Baccharis trimera plants, grown in soil containing 0, 5, 10, 20, or 30 percent (w/w) manure in greenhouse experiments, had improved plant color and growth (increased height, branching, and number of nodes) at the higher nutrient levels as compared with the control without the addition of manure. Generally, the addition of chemical fertilizer to the manure-containing media further increased yields as compared with yields having only manure. The addition of chemical fertilizers to manure-containing pots, however, did not increase the concentration of essential oil in plant tissue. Oil yields were the highest, however, in plants having both manure and chemical fertilizer due to the increased biomass production. No differences in the essential oil constituents were
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