Effect of Irrigation Frequency and Amount on Seed Yield and Yield Components of Russian Wildrye
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.
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