Effect of tillage and Zea mays on Chenopodium album seedling emergence anddensity

We studied the effect of tillage systems (no-till, chisel, and moldboard pl ow) and the presence or absence of Zea mays L. (corn) on soil temperature, moisture, and, subsequently, the emergence phenology and density of Chenopo dium album L. (common lambsquarters) at two sites (Elora and Woodstock) fro m 1993 to 1995. The tillage system affected the phenology of C. album seedl ing emergence only in 1995. In that year, more days were required to reach 80% cumulative seedling emergence in no-till than in the chisel or moldboar d plow treatments. The delay in obtaining 80% cumulative emergence was attr ibuted to a dry period from days 159 to 177 at flora and from days 155 and 176 at Woodstock. The presence or absence of Z. mays did not affect soil te mperatures, soil moisture, or C, album seedling emergence phenologies. Chen opodium album seedling density was influenced by tillage and environmental conditions. Large variations in seedling density were attributed to environ mental conditions. The presence or absence of Z. mays did nor affect C. alb um seedling density. Nomenclature: Chenopodium album L. CHEAL, common lambsquarters; Zea mays L. 'Pioneer 3902,' corn.