Distribution of nickel in different agro-climatic zones of Jharkhand, India

Figures & data

Figure 1. Study area location map.

Table 1. DTPA-extractable Ni contents (mg kg⁻¹) in soils of different topo-sequences (agro-climatic zones) of Jharkhand.

Agro-climatic zone	Topography	Range	Mean	S.D
IV Zone, i.e., Central and north-eastern plateau	Upland	147–297	200.84	43.88
	Medium	291–371	307.16	26.16
	Lowland	351–472	419.12	38.35
V Zone, i.e., Western plateau	Upland	122–156	141.32	9.95
	Medium	167–347	263.56	60.50
	Lowland	253–486	348.88	62.93
VI Zone, i.e., South eastern plateau	Upland	93–297	173.12	56.21
	Medium	219–367	275.2	41.26
	Lowland	421–630	528.92	66.89

Table 2. Total Ni contents (mg kg⁻¹) in soils of different topo-sequences (agro-climatic zones) of Jharkhand.

Agro-climatic zone	Topography	Range	Mean	S.D
IV Zone, i.e., Central and north-eastern plateau	Upland	0.06–2.08	0.83	0.58
	Medium	0.06–2.50	1.08	0.53
	Lowland	0.38–1.54	1.10	0.29
V Zone, i.e., Western plateau	Upland	0.06–0.68	0.20	0.18
	Medium	0.06–1.48	0.64	0.32
	Lowland	0.52–2.20	1.58	0.42
VI Zone, i.e., South eastern plateau	Upland	0.76–3.10	1.58	0.70
	Medium	0.06–3.42	1.52	0.78
	Lowland	0.84–4.46	2.38	1.13

Figure 2. (a) 3D representation of available and total Ni content in agro-climatic zone IV. (b) 3D representation of available and total Ni content in agro-climatic zone V. (c) 3D representation of available and total Ni content in agro-climatic zone VI.

Table 3. Predictability of available and total content of Ni with relation to soil characteristics Figure in parenthesis indicates S.E. of coefficient.

	Stepwise multiple regression equation	R^2 × 100
Available Ni	Y = 1.6916–0.255 X1* + 0.00375X2** (0.0487) (0.0008)	45.09
	Y = 1.828–0.2322X1** (0.0559)	25.25
Total Ni	Y = 241.06 + 31.78 X3** (8.7294)	20.63

* level of significance at p=0.05% , ** level of significance at p = 0.01% and X₁, X₂, X₃, X₄, X₅, X₆ and X₇ indicate pH, EC, Organic carbon, CaCO₃, silt, clay and CEC, respectively.