Question

Why do plants use nitrogen present in the poll ? How is
nitrogen replenished in the soil?
​

Answer 1

Answer:

nitrogen is replenished by rimbozom bacteria in ammonia

Answer 2

Answer:

Nitrogen, present or added to the soil, is subject to several changes, or transformations. These dictate the availability of N to plants and influence the potential movement of NO3--N to water supplies.When developing N programs and evaluating environmental effects, consider nitrogen’s mobility factor in the soil. Sandy soils may lose N through leaching, while heavy, poorly drained soils may lose N through denitrification.Considering the many transformations and reactions of N in soils, there are some major points to keep in mind:

   Although you can add either organic or inorganic N forms to soil, plants only take up inorganic N (that is, NO3--N and NH4+-N).

   One form isn’t more important than the other and all N sources can be converted to NO3--N. Commercial N fertilizers, legumes, manures and crop residues are all initial sources of NO3--N and NH4+-N.

   Once it’s in the plant or water supply, it’s impossible to identify the initial source.

   Nitrate is always present in the soil solution and will move with the soil water.

   Inhibiting the conversion of NH4+-N to NO3--N can result in less N loss and more plant uptake. While it’s not possible to totally prevent the movement of some NO3--N to water supplies, sound management practices can keep losses within acceptable limits.

Explanation: