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Table 3 Barycenter’s coordinates of the supplementary qualitative variable levels in the first two Principal Components (PC1, PC2)

From: Individuation of the best agronomic practices for organic durum wheat cultivation in the Mediterranean environment: a multivariate approach

Factor

Level

Coordinate

PC1

PC2

Growing season

2018

0.60

0.75

 

2019

 − 0.60

 − 0.75

Variety

Cappelli

1.23

 − 0.73

 

Old Saragolla

 − 0.19

 − 0.49

 

Marco Aurelio

 − 0.75

1.28

 

Nadif

 − 0.29

 − 0.07

Organic fertilizer

CTR

0.10

0.09

 

CTR + N

0.23

 − 0.17

 

CTR + S

 − 0.12

 − 0.13

 

CTR + NS

 − 0.21

0.20

Selenium application

Se0

0.05

 − 0.24

 

Se60

 − 0.05

0.24

  1. Significant values are reported in bold
  2. CTR, control; CTR + N, control plus N foliar application; CTR + S, control plus S foliar application; CTR + NS, control plus N and S foliar application; Se0, no selenium application; Se60, one foliar application of sodium selenate