Abstract: Irrigation plays an important role in enhancing both forage seed yield and quality in the arid and semi-arid regions.A field experiment was carried out to evaluate the effects of irrigation frequency and water amount on seed yield and seed yield components of Russian wildrye in Gansu province.The results indicate that the five different irrigation frequency treatments effected no difference among Russian wildrye plants in the number of fertile tillers per square meter and spikelets per fertile tiller,though there were significant differences in the number of florets per spikelet,seeds per spikelet,and 1000-seed weight(P<0.05).Four irrigation frequencies:starting from the time when the plant turned green,then when the plant began to grow joints,its ear emergence period,and finally its grouting period,would enhance the number of fertile tillers per m²,and seeds per spikelet.The actual seed yield reached the highest amount of 593.3 kg/hm².The variant irrigation frequency treatments effected differences in the tiller height and spike length of Russian wildrye,but no significant differences on its seed yield and yield components if the irrigation frequency is only three or less.

Key words: Russian wildrye, Irrigation, Seed yield

摘要： 研究不同灌水次数和灌水量对新麦草(Psathy rostachys juncea)种子产量、产量构成和生长特性的影响。结果表明:不同灌水次数的小穗小花数、小穗种子数和千粒重间差异显著(P<0.05),生殖枝数和生殖枝小穗数差异不显著;从返青到收获,灌水4次(返青期、拔节期、抽穗期和灌浆期)生殖枝数和小穗种子数最高,其实际种子产量也最高,达593.3 kg/hm²;不同灌水次数对生殖枝高度和穗长影响显著(P<0.05);不同灌水量对种子产量和产量构成的影响不显著。

关键词: 新麦草, 灌水, 种子产量