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    Author(s): Clinton C. Shock; Erik B. G. Feibert; Lamont D. Saunders; Nancy Shaw; Ann DeBolt
    Date: 2007
    Source: Corvallis, OR: Oregon State University Agricultural Experiment Station. Special Report 1075: 13-20.
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (2.7 MB)


    Native forb seed is needed to restore rangelands of the Intermountain West. Commercial seed production is necessary to provide the quantity of seed needed for restoration efforts. A major limitation to economically viable commercial production of native forb seed is stable and consistent seed productivity over years. Variations in spring rainfall and soil moisture result in highly unpredictable water stress at seed set and development. Excessive water stress during seed set and development is known to compromise yield and quality of other seed crops. Native forbs are not competitive with crop weeds. Both sprinkler and furrow irrigation promote seed production, but risk encouraging weeds. Furthermore, sprinkler and furrow irrigation can lead to the loss of plant stand and seed production to fungal pathogens. By burying drip tapes at 12-inch depth, and avoiding wetting of the soil surface, we hope to assure flowering and seed set without encouraging weeds or opportunistic diseases. This trial tested the effect of three irrigation intensities on the seed yield of seven native forb species.

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    Shock, Clinton C.; Feibert, Erik B. G.; Saunders, Lamont D.; Shaw, Nancy; DeBolt, Ann. 2007. Seed production of native forbs shows little response to irrigation in a wet year. Corvallis, OR: Oregon State University Agricultural Experiment Station. Special Report 1075: 13-20.


    native forb seed, irrigation, productivity, crops, weeds

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