为探明成都平原稻-麦轮作模式下播种量和品种熟期对直播稻产量和光能利用效率的影响，以早熟杂交稻品种川作优8727、中熟杂交稻品种辐优838、迟熟杂交稻品种内6优107为材料，于2019年采用人工撒播栽培方式在成都平原进行不同播种量（15.0、22.5、30.0、37.5、45.0 kg/hm2）大田试验。结果表明，随着播种量的增加，直播稻产量和光能利用效率呈先增加后下降的趋势，其中，川作优8727以播种量30.0 kg/hm2的处理产量和光能利用效率最高，辐优838和内6优107以播种量22.5 kg/hm2的处理产量和光能利用效率最高；与辐优838和内6优107相比，川作优8727产量分别增加了8.8%、3.7%，其增产优势主要表现在有效穗数、结实率和收获指数上，光能利用效率分别增加15.3%、13.3%。可见，成都平原稻-麦两熟区水稻麦后直播种植宜采用早熟杂交稻品种，其适宜播种量为30.0 kg/hm2。

In order to understand the effects of seeding rate and maturity stage on grain yield and radiation use efficiency （RUE） of direct seeding rice in wheat-rice cropping system, a field experiment with early maturity rice cultivar Chuanzuoyou 8727, medium maturity rice cultivar Fuyou 838 and late maturity rice cultivar Nei 6 you107 was conducted at Chengdu Plain in 2019. The seeding rate treatments were established as 15.0, 22.5, 30.0, 37.5, 45.0 kg/hm2 by artificial broadcasting. The results showed that panicles per m2 and total dry matter weight of direct seeding rice showed an increasing tendency with seeding rate increasing, while spikelets per panicle and dry matter weight per plant of direct seeding rice showed a decreasing trend with seeding rate increasing. The grain yield and RUE of direct seeding rice firstly increased and then decreased with seeding rate increasing. Chuanzuoyou 8727 recorded the highest grain yield and RUE when the seeding rate was 30.0 kg/hm2, and Fuyou 838 and Nei 6 you 107 recorded the highest grain yield and RUE when the seeding rate was 22.5 kg/hm2. Chuanzuoyou 8727 produced higher grain yield than Fuyou 838 and Nei 6 you 107 by 8.8% and 3.7%, respectively. The higher panicles per m2, seed setting rate and harvest index in Chuanzuoyou 8727 were responsible for high grain yield compared with Fuyou 838 and Nei 6 you 107. Chuanzuoyou 8727 had higher RUE than Fuyou 838 and Nei 6 you 107 by 15.3% and 13.3%, respectively. The results suggested that the optimum seeding rate of hybrid rice with early maturity is 30.0 kg/hm2 under wheat-rice cropping system in Chengdu Plain.