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9 th EWRS Workshop on Physical and Cultural Weed Control 72 Samsun, Turkey, 28 – 30 March 2011 Table 1. Weather data at the time of flaming treatments for greenhouse experiment at Lincoln, NE in April and September of 2009. Application date April 29 Application time (hours after sunrise) Sunrise/ sunset a Temperature Relative humidity H C % 0 6:24 A.M./ 20 46 4 8:18 P.M. 34 20 8 27 24 12 26 37 September 26 0 7:15 A.M./ 10 22 4 7:15 P.M. 32 19 8 30 19 12 24 23 a Time from Custom Sunrise Sunset Calendar for Lincoln/Omaha, NE, http://www.sunrisesunset.com/custom_srss_calendar.asp Table 2. Leaf relative water content of corn, green foxtail, soybean, and velvetleaf as influenced by various times of day. The values are estimated using Equation 1. a Hours after Corn Green foxtail Soybean Velvetleaf sunrise 0 0.98 0.89 0.82 0.63 4 0.90 0.84 0.85 0.67 8 0.90 0.79 0.63 0.60 12 0.95 0.90 0.80 0.66 SE 0.01 0.03 0.04 0.08 a Abbreviation: SE, standard error.
9 th EWRS Workshop on Physical and Cultural Weed Control 73 Samsun, Turkey, 28 – 30 March 2011 Injury (%) Injury (%) 100 80 60 40 20 0 100 80 60 40 20 0 Corn 0 HAS 4 HAS 8 HAS 12 HAS 0 20 40 60 80 100 Propane dose (kg ha 1 ) Soybean 0 20 40 60 80 100 Propane dose (kg ha 1 ) Injury (%) Injury (%) 100 80 60 40 20 0 100 80 60 40 20 0 Green foxtail 0 20 40 60 80 100 Propane dose (kg ha 1 ) Velvetleaf 0 20 40 60 80 100 Propane dose (kg ha 1 ) Figure 1a. Plant injury as influenced by propane dose at various times of day (0, 4, 8, and 12 h after sunrise-HAS) at 7 d after treatment. The plant species tested were corn, green foxtail, soybean, and velvetleaf. The regression lines are calculated using Equation 2, and the parameter values are presented in Table 3.
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