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Natural Farming is the not same as Organic Farming
Concept of industry polluting causing global warming needs to be relooked as the chemical agricultural practices have been producing much more negative effects on this aspect.
Photosynthesis by plants is now found to be more than for storing bio chemical energy for itself. Plants actually encourage microbes by providing energy taken in through photosynthesis and giving it into the soil through roots to encourage appropriate microbes to convert minerals in the atmosphere into the soil.
The soil itself has various microbes to fix all the nutrients required by any plant. By artificially giving nutrients externally(say NPK), this capability of the plant is being curtailed. Instead we should encourage the soil to get rich by the microbes. This can primarily be done by giving conditions for the microbes to thrive, for example have proper mulching and also have plant diversity. The mulching should not be plastic or even a very thick layer of compressed material because it can reduce the air circulation and be negative for the microbes. Put sticks of leaves rather than leaves themselves to allow airflow. Avoid putting green leaves during the rainy season as it can negatively affect the soil microbes.
Adding chemical fertiliser Nitrogen manually to the soil causes the plants to reduce the nitrogen fixing (free living)bacteria and instead encourage nitrogen reducing microbes.(Plant assumes that there is already availability in access and this is not required to waste energy to encourage nitrogen fixing bacteria ). (this is similar to the human body reducing the insulin generation when externally insulin injection is given to a patient ).
Photosynthesis using solar energy causes carbon in air to be absorbed and converted to carbon in soil.
Without plants' actions, the default place for Nitrogen is to be in air and not in soil. The excess Nitrogen in soil gets released into the air as Nitrous oxide by action of Nitrogen releasing microbes.
The reason being the carbon content in the soil is decreased because nitrogen releasing bacteria structure is 10 Carbon:1 Nitrogen, essentially significantly reducing Carbon in soil.
By facilitating more carbon in the soil, we are positively reducing the carbon in the air and also more carbon and soil would imply that there is more water storage capacity in the soil.
While in general Nitrogen fixing bacteria is known as symbiotic bacteria(Rhyzobium), in nature only 1% of nitrogen fixing is done by such microbes in nature. 99% Nitrogen is fixed by free living bacteria.
When nitrogen content is high in soil, it's a trigger for plants to reduce photosynthesis activity. This has two negative consequences on global warming, 1) more carbon in air and 2) by not using the solar rays, it's heat is reflected back to the atmosphere.
Even phosphorus absorption needs the presence of Nitrogen.
Plants fight for sunlight only and not for nutrients, in fact different plants symbiotically help each other for nutrients.
There are different types of trees and grass climbers etc which should be properly planted as diverse crops instead of having monocrop to encourage soil quality with different microbes that can add nutrients to soil. This would also encourage different species of birds and animals whose droppings also contribute to microbes that can fix nutrients to soil.
We should not waste sunlight at all and have as many plants as possible with different heights so as not to have competition for sunlight. In fact there is nothing really a weed and it is useful to the plants we are interested in if it's not blocking the sunlight to the plant.
Organic farming however has organic inputs required which will mean more cost and also the same issue of more nitrogen content issue. Natural farming is the way to encourage microbes by crop diversity, cover crops and mulching, animal and bird droppings, and if required using microbial rich jeevamutrutham.
The first year the yield might actually be low compared to using chemical fertilizer, but as the soil quality improves, in a couple of years, yield will significantly improve at the same time significantly lowering input costs.