The agronomic characters of 12 representative cultivars in three stages during the replacement of winter wheat after liberation in Shandong province were investigated. Results showed that the leaf area (flag leaf, the second and the third leaf from the top), fertile spikelet density and grain density trended to increase progressively, the plant height, the second node length from the base of the plant and spike neck length trended to decrease successively, while the varition pattern of the spike le...