What is anhydrous ammonia primarily used as?

Anhydrous ammonia is primarily used as a high nitrogen content fertilizer. It is composed of approximately 82% nitrogen, making it one of the most concentrated sources of nitrogen available for agricultural use. When applied to soil, anhydrous ammonia is converted to ammonium ions, which are readily available for plant uptake. This high nitrogen content is essential for promoting vegetative growth in crops, making it a popular choice among farmers looking to enhance crop yields.

The other options represent different types of fertilizers or soil amendments that serve specific functions. Potassium-rich fertilizers provide potassium, which is vital for plant processes such as water regulation and enzyme activation. Phosphorus-based soil amendments supply phosphorus, important for root development and flower production. Micronutrient supplements supply essential trace elements that support various physiological functions in plants but are used in much smaller quantities compared to macronutrients like nitrogen. Therefore, the unique characteristics and high nitrogen concentration of anhydrous ammonia make it especially effective and widely used in fertility programs for a range of crops.