Modern corn production utilizes heterosis of the hybrid generation for high yield and stress resistance. Heterosis refers to the hybridization of two parents with different traits. Its growth potential, viability, fertility, adaptability, yield, and quality are more than those of its parents.
The process opposite to heterosis is the so-called inbreeding recession. As a result of the inbreeding recession, the growth of second generation hybrids and their generations have significantly decreased their growth potential, viability, resistance and yield. In general, if the second-generation species is used for production, the grown plants will be extremely irregular and genetically show segregation, leading to severe reduction in production. The greater the advantage of a generation of hybrids, the greater the yield of the second generation. The peasants have seen that the maize grown in the first generation of hybrid seeds grows neatly in the same order and has more spikes and more high yields. They mistakenly believe that they can be planted again in the next season. After planting seeds for the second year, the result would be a huge loss, and the production of hybrids would be reduced by more than 50% over the previous generation.
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