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

Table 5

Grain Zn concentration (mg kg⁻¹) and accumulation (g ha⁻¹) of durum wheat as affected by tillage system, crop rotation, and P fertilization on at two sites over 3 years.

		Grain Zn concentration (mg kg^−1)						Grain Zn accumulation (g ha^−1)
		BRC-North			MZTRF			BRC-North			MZTRF
		2001	2002	2003	2001	2002	2003	2001	2002	2003	2001	2002	2003
Tillage
Conventional		38.0	26.6	23.7	35.6	37.0	25.3	68.2	82.4	65.9	116.9	119.3	74.6
Reduced		40.1	26.0	26.3	37.4	35.6	24.9	75.5	74.2	82.9	120.9	126.6	72.1
LSD		1.9	1.3	2.5	1.8	2.3	1.5	4.7	6.5	13.9	5.9	8.9	6.4
Crop rotation
wheat-flax-durum		39.5	26.2	25.7	36.9	36.2	26.1	72.0	74.9	77.1	119.6	123.1	77.3
Canola-flax-durum		38.7	26.5	24.3	36.1	36.4	24.1	71.7	81.7	71.7	118.3	122.8	69.3
LSD		1.9	1.3	2.5	1.8	2.3	1.5	4.7	6.5	13.9	5.9	8.9	6.4
P fertilization
0-0-25		37.9	27.4	24.9	38.0	35.7	25.6	71.9	82.3	76.1	125.1	118.1	74.8
0-25-0		42.3	27.4	26.5	37.4	38.7	27.4	73.2	77.6	73.4	123.0	121.0	80.6
25-0-25		39.8	25.6	23.7	37.1	34.9	23.8	72.8	74.7	71.1	119.4	124.1	69.3
25-25-0		39.4	26.9	26.7	35.7	37.0	26.1	72.2	82.9	79.3	112.0	122.5	74.7
50-0-25		37.9	25.0	23.4	35.7	34.3	23.0	71.4	73.5	71.8	116.5	121.1	68.4
50-25-0		37.3	25.6	24.8	35.2	37.0	24.6	69.5	78.8	74.8	117.6	130.7	72.1
LSD		3.3	2.2	4.3	3.1	4.1	2.6	8.2	11.3	24.1	10.3	15.4	11.2
Analysis of variance
Source	DF	Pr ≥ F
Tillage	1	0.036	n.s.	0.034	0.043	n.s.	n.s.	0.003	0.014	0.018	n.s.	n.s.	n.s.
Crop rotation	1	n.s.	n.s.	n.s.	n.s.	n.s.	0.013	n.s.	0.042	n.s.	n.s.	n.s.	0.015
P fertilization	5	0.034	n.s.	n.s.	n.s.	n.s.	0.015	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.