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群体内改良采用混合选择法(M)、穗行选择法(E)、半同胞选择法(H)、S_1选择法(S)和全同(?)轮回选择法(F)。其中穗行选择法的产量增益率最为稳定一致(接近3%/轮)。群体间改良采用交互轮回选择法(R)、S_1选择法和穗行选择法。交互轮回选择法的每轮增益近7%,而穗行选择法在品种杂交组合中的增益很少。从交互轮回选择的 C_2、C_3和 C_4轮群体中选育自交系(分别选至 S_3代),然后进行所有可能的杂交组配。品比试验结果,在抗倒伏方面选择增益显著,最佳三交种的增益高于群体杂交种2～5%
In the population improvement, mixed selection method (M), panicle selection method (E), semi-sibling selection method (H), S 1 selection method (S) and isotactic cycle selection (F) were used. Among them, the earning yield rate of ear selection is the most consistent (close to 3% / round). Improved inter-group selection using interactive cycle (R), S_1 selection method and ear selection method. The reciprocal cycle selection method has a gain of nearly 7% per round, while the ear row selection method has very little gain in the crossbreeds. Inbred lines of C_2, C_3 and C_4 selected from reciprocal cycles (selected to S_3 generations, respectively) were selected and all possible crosses were performed. In comparison with the test results, the gain of choice in lodging resistance was significant, the gain of the best three crossbreds was higher than that of the population hybrids by 2 ~ 5%