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The objective8 of tbia study were to: (1) determine tbe effecta of temperature and water stress on germination, and; (2) evaluate effects of seeding date on emergence and auvival of green and gray rubbermbbitbNeb(Clvysollromnc nauwanu(PaUas)Britt. sulmp. graveole~ (Nutt.) Piper. md Chrysothanmus nauseosla (P8UM) Britt. subep. nuuscosus (Nutt.) Piper.). Seeds of botb sbruba were incubated at 10,20, and 300 C in a gradient of osmotic potentials ranging from 0.0 to -1.5 MPa. Seedings were also made in tht field on reeding dates over a period of 3 years. Total germination and germination rate declined aa temperaturen end osmotic potential8 decreased; they wtre bigbest for both sbruk at 20 and 300 C and lowest at 10” C. Under field conditions seedling populationa wert limited by low emergence and survival relative to viable seed planted. Emergence and survival of aeedlinga were highest in an exceptionally wet year, declining in 8ubeequtnt yttn that were drier. Emtrgenct rnnged from 0 to 6.9% and 0 to 7.1% and surviv81 of emerged seedling8 ranged fkom 6.6 to 5% and 0 to 60% for green and gray rubber rabbitbrush, respectivtly. Survival of green rubber rabbitbrusb was bigbest from mid-spring plantings, but no distinctively favortblt seeding date was found for gray rubber nbbitbrusb. Results suggest that seeds of these shrubs should be planted prior to or during periods wbtn seedbed temperature8 are in tbe 20 to 39 C range and soil moisture is txpttttd near its seasonal bigb.

Germination of Green and Gray Rubber Rabbitbrush and Their Establishment on Coal Mined Land