Question

Which of these increases the nitrogen compounds in soil?

Answer 1

The process that increases the nitrogen compounds in soil is nitrogen fixation. Nitrogen fixation is the process by which nitrogen from the atmosphere is converted into nitrogen compounds that can be used by plants and other organisms.

Answer 2

Leguminous plants are known to increase the nitrogen compounds in soil through a process called nitrogen fixation. These plants have a symbiotic relationship with nitrogen-fixing bacteria in their root nodules. The bacteria convert atmospheric nitrogen into ammonia, which is used by the plant to build proteins and other nitrogen-containing compounds. When the plant dies, the nitrogen-rich organic matter is returned to the soil, providing a source of nitrogen for other plants. Therefore, the presence of leguminous plants in soil can improve soil fertility and productivity.

Answer 3

There are several factors that can increase the nitrogen compounds in soil:

Nitrogen Fixation: Certain types of bacteria, such as rhizobia, have the ability to convert atmospheric nitrogen (N₂) into forms that plants can use, a process known as nitrogen fixation. Leguminous plants, such as peas, beans, and clover, have a symbiotic relationship with these nitrogen-fixing bacteria, and their presence can increase the nitrogen compounds in the soil.

Organic Matter Decomposition: When organic matter, such as plant residues or animal waste, decomposes in the soil, nitrogen is released as ammonium (NH₄⁺) ions. This ammonium can then be converted into other nitrogen compounds by various soil microorganisms.