Dissemination of weed seeds by surface irrigation water in western Nebraska.

摘要: Studies were conducted in 1977 and 1978 to evaluate the impact of surface irrigation water on dissemination weed seed North Platte River Project from May through September each year. Seventy-seven different plant species found water, with germination averaging 26%. Two five times more two canals than River. As moved canals, content increased dramatically. The majority collected was floating surface. Amounts varied time largest amounts being June July gradually declining August September. Samples also taken determine amount entering field during growing season. During season disseminated 48,400 per ha sampled fields. Additional index words. Seed germination, river, canal, Cirsium arvense.