冰草的四个品种两两成对授粉杂交,其杂种后代的干草产量和亲本及亲本混种栽培作比较。杂交种较亲本平均增产2—3％,而混种仅为0—1％。最高增产为苏米提(S)×诺尔丹(N)杂种,比亲本S增产达4—8％。杂交率范围0—56％,第一组平均为16％,第二组平均为21％。冰草(Agropyron cristatum(L.)Gaerta.)的秋水仙诱变四倍体作播种亲本其杂交率微低于天然四倍体沙生冰草(Agropyron desertorum(Fisch.)Schult.)作亲本者,但用亲本花粉杂交则为12—34％。 The four varieties of Agropyron were pairwise pollinated in pairs, the hay yield of its hybrid offspring was compared with that of the parents and parents. The hybrids increased 2-3% more on average than the parents, while the hybrid was only 0-1%. The highest yield was Sumiteli × Nol Dan (N) hybrid, which increased yield by 4-8% compared with that of P. The rate of hybridization ranged from 0 to 56%, with an average of 16% in the first group and an average of 21% in the second group. The hybridization rate of Agropyron cristatum (L.) Gaerta. Was lower than that of natural tetraploid Agropyron desertorum (Fisch.) Schult. , But 12-34% with the parent pollen hybrid.