About 190 million tons of nitrogen fertilizer is used in the United States by farmer to increase the productivity of crops.
<h3>What is fertilizer?</h3>
The term fertilizer refers to a material that is added to the soil to improve the fertility of the soil so that it can be able to better support the growth of plants. There are so many kinds of fertilizer that are in use.
The nitrogenous fertilizers are the ones that contain nitrogen. About 190 million tons of nitrogen fertilizer is used in the United States by farmer to increase the productivity of crops.
