The solubility of nitrogen in water (at 1.013 bar and 0 °C (32 °F)) is 0.0234 vol/vol.
Solubilty of gases in water increase when the temperature decrease, For nitrogen you can see an infographics at this link.
By lightening and by nitrogen fixing bacteria in the roots of certain plants (eg the legumes).
Nitrogen cycle is conversion of air nitrogen to soluble form of nitrogen and then back to air nitrogen. Lighting is part of nitrogen cycle. When an animal dies and the body decays the nitrogen in many forms in the animal body reached back to the place where it came from.
Nitrogen gas composes 70% of the atmosphere but because it is so stable it remains a gas and unusable to plant. Bacteria have evolved that can break the N2 bond and provide nitrogen as a soluble product to the roots of plants. Once taken up by the plant the nitrogen moves through the food chain to animals etc.
Nitrogen is the nutrient that may be fixed in plant roots. What happens is the presence, but unavailability, of nitrogen in the environment. In the case of the ground below surface level, nitrogen must be in soluble form in order to be used by the plant. Nitrogen fixing bacteria and nematodes may do this job on, in or around plant roots.
no its not
Generally speaking, methane gas can be "soluble" in liquid nitrogen if it was bubbled into it. Liquid nitrogen is cold enough to liquefy methane gas, and the liquid methane would then be miscible in the liquid nitrogen.
Nitrogen
Urea
Alga
Ammonia
Conversion of Nitrogen gas into Nitrates\Ammonia.-When Lightning strikes the nitrogen in air get converted into Nitrogen Oxides and then is brought down by rain in from of Soluble Nitrates.These Nitrates are the soluble form of nitrogen for plants. Though lightning play a minor role in nitrogen fixation.-Nitrogen is also fixed by Microorganisms which are free-living or the organisms that live in the plants (Symbiotic relations).These Organisms convert the nitrogen in soluble nitrates.-Nitrogenous Fertilizers are also one from of Soluble nitrogen.*** These Nitrates and ammonia fertilizers are then consumed by plants and the plants are consumed by us.Hence Nitrogen is in the Biotic Part of the Ecosystem.
Nitrogen Fixation Bacteria are the primary source in which Nitrogen Fixation is carried out. The bacteria changes N2 (unreactive element) into nitrogen compounds, which are soluble and can be absorbed.
Solubilty of gases in water increase when the temperature decrease, For nitrogen you can see an infographics at this link.
Nitrogen has a number of physical properties. Some of these include a colorless appearance, odorless, tasteless, as well as soluble in water.
I think its the soluble form of nitrogen
This is because the particular form of nitrogen found in air “nitrogen gas“ cannot be assimilated by most organisms. For example, “Nitrogen nutrients are water-soluble and as a result they are easily drained away”, so that they are no longer available for plants.