Water Hyacinth’s Extent and Its Implication on Water Quality in Lake Victoria, Uganda

Table 5

Analysis of variance for physicochemical water properties: type III sums of squares.

Main effects	pH	EC (mS/cm)	Turbidity (NTU)	COD (mg/L)	TP (mg/L)	BOD (mg/L)	Temp (OC)	DO (mg/L)	Transparency (meters)
A: environment
Sum of squares	101.1	600.0	9542.0	6037.0	108205.0	3714.2	42.0	84.1	0.4
Df	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0
Mean squares	101.1	600.2	9542	6038	108.2	3714.2	42.0	84.1	0.4
F-ratio	238	0.3	4.6	7.1	1001	98.3	1.8	144	5.1
value	<2e − 16	0.7	0.03	0.009	<2e − 16	<2.2e − 16	0.2	<2.2e − 16	0.03
B: depth
Sum of squares	2.6	11699.0	1132.0	2298.0	5.7	1099.8	29.9	14.5	0.0
Df	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0
Mean squares	1.3	5849.3	566	1149.1	2.8	549.9	14.9	7.2	0.0
F-ratio	3.1	3.3	0.3	1.3	2.6	14.5	0.6	12.4	0.0
value	0.04	0.04	0.8	0.3	0.1	2.361e − 06	0.5	1.371e − 05	1.0
B (interaction)
Sum of squares	0.5	514	2794	4674	3.5	166.2	11.3	0.2	0.0
Df	2	2	2	2	2	2	2	2	2.0
Mean squares	0.2	257.2	1397	2337	122.5	83.1	5.7	0.1	0.0
F-ratio	0.6	0.1	0.7	2.7	144.0	2.2	0.2	0.2	0.0
value	0.6	0.9	0.5	0.1	1.1	0.1	0.8	0.8	1.0
Residual	49	202268	234909	97537	122.5	4309.3	2662	530	3.0
Total (corrected)	153	216	248377	110546	1224	9290	2536.2	629.2	3.4

, , and  = statistically significant at 95%, 99%, and 100%, respectively.