It is really simple. A weight of root below ground produces a similar weight above ground. Thus the most important aspect of production is to maximize the bio weight that is underground. This should have been perfected centuries ago but has obviously not. Now it is been applied by improved spacing and the crop responds. Of course the use of organic fertilizers provides an additional influx of full spectrum nutrition that ensures optimal production also.
Miracle grow: Indian farmers smash crop yield records without GMOs
[Sumant] Kumar, a shy young farmer in Nalanda district of India’s poorest state Bihar, had — using only farmyard manure and without any herbicides — grown an astonishing 22.4 tonnes of rice on one hectare [~2.5 acres] of land. This was a world record and with rice the staple food of more than half the world’s population of seven billion, big news.
It beat not just the 19.4 tonnes achieved by the “father of rice”, the Chinese agricultural scientist Yuan Longping, but the World Bank-funded scientists at the International Rice Research Institute in the Philippines, and anything achieved by the biggest European and American seed and GM companies. And it was not just Sumant Kumar. Krishna, Nitish, Sanjay and Bijay, his friends and rivals in Darveshpura, all recorded over 17 tonnes, and many others in the villages around claimed to have more than doubled their usual yields.
SRI is a set of management practices and nothing else, many of which have been known for a long time and are best recommended practice … Scientifically speaking I don’t believe there is any miracle. When people independently have evaluated SRI principles then the result has usually been quite different from what has been reported on farm evaluations conducted by NGOs and others who are promoting it. Most scientists have had difficulty replicating the observations.
If any scientist or a company came up with a technology that almost guaranteed a 50% increase in yields at no extra cost they would get a Nobel prize. But when young Biharian farmers do that they get nothing.