近几年来,二季晚稻大面积生产用的种子,大部分采用二季稻种作种;特别是“农垦58”品种,由于长期用二季稻种作种,增加退化的严重性,影响了二季晚稻的产量。我所对“农垦58”晚稻用种问题进行了比较试验,结果一季晚稻或二季晚稻用一季稻种作种均比用二季稻种作种的增产11.3-12％,经济性状也有差异(见表)。 In recent years, most of the seeds used for large-scale production of late rice in the second season have been planted as second-season rice varieties. In particular, the “Nongken 58” cultivars have increased the severity of the degradation due to the long-term use of the second- Yield. I conducted a comparative test of the “Nongken 58” late rice use of the results of a late rice or second season late rice with a quarter of rice as seed than the second season rice for seed production increased 11.3-12%, economic traits are also different (see table ).