Weed Seed Germination Under Simulated Drought

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Abstract
Seeds of five crop and 17 weed species were germinated with 0, 3, 6, and 10-bar water solutions of polyethylene glycol to simulate drought. With simulated drought, most weed species germinated better than soybeans (Glycine maxL. ‘Hampton 266A’) but were not equal to pearlmillet [Pennisetum typhoides(Burm.) Stapf. and C. E. Hubb ‘Millex 23’] or sorghum-sudangrass [Sorghum bicolor(L.) Moench xS. sudanense(Piper) ‘SX-16’]. Prickly sida (Sida spinosaL,), sicklepod (Cassia obtusifoliaL.), andIpomoea lacunosaL. were the most tolerant weed species to simulated drought. Four species were intermediate in tolerance and four species germinated poorly under simulated drought. Hemp sesbania [Sesbania exaltata(Raf.) Cory] was the least tolerant and was similar to soybean.