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Table 2 Effects of micro-dams in potato cropping and distinct strategies in maize cultivation on runoff quantities, erosion, plant protection product (PPP) loads and curve numbers (CN; means), as means with standard deviations, 10th percentiles, and ranges; n.a.: not applicable

From: Consideration of risk management practices in regulatory risk assessments: evaluation of field trials with micro-dams to reduce pesticide transport via surface runoff and soil erosion

 PotatoesMaize
Olivier et al. 29]Goffart et al. [21]a,gAurbacher et al. [6]bAreas [3]cAreas [4]CIPF [7]d,eUCL [41]d,e
20092010
Runoff reduction86% (± 14%)
10th pt.: 82% (47%–100%)
79% (± 19%),
10th pt.: 61% (53%–98%)
98%81% (69%–93%)84%53% (± 24%)
36%, 70%
48% (± 6%)
52%, 44%
Runoff change− 86% (± 7%), 10th percentile: − 80%− 51% (± 9%), 10th percentile: − 45%
Erosion reduction85% (± 35%)
10th pt.: 67% (0%–100%)
88% (± 17%)
10th pt.: 71% (58%–100%)
97%n.a.n.a.67% (± 15%)
57%, 78%
76% (± 2%)
77%, 74%
Erosion change− 90% (± 6%), 10th percentile: − 86%− 71% (± 6%), 10th percentile: − 68%
PPP reductionfn = 4, 91% (± 5%)
10th pt.: 86% (87%–96%)
n = 5, 84% (± 20%)
10th pt.: 62% (56%–100%)
n.a.n.a.n.a.n = 4.50% (± 17%)
38%, 62%
n = 1.41% (± 7%),36%, 46%
PPP change− 88% (± 4%), 10th percentile: − 85%− 46% (± 12%), 10th percentile: − 39%
CN untreated837592956878
CN treated7339737867/64d
Mean: 65
75/73d
Mean: 74
→CN reduction10 (12%)36 (48%)19 (21%)17 (18%)3 (4%)4 (5%)
CN changegMean CN untreated/treated: 86/66 (reduction: 21 ± 11; 10th percentile: 12)
(− 25% (± 16%), 10th percentile: − 14%)
− 5% (± 0.7%)
  1. a%-tal reductions in runoff, erosion and PPP reduction given as mean values of 5 trials over the 2 years
  2. bMean values over the 35 reported trials available only
  3. cRunoff was generated “delayed” in this trial, both CN and  %-tal runoff reduction based on the 2 measurements after 40 mm of artificial rain
  4. dTwo distinct techniques were applied: disc and drum plough
  5. eRunoff, erosion, and PPP reduction percentages: all evaluations are given as mean values over the distinct treatments
  6. fAverage reductions of the sums of PPP solved in runoff water and sorbed to the sediment; over all PPP applied
  7. gDue to the conceptual difference of one reported value for a complete season, CN from Goffart et al. [21] were not included here (see Additional file 1: Table S3 for details)