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

Table 1

Average leaf N concentration (LNC), specific leaf N (SLN), and specific leaf weight (SLW) of lentil at three growth stages of vegetative growth (VG), first-pod (FP), and late-pod (LP) under three N fertility treatments (top) and two NT duration treatments (bottom) in 2006 and 2007.

Year	Treatments	LNC			SLW			SLN
		(%)			(g DW m^−2 leaf)			(g N m^−2 leaf)
		VG	FP	LP	VG	FP	LP	VG	FP	LP
Fertility study
2006	Control	4.5a	4.0c	3.8a	41b	50b	50bc	1.6b	1.6d	1.9a
	N fertilizer	4.6a	4.3b	4.1a	39b	47b	48c	1.6b	1.8c	1.9a
	Inoculant	4.5a	4.1c	3.9a	42b	49b	46c	1.6b	1.7c	1.8a
	Average	4.5A	4.1B	3.9A	41A	49B	48B	1.6A	1.7B	1.9A
2007	Control	3.6c	4.7a	3.1b	45a	56a	56a	1.6b	2.7a	1.7ab
	N fertilizer	4.0b	4.0c	2.8bc	41b	55a	52ab	1.6b	2.4b	1.4b
	Inoculant	4.2b	4.5a	2.9c	44a	56a	49b	1.8a	2.6a	1.4b
	Average	3.9B	4.4A	3.0B	43A	57A	52A	1.7A	2.6A	1.5B
NT study
2006	LT	4.7b	3.6ab	1.8b	41ab	46a	56a	1.9b	1.7b	1.1ab
	ST	4.9a	4.0a	2.3a	45a	48a	51ab	2.3a	1.8b	1.3a
	Average	4.8A	3.8A	2.1A	43A	47A	53A	2.2A	1.7B	1.2A
2007	LT	4.5b	3.4b	1.8b	39b	47a	49b	1.7c	2.1a	1.0a
	ST	4.4b	3.0c	1.9ab	38b	43b	54ab	1.7c	2.2a	1.1a
	Average	4.4A	3.1B	1.8B	39A	46A	52A	1.7B	2.1A	1.0A

Means followed by different small letters within columns within each study indicate significant effects of the fertility treatments (top) and the NT treatments (bottom) in the two years of the studies ( < 0.05).
Means followed by different capital letters within columns within each study indicate significant effects of the year in each study ( < 0.05).