根据科学试验和生产实践经验证明,水稻年年换种的好处,有以下几点: 一、可以减少品种混杂退化现象一个水稻品种经过多年的生产利用后,会产生混杂退化,降低纯度;或在生物学性状上发生不良变化,降低产量、品质及抗灾能力,这就是品种混杂退化现象。其主要危害是降低水稻产量和品质,如减产能达到10%以上,优质米的米粒变形,垩白增加,食味变劣等。如果年年换种,就可以避免上述现象发生。 According to scientific experiments and practical experience in production practice, the benefits of annual rice replanting are as follows: 1. Reduce the phenomenon of hybrid degeneration. After years of production and use, a rice variety will produce mixed degeneration and reduce the purity; or Biological traits occur adverse changes, reduce yield, quality and resilience, which is the phenomenon of hybrid degeneration. The main harm is to reduce the yield and quality of rice, such as reduced production capacity to achieve more than 10%, high-quality rice grain deformation, chalky increase, deterioration of eating habits. If you change the year, you can avoid this phenomenon.