<P> Many plants engage in symbiosis with microorganisms . Two important types of these relationship are </P> <Ol> <Li> with bacteria such as rhizobia, that carry out biological nitrogen fixation, in which atmospheric nitrogen (N) is converted into ammonium (NH); and </Li> <Li> with mycorrhizal fungi, which through their association with the plant roots help to create a larger effective root surface area . Both of these mutualistic relationships enhance nutrient uptake . </Li> </Ol> <Li> with bacteria such as rhizobia, that carry out biological nitrogen fixation, in which atmospheric nitrogen (N) is converted into ammonium (NH); and </Li> <Li> with mycorrhizal fungi, which through their association with the plant roots help to create a larger effective root surface area . Both of these mutualistic relationships enhance nutrient uptake . </Li>

Type of bacteria that takes the main element in air out for plant use