Table 2. Exponential equations simulating the influences of different P fertilization methods on soil P downward movement (Olsen-P, mg kg⁻¹).

P form	Application method	Loam soil				Clay soil
		Equation	K (mm−1)	Half-depth (mm)	R2	Equation	K (mm−1)	Half-depth (mm)	R2
MAP	Single	y = 192.03e−0.059x + 19.07	0.059	11.8	0.97	y = 216.05e−0.056x + 10.45	0.056	12.49	0.98
	Repeated	y = 144.70e−0.053x + 24.70	0.053	13.1	0.94	y = 155.72e−0.040x + 7.38	0.040	17.45	0.96
PA	Single	y = 152.68e−0.105x + 17.12	0.105	6.57	0.87	y = 153.98e−0.059x + 13.12	0.059	11.72	0.98
	Repeated	y = 181.36e−0.063x + 20.94	0.063	10.9	0.90	y = 151.40e−0.040x + 8.10	0.040	17.56	0.97
APP	Single	y = 187.05e−0.056x + 17.25	0.056	12.3	0.97	y = 286.92e−0.060x + 10.58	0.060	11.51	0.81
	Repeated	y = 785.95e−0.044x + 12.65	0.044	15.9	0.99	y = 471.57e−0.023x − 40.17	0.023	29.77	0.94

Note:

Data were presented as the mean value of three replicates and standard deviation (SD) at a significance level of p < 0.05.