Effect of Phosphogypsum Amendment on Chemical Properties of Sodic Soils at Different Incubation Periods

Table 2

Effect of incubation time on chemical properties of sodic soils within PG levels.

GR (%)	IP (day)	pH	Avail. P	Na	K	Ca	Mg	ESP
0	7	9.39^a	2.24^i	8.52^a	1.03^bc	18.03^ghijkl	2.18^f	28.82^cd
	14	9.20^b	2.35^i	8.52^a	1.03^b	13.96^lm	2.53^ab	32.80^ab
	21	9.22^b	2.59^i	8.56^a	1.07^a	14.16^klm	2.62^a	32.58^ab
	28	9.27^ab	2.21^i	8.5^a	1.07^a	12.98^m	2.62^a	34.91^a
	35	9.31^ab	2.19^i	8.51^a	1.07^a	15.19^jklm	2.62^a	31.06^bc
	Mean	9.39^a	2.32^e	8.53^a	14.86^d	1.06^a	2.51^a	32.03^a
50	7	8.35^d	3.47^gh	7.46^b	1.03^bc	20.90^efgh	2.03^g	23.94^fg
	14	8.32^d	3.58^gh	7.46^b	1.03^bc	16.40^ijklm	2.55^ab	27.67^de
	21	8.74^c	3.51^gh	7.45^b	1.07^a	18.37^ghijk	2.62^a	25.36^ef
	28	8.59^c	3.47^gh	7.47^b	1.07^a	16.93^hijklm	2.62^a	26.97^de
	35	8.65^c	3.32^h	7.48^b	1.07^a	23.74^cdef	2.62^a	21.42^g
	Mean	8.53^b	3.47^d	7.47^b	19.27^c	1.06^a	2.49^ab	25.07^b
100	7	7.91^ef	4.45^f	5.53^c	1.0732^a	24.89^bcde	2.21^f	16.56^h
	14	7.69^ghi	4.49^ef	4.73^e	1.03^bc	26.60^bc	2.48^bc	13.63^ijk
	21	7.95^e	4.49^ef	5.33^d	1.03^c	19.87^fghi	2.50^abc	22.78^fg
	28	7.92^ef	4.33^f	4.53^f	1.07^a	21.07^defgh	2.50^abc	15.53^hi
	35	7.83^efg	4.07^fg	4.51^f	1.07^a	20.11^fghi	2.50^abc	15.53^hi
	Mean	7.86^c	4.37^c	4.93^c	22.51^ab	1.06^a	2.44^b	16.90^c
150	7	7.68^ghij	5.49^d	3.46^g	1.03^bc	28.14^b	2.28^ef	10.09^lm
	14	7.36^lmn	5.32^d	3.46^g	1.03^c	25.13^bcd	2.39^cde	10.90^kl
	21	7.75^fgh	5.56^d	3.47^g	1.07^a	17.86^ghijkl	2.39^cde	14.02^hij
	28	7.55^ijk	5.73^d	3.47^g	1.07^a	19.52^ghi	2.39^cde	13.49^ijk
	35	7.51^jkl	5.16^de	5.48^g	1.07^a	18.12^ghijkl	2.39^cde	13.87^hij
	Mean	7.57^d	5.45^b	3.47^d	21.75^b	1.06^a	2.37^c	12.48^d
200	7	7.65^hij	8.36^ab	2.96^h	1.03^bc	33.33^a	2.35^de	7.82^m
	14	7.40^klm	8.64^a	2.97^h	1.03^c	21.87^defg	2.46^bcd	10.44^lm
	21	7.4^klm	7.98^bc	2.97^h	1.07^a	24.75^bcde	2.50^abc	9.49^lm
	28	7.29^mn	8.63^a	2.97^h	1.07^a	18.73^ghij	2.50^abc	11.91^jkl
	35	7.22^n	7.68^c	2.98^h	1.07^a	21.75^defg	2.50^abc	10.51^lm
	Mean	7.39^e	8.26^a	2.97^e	24.09^a	1.06^a	2.46^ab	10.04^e
Treatments (T)					ns
IP
TIP			ns		ns
CV (%)		1.61	9.43	2.51	0.11	16.39	4.06	11.78
LSD0.05		0.17	0.26	0.17	0.01	4.22	0.13	2.86

, , , and ns means significant at , , , and not significant at (). CV is the coefficient of variation. The same letter within the column indicates no significant difference at . LSD is the least significant difference, and IP is the incubation period.