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    Author(s): Clinton C. Shock; Erik B. G. Feibert; Alicia Rivera; Lamont D. Saunders; Nancy ShawFrancis F. Kilkenny
    Date: 2018
    Source: HortScience. 53(5): 692-697.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (270.0 KB)


    Increasing the supply of native wildflower seed is essential for restoring burned and degraded wildlands in the Intermountain West. Limitations to wildland seed collection necessitate development of effective cultural practices to improve reliability of seed production in agricultural fields. Irrigation trials were conducted over multiple years for three perennial species in the Fabaceae family [Dalea ornata (Douglas ex Hook.) Eaton & J. Wright, Dalea searlsiae (A. Gray) Barneby, and Astragalus filipes Torr. ex A. Gray]. Each of the three species was grown at the Oregon State University Malheur Experiment Station, Ontario, OR and received 0, 100, or 200 mm·yearL1 of drip irrigation in four equal biweekly increments during bud formation and flowering. Seed yield responses to irrigation were evaluated by linear and quadratic regression against 1) applied water, 2) applied water plus spring precipitation, 3) applied water plus winter and spring precipitation, and 4) applied water plus fall, winter, and spring precipitation. In general, seed yields responded quadratically to irrigation. Adding fall, winter, and spring precipitation to applied water improved the accuracy of estimated water requirements for maximum seed production of D. ornata and D. searlsiae. For D. ornata, the highest yields averaged 396 kg·haL1 and ranged from 146 to 545 kg·haL1. Averaged over 6 years, seed yield of D. ornata was highest with applied water plus fall, winter, and spring precipitation totaling 393 mm. For D. searlsiae, the highest yields averaged 260 kg·haL1 and ranged from 51 to 424 kg·haL1. Averaged over 6 years, seed yield of D. searlsiae was highest with applied water plus fall, winter, and spring precipitation totaling 412 mm. Seed yields of A. filipes ranged from 7 to 110 kg·haL1 depending on year and averaged 40 kg·ha1 over 6 years. Seed yields of A. filipes did not respond to irrigation in any of the 5 years of testing.

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    Shock, Clinton C.; Feibert, Erik B. G.; Rivera, Alicia; Saunders, Lamont D.; Shaw, Nancy; Kilkenny, Francis F. 2018. Irrigation requirements for seed production of three leguminous wildflowers of the U.S. Intermountain West. HortScience. 53(5): 692-697.


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    subsurface drip irrigation, rangeland restoration, Dalea ornata, Dalea searlsiae, Astragalus filipes

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