Depth (cm) Begining of the study End of the study
GW TWW GW TWW
0-20 70.14a* 81.67a* 48.05a* 36.75a*
20-40 85.35a* 67.75a* 40.15a* 32.42a*
40-60 51.05a* 54.57a* 59.57a* 41.79a*
60-80 64.87a* 81.78a* 55.05a* 36.12a*
80-100 56.04a* 63.27a* 53.89a* 35.65a*
Data in the same column followed by the same letter (a, c) were not significantly different at the P < 0.05 level, and (*) indicates that there is no significant difference (P < 0.05) between GW soil and TWW soil.
Table 9: Means of NO3- (mg kg-1) for each soil layer at the beginning and the end of the study.
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