I have little experience with top dressing corn but here is some comments from my counterpart in Manitoba who deals with it regularly...
Hmm this is interesting. We would never use granular as a broadcast with corn, reason being soon as corn gets a few leaves it serves as a funnel, which directs even small amounts down into the growing point which will burn it and cause consider damage to the emerging leaves. This can occur with UAN unless drop nozzles are used to direct it below the leaves to the soil.
Here in Southern Manitoba, with corn, most of the post emergent N is applied with coulters or shanks between the rows not broadcast. NH3 is still the product that is likely most commonly used. In Manitoba because we have generally a dry climate, even when very high nitrogen rates applied early in the spring (150 lbs ) there is not much risk of leaching or N loss as may occur in wetter regions like Ontario. For this reason, less and less producers are using post emergent nitrogen application at all.
Hmm this is interesting. We would never use granular as a broadcast with corn, reason being soon as corn gets a few leaves it serves as a funnel, which directs even small amounts down into the growing point which will burn it and cause consider damage to the emerging leaves. This can occur with UAN unless drop nozzles are used to direct it below the leaves to the soil.
Here in Southern Manitoba, with corn, most of the post emergent N is applied with coulters or shanks between the rows not broadcast. NH3 is still the product that is likely most commonly used. In Manitoba because we have generally a dry climate, even when very high nitrogen rates applied early in the spring (150 lbs ) there is not much risk of leaching or N loss as may occur in wetter regions like Ontario. For this reason, less and less producers are using post emergent nitrogen application at all.
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