Cadmium and Zinc Concentration in Grain of Durum Wheat in Relation to Phosphorus Fertilization, Crop Sequence and Tillage Management

Table 1

Soil characteristics of the experimental sites prior to initiation of the study.

Soil property	Soil depth (cm)	BRC North			MZTRF
		2001*	2002	2003	2001	2002	2003
pH	0–15	7.82	8.37	7.83	8.43	7.87	7.54
	15–30	—	—	8.17	—	—	7.71
	30–60	—	—	8.43	—	—	7.95
EC (μS cm^−1)	0–15	290	289	603	261	293	585
	15–30	218	290	537	228	228	495
	30–60	299	419	560	226	276	523
N (mg kg^−1)	0–15	8.34	3.78	2.50	7.92	4.19	7.50
	15–30	3.31	2.56	2.75	3.42	2.03	3.19
	30–60	2.41	3.56	1.17	2.92	1.81	1.81
P (mg kg^−1)	0–15	12.53	11.63	6.75	9.36	11.34	9.94
K (mg kg^−1)	0–15	267	202	259	9.36	298	290
DTPA-Cd (μg kg^−1)	0–15	102.6	73.3	72.0	89.6	134.8	103.6
DTPA-Zn (mg kg^−1)	0–15	0.77	0.60	0.80	1.01	1.08	1.20

*Soil samples were taken in the first phase of the study, prior to seeding the preceding canola and wheat.