There are a number of factors to consider if anhydrous ammonia is applied in the fall. Some of these factors include soil texture, soil temperature, and soil moisture. Other factors are discussed in this article from Extension Agronomy.
For fall applications of anhydrous ammonia there are a number of factors to consider including soil temperature, soil texture, and soil moisture. This time of year, it is important to not apply anhydrous while soil temperatures are above a certain threshold. Learn more in this article.