to control corn above 12 inches is higher than what is normally talked about.  Also, expect your vol corn product to work slower on this taller corn.

Corn fields are for the most part, clean.

Corn fields, as you have noticed, are not the right color.  This is due to the excess rain, but not necessarily due to loss of N as corn will show symptoms similar to N loss in saturated soils.  Here are a couple of good articles that discusses this: http://cornandsoybeandigest.com/fertilizer/estimate-nitrogen-losses-wet-corn-fields?NL=SO-09&Issue=SO-09_20140628_SO-09_749&[email protected]&YM_MID=1473471&sfvc4enews=42&cl=article_2_b and http://www.extension.iastate.edu/CropNews/2014/0617sawyer.htm.

This week there needs to be some discussion on what can be salvaged from the corn fields in regards to supplemental N applications.

Here are a few thoughts about using a cover crop on your acres that have been lost to flooding…

The crop that has been talked about most for use as a cover crop is turnips and/or radish. Both are good choices and have benefits like breaking up compacted soils, retrieving deep nutrients and after the tuber dies, it leaves a wonderful depression within the soil surface that facilitates water infiltration.  One of the major drawbacks of these crops are that they are non mycorrhizal.  A mycorrhiza is a symbiotic association between these natural soil fungi and many crop plants.  This association helps the crop assimilate phosphorus and can be very important to crops like corn when phosphorus becomes less soluble – like in soils that are wet and cool.  A bare soil, or one that has a crop that does not support mycorrhizal associations will have a greater chance of showing ‘fallow syndrome’ symptoms the follow planting season. Being non mycorrhizal is a big deal.  For this reason, planting a turnip or radish cover crop by itself is probably not the best choice but a good choice as a base for a cover.

This is my suggestions: use the turnip/radish crop a small grain such as oats.  This will be one of your most economical choices and you get the advantage of having the turnip/radish as well as a crop that supports mycorrhizal associations.  Adding a legume to the mix (if planting in lost bean acres)  will give some recovery of the lost legume credit for your next corn crop.  There are also mixes available that create a great deal of biomass that can be chopped or baled if needed for forage as well.

A cover crop can be as simple as you need it to be; don’t get caught up in the idea that you mix needs to be some exotic blend of many different species.  Just remember that if you are using a small grain or other patented protected crop that bin running the oats, wheat or other as use in the case could be violated the Plant Variety Protection laws.

One of the suppliers I talked with today told me that if there is a place available, he will supply some seed to create a cover crop plot in order to get some local exposure to the cover crops.  I would like to take advantage of a drowned out spot to do so if anyone is interested allowing so.