![]() The bottom line is that, with corn rooting to about three feet deep, about five to six inches of drainage are required before nitrate-N is lost “out the bottom,” and this is not likely to have occurred yet. While primarily qualitative in nature, observing tile outlets can give you an idea of how much water has been drained. This means that a system flowing at capacity will require two days to move an excess inch of water. However, a significant portion of excess rainfall will run off (runoff is not a significant loss pathway for N).Īnother general rule of thumb is that drainage systems across southern Minnesota are typically designed with a half inch drainage coefficient. A good question to ask yourself is: how much rainfall did I receive beyond the point of soil saturation? This will give you a rough idea of how far your nitrogen moved down in the soil profile. ![]() Nitrate leachingRates of nitrate leaching vary based on soil conditions, but a general rule of thumb is that nitrate moves about 6 inches down in the soil profile for every inch of drainage in fine textured soils. The extent to which spring urea has converted is largely a factor of how much time has passed since application and this past weekend’s rains. Spring anhydrous applications are probably largely still in the ammonium form. Anhydrous applications will have less conversion, but still a significant amount due to the amount of time that has passed since application, allowing for the inhibitor to degrade. The extent to which applied fertilizer has undergone this transformation varies based on application practice and local conditions.įall applications of anhydrous ammonia that did not use a nitrification inhibitor will be largely converted to nitrate by now. The conversion of N to nitrate is biological in nature, and is therefore time and temperature dependent. The two primary loss pathways are leaching and denitrification, both of which happen when N is in the nitrate form. The primary N loss processes are water based and occur when the soil is saturated, a condition that is widespread across southern Minnesota right now. RE: Southern Minnesota Northern Iowa Rain totals - WaterburyTwp.Recent heavy rains have many farmers questioning the fate of nitrogen (N) fertilizer that they applied for this year’s crop.RE: Southern Minnesota Northern Iowa Rain totals - Iowegian : 07:05.RE: Southern Minnesota Northern Iowa Rain totals - OutdoorMan : 00:16.RE: Southern Minnesota Northern Iowa Rain totals - paul the original : 22:58.RE: Southern Minnesota Northern Iowa Rain totals - eastndfarmer : 06:22. ![]() RE: Southern Minnesota Northern Iowa Rain totals - bigcorn02 : 22:42.RE: Southern Minnesota Northern Iowa Rain totals - rich79 : 22:35.RE: Southern Minnesota Northern Iowa Rain totals - assault : 21:40.RE: Southern Minnesota Northern Iowa Rain totals - KS.Otisco : 21:27.RE: Southern Minnesota Northern Iowa Rain totals - indeeppigfarmer : 22:12.RE: Southern Minnesota Northern Iowa Rain totals - Schuerman Farms : 21:07.Southern Minnesota Northern Iowa Rain totals - F350 : 20:54.Posted 06:22 (#10229616 - in reply to #10229473) Subject: RE: Southern Minnesota Northern Iowa Rain totals Southern Minnesota Northern Iowa Rain totals
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