Nitrogen fixation is a general pathway for nitrogen to enter an ecosystem. This might be through bacteria in soil or through lightning and volcanic activity in other places. After fixation, these nitrogen-containing compounds are converted to other compounds through ammonification and nitrificationbefore being assimilated by plants.
Most commercial fertilizers supply nitrogen both as ammonia or ammonium and as nitrate. Yet, plants are much more efficient at taking up nitrate in their roots. What might be a benefit of adding both forms of nitrogen to the soil? Select all that apply.
A. Ammonium is a cation. So if it rains heavily, it well remain in the soil longer than the anion nitrate, which would get washed away.
B. Ammonium is eventually converted to nitrate in the soil, increasing the length of time that nitrate is available to the plants after each application of fertilizer.
C. Ammonium is more oxidized than nitrate, so it is a better substrate for enzymes making amino acids once the plants have taken it up.
D. Ammonium is not used by denitrifying bacteria, so it won't be lost to the atmosphere as easily as nitrate or nitrite.