Impact of Addition of FGDB as a Soil Amendment on Physical and Chemical Properties of an Alkali Soil and Crop Yield of Maize in Northern China Coastal Plain

Table 8

Selected chemical properties and nutrient (cmol kg⁻¹) concentrations of different FGDB amended soils.

		T0	T1	T2	T3	T4
EC (mMho cm^−1)	d0	0.43 ± 0.003^a	0.43 ± 0.003^a	0.43 ± 0.003^a	0.43 ± 0.003^a	0.43 ± 0.003^a
	d1	0.44 ± 0.002^a	0.46 ± 0.003^a	0.49 ± 0.003^b	0.51 ± 0.002^c	0.53 ± 0.005^d
	d2	0.46 ± 0.003^a	0.47 ± 0.004^a	0.51 ± 0.005^b	0.53 ± 0.004^c	0.55 ± 0.006^d
Total N (%)	d0	0.23 ± 0.004^a	0.23 ± 0.004^a	0.23 ± 0.004^a	0.23 ± 0.004^a	0.23 ± 0.004^a
	d1	0.26 ± 0.004^a	0.29 ± 0.005^b	0.33 ± 0.002^c	0.34 ± 0.004^c	0.37 ± 0.002^d
	d2	0.27 ± 0.003^a	0.31 ± 0.001^b	0.35 ± 0.004^c	0.36 ± 0.002^c	0.40 ± 0.004^d
Available P (cmol kg^−1 soil)	d0	4.16 ± 0.06^a	4.16 ± 0.06^a	4.16 ± 0.06^a	4.16 ± 0.06^a	4.16 ± 0.06^a
	d1	4.64 ± 0.05^a	5.61 ± 0.07^b	5.92 ± 0.04^c	6.42 ± 0.06^d	6.55 ± 0.02^d
	d2	4.87 ± 0.10^a	5.85 ± 0.05^b	6.10 ± 0.06^c	6.56 ± 0.05^d	6.61 ± 0.07^d
K (cmol kg^−1 soil)	d0	0.110 ± 0.017^a	0.114 ± 0.012^a	0.107 ± 0.015^a	0.108 ± 0.013^a	0.113 ± 0.010^a
	d1	0.102 ± 0.008^a	0.049 ± 0.009^c	0.068 ± 0.010^b	0.051 ± 0.008^c	0.071 ± 0.003^b
	d2	0.097 ± 0.007^a	0.024 ± 0.003^c	0.033 ± 0.010^c	0.032 ± 0.002^c	0.047 ± 0.007^b
Na (cmol kg^−1 soil)	d0	3.32 ± 0.02^a	3.28 ± 0.07^a	3.35 ± 0.09^a	3.34 ± 0.04^a	3.29 ± 0.09^a
	d1	3.25 ± 0.06^a	2.41 ± 0.08^b	1.85 ± 0.05^d	2.19 ± 0.01^c	2.46 ± 0.08^b
	d2	3.17 ± 0.07^a	1.32 ± 0.04^c	1.24 ± 0.06^d	1.53 ± 0.02^b	1.50 ± 0.09^b
Ca (cmol kg^−1 soil)	d0	1.26 ± 0.06^a	1.32 ± 0.09^a	1.27 ± 0.05^a	1.23 ± 0.04^a	1.30 ± 0.07^a
	d1	1.31 ± 0.09^e	2.05 ± 0.11^d	4.11 ± 0.24^c	5.93 ± 0.53^b	11.75 ± 0.79^a
	d2	1.19 ± 0.05^e	1.82 ± 0.09^d	3.66 ± 0.18^c	4.89 ± 0.30^b	8.27 ± 0.67^a
Mg (cmol kg^−1 soil)	d0	1.02 ± 0.05^a	1.06 ± 0.08^a	0.99 ± 0.04^a	1.01 ± 0.05^a	1.04 ± 0.03^a
	d1	1.03 ± 0.02^c	1.83 ± 0.01^b	2.01 ± 0.04^a	2.03 ± 0.05^a	2.10 ± 0.07^a
	d2	0.95 ± 0.03^b	1.42 ± 0.04^a	1.47 ± 0.05^a	1.53 ± 0.03^a	1.55 ± 0.06^a
SO4  (cmol kg^−1 soil)	d0	3.67 ± 0.05^a	3.58 ± 0.04^a	3.71 ± 0.02^a	3.60 ± 0.04^a	3.69 ± 0.03^a
	d1	3.56 ± 0.04^e	4.52 ± 0.07^d	7.71 ± 0.08^c	15.93 ± 0.14^b	18.04 ± 0.13^a
	d2	3.48 ± 0.04^d	3.84 ± 0.05^d	6.03 ± 0.05^c	13.36 ± 0.10^b	15.69 ± 0.09^a
ESP (%)	d0	16.30 ± 0.16^a	14.28 ± 0.18^a	14.37 ± 0.17^a	14.28 ± 0.23^a	14.35 ± 0.14^a
	d1	16.47 ± 0.20^a	8.83 ± 0.10^c	8.50 ± 0.11^c	10.64 ± 0.15^b	10.58 ± 0.18^b
	d2	14.26 ± 0.15^a	6.08 ± 0.08^d	6.01 ± 0.13^d	8.34 ± 0.10^b	7.72 ± 0.05^c

d0: initial; d1: at day 180 in 2011; d2: at day 180 in 2012.
Values = mean ± standard deviation of triplicate measurements.
Letters denote statistically significant differences across treatments ().