Fly Ash and Composted Biosolids as a Source of Fe for Hybrid Poplar: A Greenhouse Study

Table 1

Selected chemical properties of Albuquerque biosolids and APS fly ash.

Characteristic	Composted biosolids	Fly ashb
pH (1 : 2)c	7.4	12.4
EC (dS m^−1)d	14.0	6.7
SAR (mmol L^−1)d	4.75	2.04
NO3-N (mg kg^−1)e	71.3	2.71
TKN (mg kg^−1)f	1850.0	NT
P (mg kg^−1)c	231.3	17.0
K (mg kg^−1)c	5723.3	11.7
Zn (mg kg^−1)c	44.9	0.6
Fe (mg kg^−1)c	420.3	78.4
Fe by DTPA (mg kg^−1)z	329.0	60.90
Mn (mg kg^−1)c	20.6	8.1
Cu (mg kg^−1)c	15.0	1.2
Ca (mg kg^−1)c	3557.0	5650.0
Mg (mg kg^−1)c	657.7	31.0
Na (mg kg^−1)c	855.3	53.6
S (mg kg^−1)e	529.5	306.7
Al (mg kg^−1)e	807.2	348.7
As (mg kg^−1)e	18.5	10.3
B (mg kg^−1)e	40.1	59.5
Ba (mg kg^−1)e	211.8	904.1
Be (mg kg^−1)e	ND	ND
Cd (mg kg^−1)e	2.3	1.3
Co (mg kg^−1)e	3.4	0.8
Cr (mg kg^−1)e	13.9	2.9
Mo (mg kg^−1)e	ND	ND
Ni (mg kg^−1)e	8.6	1.9
Pb (mg kg^−1)e	18.8	5.0
Se (mg kg^−1)e	ND	ND
Tl (mg kg^−1)e	ND	ND
V (mg kg^−1)e	22.1	8.4
Bi (mg kg^−1)e	ND	ND
Li (mg kg^−1)e	8.6	3.8
Sr (mg kg^−1)e	163.8	37.9
Si (mg kg^−1)e	322.7	308.7
Ag (mg kg^−1)e	5.2	ND

aMean of 6 samples for pH, P, K, Zn, Fe, Mn, Cu, Ca, Mg, and Na.
bMean of 3 samples for S, Al, As, B, Ba, Be, Cd, Co, Cr, Mo, Ni, Pb, Se, Tl, V, Bi, Li, Sr, Si, and Ag.
cAnalyzed at Soil Chemistry Research Laboratory, NMSU, Las Cruces, NM.
dAnalyzed at Agricultural Testing and Research Laboratory, NAPI, Farmington, NM.
eAnalyzed at the NMSU Soil, Water, and Air Testing Laboratory, Las Cruces, NM.
fLiterature value supplied by Glass (personal communication, 2006).
ND = not detected. NT = not tested.