Spatial Distribution and Temporal Variability of Ammonium-Nitrogen, Phosphorus, and Potassium in a Rice Field in Corrientes, Argentina

Table 2

Summary statistics for -N, P, and K concentrations on different sampling dates and liming treatments (Var.: variance; CV: coefficient of variation).

Lime (Kg ha^−1)	Code	Mean (mg kg^−1)	Var.	CV	Minimum (mg kg^−1)	Maximum (mg kg^−1)	Skewness	Kurtosis
Ammonium nitrogen, -N
First sampling
0	NH4-10	20.07^a,A	14.67	19.1	11.16	28.80	−0.047	−0.405
625	NH4-11	28.87^c,B	17.09	14.3	20.42	39.72	0.159	−0.435
1250	NH4-12	27.30^b,A	30.56	20.3	11.62	43.63	0.064	0.856
Second sampling
0	NH4-20	24.73^a,B	15.29	15.8	17.09	35.28	0.319	−0.530
625	NH4-21	27.36^b,A	11.21	12.2	21.43	37.38	0.654	−0.036
1250	NH4-22	28.50^c,B	12.56	12.4	19.79	36.94	0.099	−0.775
Third sampling
0	NH4-30	37.74^a,C	24.14	13.0	28.84	48.52	0.433	−0.820
625	NH4-31	43.92^b,C	31.23	12.7	30.38	55.38	−0.462	−0.251
1250	NH4-32	38.84^c,C	14.25	9.7	29.60	48.54	0.126	−0.033
Phosphorus, P
First sampling
0	P-10	5.52^a,A	1.75	24.0	2.50	8.04	0.041	−0.730
625	P-11	6.72^b,A	2.03	21.2	3.74	10.72	0.450	−0.346
1250	P-12	8.57^c,A	2.60	18.8	5.04	12.33	−0.160	−0.274
Second sampling
0	P-20	10.36^a,C	4.75	21.0	6.61	18.45	1.069	1.562
625	P-21	13.12^b,C	6.50	19.4	7.30	18.43	0.012	−0.670
1250	P-22	11.93^c,C	3.39	15.4	8.72	17.34	0.502	0.037
Third sampling
0	P-30	7.14^a,B	3.39	25.8	3.50	14.26	0.894	1.633
625	P-31	8.67^b,B	2.72	19.1	4.79	13.17	0.194	−0.319
1250	P-32	7.45^a,B	3.02	23.3	4.05	10.69	0.111	−0.883
Potassium, K
First sampling
0	K-10	38.15^a,C	47.95	18.2	26.56	64.64	1.012	1.551
625	K-11	44.41^b,C	36.93	13.7	34.26	65.21	0.822	0.897
1250	K-12	50.41^c,C	35.78	11.9	38.24	70.53	0.380	0.387
Second sampling
0	K-20	32.09^a,B	23.54	15.1	22.01	42.35	0.004	−0.969
625	K-21	36.46^b,B	86.97	25.6	19.86	59.87	0.277	−0.860
1250	K-22	40.44^c,B	57.47	18.8	28.73	59.68	0.355	−0.649
Third sampling
0	K-30	19.41^b,A	7.48	14.1	12.43	25.30	0.019	−0.647
625	K-31	18.01^a,A	5.78	13.4	12.42	23.95	0.137	−0.022
1250	K-32	17.25^a,A	9.56	17.9	11.34	23.23	0.177	−1.038

Mean values followed by different small letters and different capital letters are significantly different () for liming treatment and sampling date, respectively.