Table 1. Descriptive statistics for total carbon (C), total N, ash content, major nutrients and potential contaminants of all organic amendment (OA) samples used for the calibration and validation of pXRF and DRIFT-MIR methods.

						Percentile
Property	Units	Mean	Std dev.	Min	Max	2.5th	25th	50th	75th	97.5th
Ash	%	63.8	21.5	11.6	94.9	16.0	52.8	70.1	81.5	88.8
Total C	%	19.4	11.8	1.23	44.7	5.30	9.95	15.8	27.5	43.5
Total N	%	1.65	1.32	0.02	5.41	0.40	0.75	1.11	2.29	5.27
P	%	0.64	0.85	0.06	3.40	0.08	0.13	0.19	0.99	3.00
K	%	0.82	0.77	0.07	4.06	0.10	0.35	0.60	1.01	2.87
Ca	%	1.99	2.73	0.25	21.14	0.37	0.64	0.86	2.87	8.50
Al	%	1.95	1.36	0.01	8.97	0.02	0.87	1.84	2.71	4.28
Mg	%	0.39	0.34	0.13	2.79	0.14	0.24	0.31	0.43	1.29
Na	%	0.14	0.73	0.00	7.21	0.01	0.01	0.02	0.06	0.44
S	%	0.33	0.38	0.03	1.74	0.04	0.08	0.14	0.57	1.31
Mn	%	0.05	0.05	0.01	0.45	0.02	0.04	0.05	0.06	0.09
Fe	%	2.38	2.78	0.05	24.96	0.09	1.18	1.79	2.83	6.64
Zn	mg kg-1	571	1151	41	6553	43	63	92	432	3828
Cu	mg kg-1	278	762	10	5080	11	17	23	143	1413
Ni	mg kg-1	70	142	3.0	1015	3.4	21	29	46	474
Cd	mg kg-1	8.2	25	0.1	137	0.2	0.9	1.5	2.2	108
Pb	mg kg-1	129	310	0.2	1398	0.5	5.3	8.3	35	1263