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).