Why does corn seed every year?

At present, maize mainly uses hybrid F 1 seed, in order to use the excellent performance of heterosis to increase yield.

After planting F 1, the seeds of F2 generation, that is, commercial corn, which we often say, can be directly used as feed instead of being used as seeds.

This is because, after the F2 generation is planted, according to the general genetic law, the offspring will naturally separate 1: 2: 1, and the production capacity and other traits will be confused, and the utilization value will drop a lot and the reuse value will be lost. Therefore, F 1 hybrid is adopted every year.

This requires the seed production industry to produce seeds every year and produce high-purity hybrid seeds for production.