Most suitable form of N for flooded rice soil is

Answer: Option A

The most suitable form of Nitrogen for Flooded rice soil is Ammonium.
The absence of oxygen in the soil creates an anaerobic condition and thus promotes the growth of anaerobic microbes.
The flooded soil-rice plant ecosystem is extremely complex and final N budgets are the products of many N transformations modified by physical, chemical and biological agents, to a large extent controlled by oxygen fluxes.