Indirect Estimations of Lentil Leaf and Plant N by SPAD Chlorophyll Meter
Table 2
Correlation coefficients of LNC and N concentration of the entire leaf biomass with lentil performance in the N fertility trial in three stages of vegetative (VG), first pod (FP), and late-pod (LP).
Yield
HI
DTM
%Ndfa
Above ground biomass
Leaf N
Stem
Pod
Year†
Stage
g m−2
%
days
%
DM
N%
mg N plant−1
mg N plant−1
N%
mg N plant−1
N%
mg N plant−1
LNC (%)
2 years
VG
0.49
—
0.45
0.29
—
0.52
—
—
—
—
na‡
na
FP
—
—
—
—
—
—
—
—
—
—
—
—
LP
0.24
—
0.35
—
0.38
—
0.20
0.39
0.47
0.32
0.23
—
2006
VG
—
—
0.43
—
0.29
—
0.33
0.37
—
—
na
na
FP
—
—
—
—
—
0.37
—
—
—
—
—
—
LP
0.25
−0.49
0.35
−0.30
0.61
0.58
0.25
0.45
0.49
0.39
—
—
2007
VG
0.48
0.22
—
—
—
0.46
—
—
0.26
—
na
na
FP
—
—
—
0.29
−0.39
0.32
—
—
0.30
—
—
—
LP
—
0.25
0.29
0.28
−0.22
—
—
—
0.32
—
—
—
Total leaf biomass N%
2 years
VG
—
—
—
—
—
0.28
0.42
0.42
0.64
0.29
na
na
FP
0.37
—
0.43
0.31
−0.23
0.37
—
0.30
0.78
0.21
0.65
—
LP
—
—
0.22
—
—
—
—
0.47
0.53
0.27
0.30
—
2006
VG
—
−0.36
—
—
—
—
0.63
0.63
0.37
0.40
na
na
FP
0.30
−0.31
0.32
0.41
—
—
0.23
0.55
0.66
0.45
0.34
−0.40
LP
—
−0.42
—
−0.44
0.41
0.55
—
0.54
0.67
0.49
0.38
—
2007
VG
0.33
—
—
—
—
0.81
0.36
0.38
0.83
—
na
na
FP
—
—
0.32
0.31
—
0.48
0.33
0.45
0.85
0.33
0.83
—
LP
—
—
0.45
0.35
—
—
—
0.40
0.58
—
—
−0.27
Correlation coefficients for the pooled data over the years (2 years) and for each year separately. ‡Only significant correlation coefficients are presented ( < 0.05).