TABLE 3.

Effect of chemical nitrogen fertilizer amounts on soil chemical properties.

Treatments	pH	SOM(g/kg)	AN(mg/kg)	AP(mg/kg)	AK(mg/kg)	TN(g/kg)	TP(g/kg)	TK(g/kg)
N0	7.95 a ± 0.08	12.70 ab ± 0.10	82.97 a ± 5.45	11.50 c ± 0.50	128.33 a ± 6.03	0.71 a ± 0.01	0.99 a ± 0.02	20.60 b ± 0.75
N75	7.89 ab ± 0.03	12.00 b ± 0.69	78.67 a ± 7.36	17.25 a ± 0.75	108.40 b ± 10.61	0.69 ab ± 0.03	0.99 a ± 0.05	21.47 b ± 0.17
N150	7.85 ab ± 0.02	11.97 b ± 0.15	64.30 b ± 0.70	14.85 b ± 0.75	93.13 c ± 10.33	0.67 b ± 0.03	1.02 a ± 0.04	19.87 b ± 0.21
N225	7.85 ab ± 0.03	14.40 a ± 0.95	58.47 b ± 2.83	14.53 b ± 1.17	92.53 c ± 4.16	0.67 b ± 0.01	1.01 a ± 0.09	20.27 b ± 0.35
N300	7.79 b ± 0.03	13.40 ab ± 2.09	65.93 b ± 2.14	14.63 b ± 1.07	97.80 bc ± 6.02	0.67 b ± 0.02	1.04 a ± 0.01	25.60 a ± 0.44

SOM, is soil organic matter; AN, is available nitrogen; AP, is available phosphorus; AK, is available potassium; TN, is total nitrogen; TP, is total phosphorus; TK, is total potassium; Tables are the mean ± standard error (n = 3).