杂交晚稻机插不同播量条件下育插秧试验研究

以杂交晚稻“江四优992”为供试材料，进行了不同播量软盘育秧机插与常规水育秧手插的对比试验。结果表明：机插软盘育秧随播种量增加，漏插率降低，以90～100g芽谷／盘为最佳播量；机插秧虽然前期分蘖稍慢，但后期具有分蘖稳健、无效分蘖少、成穗率高的特点；机插稻的全生育期比手插稻延长2～3d；与手插稻相比，机插稻的穗粒结构合理，穗粒数多，产量高，平均增产10．2％。

Experimental Study on Seedling-raising and Mechanically Transplanting of Hybrid Late Rice under Different Sowing Densities

The hybrid late rice Jiangsiyou 992 was used as experimental material.Under different sowing densities,difference in the seedling quality and yield between artificially and mechanically transplanted hybrid rice was studied.The results indicated that the effect of sowing density on seedling quality of mechanically transplanted rice was significant,and the suitable sowing density was 90~100 g seed per tray.The mechanically transplanted rice had the characteristics of low tiller in prophase,while steady tiller,less inefficacy tiller and high tiller in anaphase.The total growth duration of mechanically transplanted rice was 2~3 days longer than that of artificially transplanted rice.Through mechanically transplanting,the panicle structure and grain number per spike of rice could be improved,so its yield was increased by 10.2% in average.