1. Mechanical mixing. During the process of planting, harvesting, picking, and transporting peanuts, due to the lack of strict production and management operating procedures, the use of other types of seeds, such as machine tools and sun drying, or other types of seeds used for replanting, can be caused. Peanut varieties are mechanically mixed.
2. Biological mixed. Although peanuts are self-pollination crops, due to a variety of factors, there is always a certain degree of natural cross-pollination that causes genetic recombination and variation. In the production, if different varieties are planted adjacent to each other without proper isolation, natural hybridization may occur between the varieties, and different types of plants may be separated from the hybrid offspring, so that the uniformity and purity of the varieties may be reduced, and the yield and quality may be reduced.
3. Genetic factors of a cultivar A peanut cultivar is not an absolute pedigree, and there will always be genetic differences. In particular, cultivars bred through crosses will continue to separate individual traits. Even if it is the same peanut plant, its genotype may not be completely homozygous. Due to various factors, the original typical traits are lost.
4. Influence of environmental conditions. Under unfavorable environmental conditions, the good traits of peanut varieties will gradually weaken, and some undesirable traits will be naturally selected and retained, and will continue to increase, and the high yield of improved varieties will deteriorate and deteriorate. In the case of too few seeds, it is also easy to cause the genetic variation of peanut varieties.
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