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Table 3 Factor loading matrix of principle components reserved of cotton agronomic traits under different nitrogen conditions

From: Identification and screening of nitrogen-efficient cotton genotypes under low and normal nitrogen environments at the seedling stage

Index Low nitrogen Normal nitrogen
Principal component 1 Principal component 2 Principal component 3 Principal component 1 Principal component 2 Principal component 3
SPAD −0.28 − 0.32 0.37 − 0.33 0.31 0.75
Height 0.73 0.40 −0.045 0.69 0.27 −0.36
ADW 0.88 0.29 −0.06 0.89 0.32 −0.045
RDW 0.79 0.46 0.076 0.77 0.49 0.15
TDW 0.90 0.37 −0.012 0.90 0.40 0.02
ANU 0.74 −0.59 −0.33 0.91 −0.30 − 0.063
RNU 0.44 0.079 0.84 0.65 −0.15 0.49
TNU 0.85 −0.52 0.002 0.95 −0.29 0.066
NUtE −0.053 0.95 −0.14 −0.19 0.96 −0.11
NUpE 0.85 −0.52 0.001 0.95 −0.30 0.071
Eigenvalue 5.00 2.47 0.98 5.86 1.88 0.98
Variance contribution rate 50.01 24.70 9.82 58.64 18.81 9.76
Cumulative percentage 50.01 74.72 84.54 58.64 77.45 87.22