Indirect Estimations of Lentil Leaf and Plant N by SPAD Chlorophyll Meter

Table 4

Equations are developed by linear regression to estimate leaf N concentration, using different combinations of SPAD chlorophyll meter reading (SCMR) values, growth stage (Stage), and specific leaf weight (SLW).

Linear model (independent variable)	Coefficient of determination ()
	0.49
	0.54
	0.64
	0.69

Growth stages are 1, 2, and 3 for vegetative, first-pod, and maturity, respectively.