The number of weeks your baby was premature: 6 weeks. Subtract the number of weeks premature from the chronological age: 20 weeks minus 6 weeks equal 14 weeks. 14 weeks is your baby's adjusted age.
The use of chemical fertilizer containing anhydrous ammonia can lead to exposure. Outdoor exposure to high levels of anhydrous ammonia can result from leaks and spills at production plants and storage facilities, and from pipelines, tank trucks, railcars, or ships and barges that transport ammonia.
From 2009 through 2015, anhydrous ammonia had an average price equal to $.45 per pound of actual nitrogen (N). This $.45 price was lower than the prices for urea ($.54 per pound) and liquid N ($.61 per pound). From 2009 through 2015, nitrogen prices averaged less in the fall than in the spring. Often, applying anhydrous ammonia in the fall is one of the lowest cost methods of placing nitrogen on fields.