Grab a coffee, here is a 10 minute dummied down nitrogen thingy
Below is a snippet that explains how to get nitrogen from the air and to the plant, but it only really becomes effective once brix is up to supply adequate exudates.
The last paragraph refers to cover crops.
Healthy high brix plants sequester both nitrogen and carbon.
Everyone has heard of the carbon cycle, and if you spend a couple hours really studying it your organics will improve.
There is also a Nitrogen Cycle that is equally important but most people have no idea it exists and have never heard the term Nitrogen Cycle.
Thats because selling nitrogen is an extremely lucrative business, but if you understand both cycles you quickly see how good compost and some soil carbon/nitrogen to prime the pump and get brix up creates free carbon and nitrogen inputs.
I prefer fish ferts for my soil nitrogen. It has the most traces in it. If you are going to add nitrogen why not add the best nitrogen.
The snippet:
"Many microorganisms fix nitrogen symbiotically by partnering with a host plant. The plant provides sugars from photosynthesis that are utilized by the nitrogen-fixing microorganism for the energy it needs for nitrogen fixation. In exchange for these carbon sources, the microbe provides fixed nitrogen to the host plant for its growth.
One example of this type of nitrogen fixation is the water fern
Azolla’s symbiosis with a cyanobacterium
Anabaena azollae.
Anabaena colonizes cavities formed at the base of
Azolla fronds. There the cyanobacteria fix significant amounts of nitrogen in specialized cells called heterocysts. This symbiosis has been used for at least 1000 years as a biofertilizer in wetland paddies in Southeast Asia. Rice paddies are typically covered with
Azolla “blooms” that fix up to 600 Kg N ha-1 yr-1 during the growing season (Postgate 1982, Fattah 2005).
Another example is the symbiosis between actinorhizal trees and shrubs, such as Alder (
Alnus sp.), with the actinomycete
Frankia. These plants are native to North America and tend to thrive in nitrogen-poor environments. In many areas they are the most common non-legume nitrogen fixers and are often the pioneer species in successional plant communities. Actinorhizal plants are found in many ecosystems including alpine, xeric, chapparal, forest, glacial till, riparian, coastal dune, and arctic tundra environments (Benson & Silvester, 1993).
Even though the symbiotic partners described above play an important role in the worldwide ecology of nitrogen fixation, by far the most important nitrogen-fixing symbiotic associations are the relationships between legumes and
Rhizobium and
Bradyrhizobium bacteria. Important legumes used in agricultural systems include alfalfa, beans, clover, cowpeas, lupines, peanut, soybean, and vetches. Of the legumes in agricultural production, soybeans are grown on 50% of the global area devoted to legumes, and represent 68% of the total global legume production (Vance 2001)."
So if you ever want to lower your nitrogen inputs, excess magnesium will do it here. The nitrogen produced by the bacteria will be locked out in direct equivelents to the excess Mag, but can be freed up any time its needed just by adding calcium to neutralize Mag's lockout grip.
This is how Cal Mag fixes a yellowing plant.
In the ground outdoors this just happens.
The water table drops through out the season and calcium goes down with it, allowing Mag to restrict some nitrogen later in the season when flower occurs and the plant switches from growing foliage to producing terpenes.
When nitrogen bacteria get reduced, the extra exudates go to promoting more Phos microbes, and nature flips the process without our help.
Far less tissue is formed in flower so less nitrogen is needed. Less nitrogen in a plant means less water in the plant as nitrogen requires water, so the sap is less diluted, brix climbs, and bugs aren't an issue, plus you break free from soil carbon and indirectly soil nitrogen.
Atmospheric nitrogen must still be run into the soil and through a microbe, and then to the plant, so technically its still soil nitrogen, but the atmosphere is its input, not composting greens.
In pots we must ensure this occurs or be ready to stay low brix and supply the nitrogen.
So here is a mental picture to hold onto.
The ground (or a pot) has good soil. It has adequate calcium to fluff the top 12 inches nicely.
The other ground has enough calcium to fluff the top 18 inches.
A high pressure ridge blows in and it is exactly that... air being squeezed between the outer edge of the atmosphere and the ground, raising pressure.
When that air gets squeezed it gets pushed into the soil.
Air is 78% nitrogen.
Which example, the 12" or the 18" gets more nitrogen?
Then, as almost always, a high pressure ridge finally gets broken by a rain event.
Nitrogen requires water to work.
Think Momma nature has it figured?
Mimic that
Don't smoke bug spray.