Analysis on the Relationship Between Yield Components and Yield of Rice Germplasm in Cold Region

Rice germplasm are classified into three groups induding direct seeding rice,seedling transplantation rice and dry-raising and sparse-planting rice according to the cultivation method.In order to breed high quality and yield varieties,the relationship between yield components and yield of the different varieties of rice was evaluated.The results showed that varieties in dry-raising and sparse-planting perid had suitable yield components and contributed to the yield.Then the breeding targets of rice were put forward,including lodging resistance,few tillers,big panicle,high density panicle,insect and disease resistance,cold resistance,high milled grain rate,good quality,nice to palate,good appearance,high root activity,erect leaves and ripe with the living culms under the dry-raising and sparse-planting condition.