How can humans meet the demand for nitrogen in crops?

In agricultural production, in order to meet the demand of crops for nitrogen, the usual measure is to apply nitrogen fertilizer. However, the production of nitrogen fertilizer will consume resources and increase pollution. Excessive application of chemical fertilizer will also harden and acidify the soil and destroy valuable land resources. 78% of the air is nitrogen. If only all plants could make use of nitrogen in the air! With the rapid development of genetic engineering, scientists have been able to transfer the nitrogen-fixing genes of rhizobia to other bacteria. Now, Japanese researchers have isolated nitrogen-fixing bacteria from soil and successfully transplanted them into the roots of sterile rice. Through infection experiment, it is found that they can produce nitrogen fixation ability. In addition, it is also possible to cultivate new varieties with nitrogen fixation ability in the future through cross improvement. By then, rice, corn and even more crops will join the ranks of nitrogen-fixing plants, which can fix nitrogen by themselves. People can use less or even no nitrogen fertilizer, and people no longer have to worry about environmental pollution and resource destruction caused by nitrogen fertilizer application. This can not only reduce investment, but also achieve a bumper harvest in agriculture. What a wonderful prospect! I hope it can be realized in the near future.