HORTICULTURE

Detailed explanation-1: -Rhizobium bacteria are soil microbes that can transform atmospheric nitrogen into a dissolved compound. Rhizobium bacteria are found in the root nodules of woody plants.

Detailed explanation-2: -The oxidation process of ammonia to nitrite and then to nitrate is known as nitrification. The process by which nitrate reduces to nitrogen is called denitrification. Bacteria such as Nitrosomonas and Nitrococcus oxidize ammonia to nitrite, and nitrite is oxidized to nitrate by Nitrobacter.

Detailed explanation-3: -Denitrifying bacteria, also known as nitrate-reducing bacteria (NRB), refers to a group of bacteria that helps to convert nitrates or nitrites into nitrogen-containing gases. This conversion is crucial for the atmosphere. It completes the nitrogen cycle by recycling nitrogen into the atmosphere.