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Laboratory Bioassay for Phytotoxicity

An Example from Wheat Straw

^a Dep. of Agric. Sci. (Weed Sci.), The Royal Veterinary and Agric. Univ., Thorvaldsensvej 40, DK-1871 Frederiksberg C, Copenhagen, Denmark
^b Dep. of Botany, Panjab Univ., Chandigarh 160014, India

View larger version (15K): [in a new window]   Fig. 1 Effect of soil amended with different concentrations 12.5, 25, 50, and 100% (full strength) of wheat straw (unburned and burned) leachate on root growth of perennial ryegrass. Experiments were replicated four times and repeated once

View larger version (28K): [in a new window]   Fig. 2 Effect of soil amended with four concentrations 12.5, 25, 50, and 100% (full strength) of wheat straw leachate (WSL) and three concentrations (0.25, 0.50, and 1 g) of charcoal on root growth of perennial ryegrass for (A) Experiment 1 and (B) Experiment 2. Soil amended only with charcoal served as the control. Experiments were replicated four times and repeated once

View larger version (34K): [in a new window]   Fig. 3 Effect of soil amended with four concentrations 12.5, 25, 50, and 100% (full strength) of wheat straw leachate (WSL) and five concentrations (0, 0.25, 0.50, 0.75, and 1 mM) of N fertilizer on root growth of perennial ryegrass for (A) Experiment 1 and (B) Experiment 2. Soil amended with 0 mM of N fertilizer served as the control. Experiments were replicated four times and repeated once