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Table 2

EDS analyses of the clogging matter collected from the irrigation pipeline at three different times (sample 1: reference time t0; sample 2: t0 + 20 days; sample 3: t0 + 40 days), and application of a t-test (significance level 0.05) to assess the statistical differences between the three compositions

ElementSample 1Sample 2Sample 3Mean
% content% contentpt-testa% contentpt-testa% content
67 ± 3 68 ± 3 7.4·10−1 69 ± 3 5.1·10−1 68 ± 2 
Ca 22 ± 1 20 ± 1 8.0·10−2 21 ± 1 3.2·10−1 21 ± 21 
9.0 ± 0.5 9.2 ± 0.5 6.2·10−1 9.2 ± 0.5 6.2·10−1 9.1 ± 0.3 
Mn 0.19 ± 0.02 0.87 ± 0.09 1.9·10−40.64 ± 0.06 3.1·10−40.57 ± 0.04 
Mg 0.43 ± 0.04 0.52 ± 0.05 8.2·10−2 0.32 ± 0.03 2.4·10−20.42 ± 0.02 
Si 0.51 ± 0.05 0.57 ± 0.06 2.5·10−1 0.14 ± 0.01 2.7·10−40.41 ± 0.01 
Na 0.34 ± 0.03 0.19 ± 0.02 2.6·10−30.14 ± 0.01 7.1·10−40.22 ± 0.03 
Al 0.20 ± 0.02 0.24 ± 0.02 9.1·10−2 0.010 ± 0.001 8.0·10−50.15 ± 0.01 
0.12 ± 0.01 0.13 ± 0.01 3.8·10−1 0.12 ± 0.01 1.0·100 0.123 ± 0.007 
Cl 0.20 ± 0.02 0.040 ± 0.004 1.7·10−40.010 ± 0.001 8.0·10−50.083 ± 0.007 
ElementSample 1Sample 2Sample 3Mean
% content% contentpt-testa% contentpt-testa% content
67 ± 3 68 ± 3 7.4·10−1 69 ± 3 5.1·10−1 68 ± 2 
Ca 22 ± 1 20 ± 1 8.0·10−2 21 ± 1 3.2·10−1 21 ± 21 
9.0 ± 0.5 9.2 ± 0.5 6.2·10−1 9.2 ± 0.5 6.2·10−1 9.1 ± 0.3 
Mn 0.19 ± 0.02 0.87 ± 0.09 1.9·10−40.64 ± 0.06 3.1·10−40.57 ± 0.04 
Mg 0.43 ± 0.04 0.52 ± 0.05 8.2·10−2 0.32 ± 0.03 2.4·10−20.42 ± 0.02 
Si 0.51 ± 0.05 0.57 ± 0.06 2.5·10−1 0.14 ± 0.01 2.7·10−40.41 ± 0.01 
Na 0.34 ± 0.03 0.19 ± 0.02 2.6·10−30.14 ± 0.01 7.1·10−40.22 ± 0.03 
Al 0.20 ± 0.02 0.24 ± 0.02 9.1·10−2 0.010 ± 0.001 8.0·10−50.15 ± 0.01 
0.12 ± 0.01 0.13 ± 0.01 3.8·10−1 0.12 ± 0.01 1.0·100 0.123 ± 0.007 
Cl 0.20 ± 0.02 0.040 ± 0.004 1.7·10−40.010 ± 0.001 8.0·10−50.083 ± 0.007 

aProbability that there are no statistically significant differences between the % content of each monitored element in sample 2 or 3 and the corresponding % content in sample 1. The probabilities lower than the significance level (0.05), corresponding to statistically different % contents, are indicated with an asterisk.

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