Physical and Cultural Weed Control Working Group of - European ...

9 th EWRS Workshop on Physical and Cultural Weed Control 74
Samsun, Turkey, 28 – 30 March 2011
Table 3. Regression parameters (Figure 1a) for plant injury of corn, green foxtail, soybean, and
velvetleaf as affected by propane dose at various times of day at 7 d after treatment. Regression
parameters are estimated using Equation 2. a,b
Species Hours after
Regression parameters (± SE)
sunrise B D I50
Corn 0 –3.5 (0.2) 60 (7) 25 (1)
4 –2.9 (0.3) 58 (5) 22 (1)
8 –2.7 (0.4) 66 (4) 24 (1)
12 –3.2 (0.2) 74 (4) 21 (1)
Green foxtail 0 –2.5 (1.0) 62 (5) 37 (5)
4 –2.6 (1.0) 59 (5) 37 (5)
8 –2.9 (0.7) 76 (7) 37 (3)
12 –2.2 (0.9) 82 (4) 32 (5)
Soybean 0 –3.0 (0.6) 70 (7) 35 (2)
4 –3.2 (0.9) 77 (7) 41 (4)
8 –2.5 (0.7) 79 (6) 33 (3)
12 –3.4 (0.3) 89 (5) 28 (1)
Velvetleaf 0 –2.7 (0.4) 80 (6) 21 (1)
4 –2.5 (0.4) 79 (4) 21 (2)
8 –3.2 (0.2) 87 (2) 21 (1)
12 –1.6 (0.7) 93 (2) 12 (6)
a
Abbreviations: B, the slope of the line at the inflection point; D, the upper limit; I50, the dose of
propane resulting in a 50% response between the upper and lower limit.
b
No treatment-by-experimental run interaction occurred; therefore, the data were pooled over two
experimental runs.