水稻旱育秧床施用除草剂对不同萌发状态种子出苗和秧苗生长的影响

目的]研究旱育秧床播后施用除草剂对种子出苗和幼苗生长的影响。方法]以3种不同粒型的杂交稻种子为材料,在吸胀谷、露白谷、短芽谷和长芽谷4种萌发状态播种后进行除草剂处理,以不施用除草剂为对照,观察其出苗速度、最终出苗数和秧苗生长情况。结果]吸胀谷和露白谷除草剂处理的出苗速度和出苗数与对照无明显差异;短芽谷和长芽谷除草剂处理的出苗速度受到不同程度的抑制,短圆粒型和粗长粒型种子的最终出苗数与对照差异不显著,但细长粒型种子的最终出苗数极显著低于对照。除草剂处理秧苗的发根数、根干重和地上部干重等也不同程度地低于对照。结论]水稻旱育秧床播后施用除草剂对种子出苗和秧苗生长的影响程度与种子萌发状态和粒型有明显关系,除草剂对萌发程度较高和细长粒型种子的出苗及秧苗生长具有较强的抑制作用。

Effects of Herbicide Used in Dry Seedling Bed on Emergence of Hybrid Rice Seed with Different Germination State and Seedling Growth

Objective] The study aimed to discuss effects of herbicide used in dry seedling bed on emergence of hybrid seed with different germination state and seedling growth.Method] With three kinds of different grain type of hybrid rice seeds as materials,the herbicide was used in hybrid rice dry seedling bed after sowing and the seed had four germination state which is absorb-water grain,exposure-white grain,short-bud grain and long-bud grain,and the germination speed,emergence rate of seed and growth of seedlings were observed taking no herbicides as contrast.Result] the germination speed and emergence rate between absorb-water grain and exposure-white grain showed no significant differences in the herbicides treatment and contrast,and the germination speed of short-bud grain and long-bud grain treated with herbicides had suppressed variously.The final emergence rate of short-bud grain and long-bud grain treated with herbicides which belong to short-round and thick-long grain seed had no significant difference than contrast,but that of fine-long grain seed was significantly lower than contrast.The root numbers,dry weight of root and shoot dry weight of seedling growing from the seed with herbicides treatment was lower variously than contrast.Conclusion] The influence of herbicide was used in hybrid rice dry seedling bed after sow to emergence of seed and seedling growth was associated with germination state and grain type of seed.The herbicide has strong inhibition effect to that of seed with higher germination degree and fine-long grain traits.