Impact of the Application of Domestic Wastewater by Subsurface Drip Irrigation on the Soil Solution in Sugarcane Cultivation
Table 4
Average anion and cation concentrations and values of electrical conductivity and pH in soil solution by the time of the first sugarcane sack.
Depth1 (m)
Treat2
NO3−
Ca2+
Mg2+
K+
SO4−2
Na+
EC
pH
(mg·L−1)
(dS·m−1)
0.10
A20
8.0
17.9
2.3
3.6
2.8
0.8
177.5
7.5
A40
3.7
13.9
1.6
5.4
3.9
0.5
144.0
7.6
E20
5.0
18.8
2.8
6.3
4.3
0.5
210.0
7.4
E40
4.4
16.5
2.3
15.8
5.3
0.5
251.5
7.4
SI
5.5
16.4
2.4
4.6
3.3
0.5
158.2
7.4
0.30
A20
5.5
17.8
3.3
4.9
2.3
1.5
155.9
7.6
A40
2.3
15.0
1.4
4.3
2.5
0.5
146.0
7.6
E20
4.7
17.6
1.3
1.8
3.0
2.1
133.0
7.4
E40
2.6
14.9
1.9
1.8
2.1
1.0
149.3
7.5
SI
2.6
15.4
2.0
2.9
2.9
0.6
140.1
7.4
0.50
A20
2.5
16.5
1.3
3.8
2.9
1.0
150.0
7.6
A40
1.9
10.5
1.0
1.5
2.3
0.9
122.5
7.3
E20
1.7
8.4
1.0
2.4
2.0
1.4
114.3
7.4
E40
2.4
16.3
2.6
0.5
3.0
6.9
200.0
7.4
SI
2.5
24.0
2.0
1.9
2.6
0.8
175.5
7.3
0.70
A20
2.8
12.0
1.5
2.8
3.0
1.0
130.5
7.6
A40
1.8
9.0
1.0
2.5
2.4
1.0
112.3
7.6
E20
1.2
10.5
1.3
2.3
2.6
1.8
112.5
7.5
E40
3.1
15.8
2.9
2.0
2.8
7.3
223.8
7.3
SI
2.2
17.0
1.5
2.0
3.3
0.5
139.5
7.3
0.90
A20
1.8
9.8
1.6
2.1
3.5
1.0
117.5
7.5
A40
2.7
11.3
2.0
3.5
3.4
1.3
178.3
7.5
E20
2.2
19.6
2.6
3.0
2.6
3.4
212.3
7.4
E40
4.0
23.3
3.5
1.8
2.0
8.3
281.5
7.3
SI
1.3
9.2
1.6
4.1
3.5
0.8
183.5
7.3
1Depth of soil solution collection; 2treatments evaluated: SI: no irrigation; E20: treated domestic sewage applied at 0.20 m; E40: treated domestic sewage applied at 0.40 m; A20: surface reservoir water applied at 0.20 m; A40: surface reservoir water applied at 0.40 m. 3Coefficient of variation.
