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N holding capacity with N serve on mid to lower CEC soils
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GOOSEPILOT
Posted 2/13/2021 10:43 (#8829018 - in reply to #8824224)
Subject: RE: N holding capacity with N serve on mid to lower CEC soils


WC Mn/Dakotas
Cec and how deep those soils are plus o.m. can act like 200-400 cec per percent determines how much you really can hold. Do you have a high water table or have periods of saturated soils longer than 24 hours? That would reduce holding or increase risks. Your getting alot of moisture so responses from arid areas don't apply near as well to you.

If you apply early your at risk when it converts to no3. Soil temperature and ph will determine the speed of conversion. AA has to go through 1 more step to get to no3 and an inhibitor prevents that process from starting for a period of time. So those would help delay the earliest no3 period.

80% ish of n is taken up after v6ish. 40% is taken up after tassel. 20-30% after brown silk. If a bulk of moisture and potential excess moisture (saturated soils) happens early, why risk all your n? But don't want to get caught if it's too wet to get into fields to side dress or top dress either.

ESN pre plant would be another way to have n not be at risk earlier. It releases at rates that better match corn uptake needs if it's handled properly so coating is not damaged. Here we blend a percentage of n as esn with urea and ams if guys are not going to split apply. Guys that split apply have been using 28% as carrier with pre herbicides and put about 25-30% of total down then sidedress the balance vrt.

The nice thing about split n is you can wait and see how corn comes up and gets started and, then determine yield goals and risks and adjust rates up or down accordingly. 100% pre your assuming alot of things will happen just right.
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