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Polk City IA | Based on what you have given, the first thing you need to find is a gypsum source. Based on these levels and assuming it is constant across the whole field, you need to spread 2 ton/acre to shock the soil and start flushing out the Mg. Mg causes water infiltration issues due to poor soil structure. If you need some help finding a source, please contact me I can pass on some numbers for you to call. Next your K levels are extremely high. In the near term you need to plant determinate hybrids. Stay away from flex hybrids until you get the K% levels to 5% or lower.
What's your Nitrogen application(s) timing plans right now and planned rates? Assuming you plant a determinate type variety you can put a large majori90% of your N rate in the UAN form (28 or 32) as near to planting as possible. Best way is to apply with the planter in a side band. The objective is to treat every plant the same. The N credit of 40 lbs makes sense in season based on your OM levels.
The infurrow starter will be beneficial in your soils; however be very careful with the salt levels in a 6-24-6 or 10-34-0. You may want to explore other options that eliminate the salt concerns from 10-34-0 derivatives. Also, Zn is a decent start to add to the infurrow; however the plant also needs other nutrients in a more available source at germination.
For future, if you are only doing a composite soil sample or grid sampling move to sampling by soil type. Also, get not only a P1 level but ask for a P2 reading. What's available and what's in the bank??? Need more information to comment on the need for any immediate dry P spreading.
Hope this helps. Feel free to email me if you would like to talk directly.
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Soil test rec?
