Nitrogen System for the 2017 Corn Crop can begin with Fall NH3
10/24/2016
E-MAIL SHARE PRINT

Fall is a great time to apply a portion of your total nitrogen (N) needs for the 2017 corn crop, Nh3.pngwhere a fall application of anhydrous ammonia is an important management option.  Below is a brief summary of management guidelines that will help insure optimum return for your invested nitrogen dollar.

1.) Determine the right rate of N to apply by utilizing the Maximum Return To Nitrogen (MRTN) N Rate Calculator. The N Rate Calculator is an ONLINE TOOL ​that provides N rate guidelines to consider when determining the rate of N to apply.  The online suggestion is based upon many site-years of data with consideration of the estimated price to be received for the harvested grain, plus the cost of N to be applied, which is why it is called the MRTN. 

2.) Nutrient Loss Reduction Strategies point to right timing of N application in an overall N strategy by planning for each application to be part of the desired total N rate.  Apply 50-60% of the total N derived from the MRTN calculation above followed by spring and late spring N applications as prescribed by N-Watch.

3.) N contributions from ammoniated phosphate fertilizer (DAP/MAP), ammonium sulfate (or thiosulfate), starter fertilizers, manures and/or bio-solids should be included as part of the overall Nitrogen rate to be applied.  Keep in mind that N fertilizers, applied well in advance of plant uptake, are subject to loss.  The use of N enhancements, such as N-Serve, may delay such risks but many N sources (N in DAP/MAP) have no enhancements available and significant losses may occur before plant uptake.

Maximize yield with a strategic “Systems Approach” to N Management by making multiple N applications that follow the 4Rs of N Management (Right source, Right rate, Right time, and Right placement).   Rapid uptake of N into the growing crop is not anticipated until 40 days after emergence.  However, applying all of the plant’s N needs, well in advance of when the plant will utilize the N, adds significantly to the risk of loss.  Managing N as a system, rather than just an application, helps hedge environmental risk that is caused by both an unpredictable environment and the dynamics of N in biologically active soils.

Contact your FS Crop Specialist.​ 

Yes
Yes
Yes
Yes