Applying NH3 this fall for 2012 corn crop
The bottom line is this: If anhydrous ammonia is to be applied in the fall, there are a number of factors that must be considered, including soils, temperature, and soil moisture. Consider the following guidelines:
* In general, in central and eastern Kansas, fall applications of anhydrous ammonia for corn should only be done north of I-70. In western Kansas, there are no good general guidelines. However, the drier conditions and cooler soils in western Kansas would suggest that the potential for N losses from fall-applied ammonia should not be as great as in central and eastern Kansas, even south of I-70.
* Do not apply anhydrous ammonia in the fall on sandy soils.
* On silt loam or heavier soils, wait to apply anhydrous ammonia until soil temperatures at 4 inch depth are below 50 degrees (records indicate in most years this will be in November).
* Use a nitrification inhibitor such as N-Serve with anhydrous ammonia to help reduce fall nitrification rates.
* To check the soil temperature in your area visit the K-State Research and Extension Weather Data Library at: http://www.ksre.ksu.edu/wdl/
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