Effects of Seedling Rate on Plant Productivity and Grain Yield of Jingdong 8 and Jimai 22

In order to provide a theoretical basis of wheat high-yield in eastern area of Heibei province,the study selected two wheat cultivars: Jingdong 8 and Jimai 22,and set four seedling rates( 3. 0,4. 5,6. 0 and 7. 5 million seedlings per hm2) to investigate the effects of sowing density on plant yield potential. The results showed that spike number and dry matter accumulation per plant,grain number,and economic coefficient declined with the increase of seedling rate. In the conditions of this study,grain yield per plant decreased,while yield per m2exist differences between the two cultivars. To Jimai 22,yield per m2showed an unimodal curve with the seedling rate increase and reached the highest yield at 6. 0 million seedlings per hm2. However,yield per m2of Jingdong 8 enhanced with the increase of seedling rate. In conclusion,with the increasing of seedling rate,single wheat plant productivity decreased,while grain yield of wheat stand increased firstly and then decreased.