【摘要】 【目的】本研究旨在探明水卷苗机插高产适宜的播种量。【方法】以长江中下游地区代表性品种武运粳24号(常规粳稻)和6两优9368(杂交籼稻)为供试材料,研究不同播种量对水卷苗秧苗素质、机插质量、大田生长特性及产量的影响。【结果】移栽前秧苗地上部和根系干物质量、发根力、根系活性、成苗率、苗基宽、重高比及光合速率均随着播种量的降低而显著增强,叶面积指数显著下降。小播量处理秧苗返青活棵快、分蘖发生力强、每穗粒数多,但播量过小导致基本苗和穗数不足,当武运粳24号播种量从180 g/盘降低到120 g/盘(738.9 g/m~2)、6两优9368播种量从110 g/盘降低到70 g/盘(431.0 g/m~2)时,产量没有显著变化;但播种量继续降低,产量均显著下降。【结论】水卷苗育秧方法适宜播种量,常规粳稻为2.03粒/cm~2,杂交籼稻为1.14粒/cm~2。更多还原

【Abstract】 【Objective】The objective of the research is to determine the suitable sowing density of hydroponically grown long-mat rice seedlings（HLMS） under mechanical transplanting. 【Method】The effects of sowing densities on seedling quality, mechanical transplanting quality, field growth characteristics and yield of HLMS were analyzed. A widely grown conventional japonica rice cultivar（Wuyunjing 24） and an indica hybrid rice cultivar（6 Liangyou 9368） were used as test materials. 【Result】Dry weight of shoot and root, root-developing ability, root activity, seedling emergence rate, seedling base stem diameter, dry weight per unit of seedling height and photosynthetic rate were significantly increased and the leaf area index was significantly decreased with decreasing sowing density for both cultivars before transplantation. There were advantages of seedling reviving in the paddy field, tillering capacity and spikelet number per panicle for thin sowing treatments, but less basic seedlings and panicles at too low sowing density. The grain yield was not decreased significantly when the sowing density reduced to 738.9 g/m² for Wuyunjing 24 and 431.0 g/m² for 6 Liangyou 9368, respectively. However, the yield was decreased significantly when sowing density reduced continuously for both cultivars. 【Conclusion】 The suitable sowing density of HLMS was 2.03 cm^-2 for Wuyunjing 24 and 1.14 cm^-2 for 6 Liangyou 9368, respectively.更多还原