Skip to main content

Table 5 Results of the bioassays employing foliar applications of the 8 samples at 2 carbon rates

From: Characterization of terrestrial dissolved organic matter fractionated by pH and polarity and their biological effects on plant growth

Sample Length (cm) Fresh weight (g) Dry Weight (mg)
Root Shoot Root Shoot
Control 32.7 ± 3.5 28.2 ± 3.9 27.4 155 ± 19 95 ± 36
Whole, 0.01 mg/L C 33.0 ± 3.6 32.6 ± 4.3 30.4 165 ± 31 118 ± 23
(0.881) (0.028) (0.437) (0.111)
Acid soluble, 0.01 mg/L C 36.2 ± 5.5 34.1 ± 3.4 32.8 189 ± 25 125 ± 35
(0.115) (0.002) (0.004) (0.085)
Acid insoluble, 0.01 mg/L C 36.4 ± 8.0 27.8 ± 3.2 28.0 221 ± 37 108 ± 25
(0.197) (0.800) (0.0001) (0.383)
100:0 Filt : Ret, 0.01 mg/L C 37.0 ± 3.3 30.6 ± 3.9 29.5 184 ± 20 111 ± 32
(0.011) (0.190) (0.108) (0.332)
75:25 Filt : Ret, 0.01 mg/L C 35.5 ± 5.6 27.9 ± 6.4 25.7 192 ± 53 89 ± 36
(0.203) (0.894) (0.045) (0.685)
50:50 Filt : Ret, 0.01 ppm 38.3 ± 4.4 27.5 ± 3.6 27.4 219 ± 21 92 ± 21
(0.006) (0.668) (0.0001) (0.777)
25:75 Filt : Ret, 0.01 mg/L C 38.8 ± 5.5 26.3 ± 3.3 25.5 221 ± 39 84 ± 20
(0.008) (0.243) (0.0001) (0.399)
0:100 Filt : Ret, 0.01 mg/L C 36.4 ± 3.1 27.0 ± 3.5 28.4 231 ± 24 98 ± 25
(0.062) (0.457) (0.00004) (0.882)
Whole, 0.1 mg/L C 33.0 ± 1.9 32.1 ± 4.1 29.5 160 ± 14 112 ± 28
(0.809) (0.044) (0.537) (0.260)
Acid soluble, 0.1 mg/L C 35.5 ± 5.5 31.1 ± 2.5 29.3 173 ± 25 112 ± 23
(0.202) (0.063) (0.102) (0.247)
Acid insoluble, 0.1 mg/L C 36.6 ± 5.6 29.1 ± 4.4 28.6 204 ± 30 113 ± 39
(0.078) (0.634) (0.0005) (0.313)
100:0 Filt : Ret, 0.1 mg/L C 32.0 ± 3.5 29.2 ± 5.0 32.3 229 ± 40 118 ± 36
(0.638) (0.645) (0.0001) (0.185)
75:25 Filt : Ret, 0.1 mg/L C 31.9 ± 3.7 26.5 ± 4.1 26.8 214 ± 31 98 ± 29
(0.607) (0.342) (0.0001) (0.872)
50:50 Filt : Ret, 0.1 mg/L C 37.2 ± 5.5 26.8 ± 4.0 25.7 214 ± 37 90 ± 22
(0.041) (0.430) (0.0003) (0.697)
25:75 Filt : Ret, 0.1 mg/L C 33.2 ± 3.8 27.9 ± 4.4 27.5 195 ± 61 105 ± 33
(0.764) (0.862) (0.006) (0.561)
0:100 Filt : Ret, 0.1 mg/L C 31.7 ± 5.6 26.3 ± 3.5 26.1 202 ± 45 90 ± 23
(0.621) (0.253) (0.007) (0.691)
  1. Average values (with the standard deviations) of the 10 individual measurements for each treatment are given for the root and shoot measurements. The fresh weight of all seedlings for a given treatment were taken together to give one measurement. Values in bold indicate a response observably higher than the control, and values in bold-italic indicate a response statistically better than the control. P values are given in parentheses for each measurement. Visual depictions of the root and shoot values are shown in Figure 7.