Sewage Sludge Amendment Combined with Green Manuring to a Coastal Mudflat Salt-Soil in Eastern China: Effects on Soil Physicochemical Properties and Maize Yield

Table 3

Effects of sewage sludge amendment (SSA) combined with green manuring on salinity of coastal mudflat salt-soil.

Year	SSA (t ha^−1)	Salinity ()
		0–20 cm depth	20–40 cm depth
2013	0	7.67 ± 0.11	9.40 ± 0.57
	30	4.76 ± 0.15	8.38 ± 1.01
	75	3.08 ± 0.05	8.48 ± 1.06
	150	2.56 ± 0.25	8.25 ± 1.30
	300	2.06 ± 0.24	7.97 ± 0.82
	-value	491.75	0.90
2014	0	6.33 ± 2.13	9.34 ± 0.27
	30	4.65 ± 0.63	8.14 ± 0.63
	75	4.44 ± 0.07	8.57 ± 1.25
	150	3.50 ± 0.66	8.27 ± 1.27
	300	2.74 ± 0.82	7.75 ± 0.51
	-value	17.96	1.37

Values are mean ± SD of three replicates. Different letters in each column indicate significant difference at by LSD’s multiple range test. Values of are the test in ANOVA; ; ; .