Ask an Agronomist
Which nitrogen source should I use for sidedressing
Apr 22, 2014
Question: What type of nitrogen do you recommend for sidedress applications in corn?
Answer: For a sidedress application, farmers have a choice in what nitrogen product to apply. Many are asking if there is an agronomic difference between 28% and anhydrous ammonia. At sidedress, as far as the plant’s uptake of the nitrogen, these products will both convert to nitrate for its uptake. The difference between these two is their timing for availability. If you have yellow corn, and you were to sidedress the corn to make it green, the 28% has nitrate, and that turns corn back green faster. With anhydrous ammonia, you create a core and it could be 14 days for the nitrogen to be released from that core. If you are sidedressing green corn, it’ll mineralize back slower and be more stable. Beyond that, if you have enough nitrogen to keep corn green at sidedress, it won’t make a difference which product you use.
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