[Relationship of population quality and nitrogen fertilizer utilization characteristics of direct seeding rice under water-nitrogen interaction].

Understanding population quality and nitrogen utilization characteristics of direct seeding rice under water-nitrogen interaction could provide theoretical and practical basis for high yield and ample production of direct seeding rice. Hybrid rice F You 498 was used as the material. Three irrigation methods were set in this study: flooding irrigation (W), dry-wet alternate irrigation (W) and drying irrigation (W), with different ratio of base fertilizer: tiller fertilizer: panicle fertilizer at 5:3:2 (N), 3:3:4 (N), 3:1:6 (N), respectively.