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Table 6 Principal component analysis (PCA) result with factor loadings of the different soil parameters from the study sites

From: Effect of shifting cultivation and fallow on soil quality index in Mokokchung district, Nagaland, India

Site

SCS

FL-3

FL-7

FL-12

Principal Component

PC-1

PC-2

PC-3

PC-1

PC-2

PC-3

PC-1

PC-2

PC-1

PC-2

Eigen value

5.63

1.33

1.02

5.82

1.16

1.03

5.92

1.47

5.59

1.165

%Variance

56.37

13.34

10.26

58.278

11.635

10.357

59.23

14.78

55.91

16.55

%Cumulative frequency

56.37

69.71

79.97

58.278

69.912

80.269

59.23

74.02

55.91

72.47

Factor loadings

 CEC

0.852

0.226

0.344

0.604

0.438

0.457

0.306

0.845

0.886

0.319

 EC

0.845

0.134

0.007

0.799

− 0.038

0.463

0.069

0.829

0.402

0.565

 Moisture

0.782

0.123

0.408

0.249

0.854

0.198

0.445

0.782

0.896

0.301

 Pav

0.737

0.484

− 0.112

0.731

0.498

0.233

0.875

0.279

0.393

0.736

 Kex

0.672

0.602

0.167

0.362

0.804

0.279

0.681

0.615

0.871

0.360

 Nav

0.595

0.553

0.394

0.775

0.349

− 0.046

0.830

0.200

0.296

0.769

 BD

− 0.365

− 0.857

− 0.035

− 0.814

− 0.366

0.023

0.248

− 0.842

− 0.630

-0.570

 SOC

0.048

0.845

0.400

0.891

0.300

0.092

0.798

0.168

− 0.237

0.899

 Clay

− 0.003

0.152

0.888

0.208

0.763

− 0.095

0.757

0.175

0.507

0.491

 pH

0.326

0.144

0.667

0.063

0.110

0.905

0.732

0.320

0.791

-0.116

  1. Bold indicates the highest loaded factors in their respective columns which are retained for minimum data set (MDS). PC-1 (Principal Component one), PC-2 (Principal Component two) and PC-3 (Principal Component three). Cation exchange capacity (CEC), electrical conductivity (EC), soil moisture (Moisture), available phosphorus (Pav), exchangeable potassium (Kex), available nitrogen (Nav), bulk density (BD), soil organic carbon (SOC), soil clay content (Clay) and soil pH (pH). SCS (shifting cultivation site), FL-3 (Fallow land 3), FL-7 (Fallow land 7) and FL-12 (Fallow land 12)