Table 2. Aboveground Biomass, N Accumulation, NAE, NPFP, and NUE for Different Treatments in 2016–2018^a.

year	treatment	biomass (kg ha–1)	N accumulation (kg ha–1)	NAE (kg N kg–1)	NPFP (kg N kg–1)	NUE (%)	NUE change relative to CP0 (%)
2016	CK	11,485d	83.1d
	CFF	14,659c	139.2c	10.4d	42.5d	31.2c
	CP0	16,337b	147.6b	13.3c	45.4c	35.9b
	CP1	17,920a	157.3a	18.8a	50.9a	41.3a	15.1
	CP2	17,669a	147.8b	17.0ab	49.1ab	36.0b	0.3
	CP3	16,577b	148.4b	15.8b	47.9b	36.3b	1.2
2017	CK	12,249d	84.6d
	CFF	13,511c	140.3c	2.9c	37.8c	30.9c
	CP0	16,082b	153.5b	10.9b	45.8b	38.3b
	CP1	17,410a	164.8a	15.1a	50.0a	44.6a	16.4
	CP2	16,651ab	152.3b	11.3b	46.2b	37.6b	–1.8
	CP3	16,392b	147.6bc	10.4b	45.3b	35.0bc	–8.6
2018	CK	10,902d	80.9d
	CFF	14,232c	127.4c	9.8c	39.6c	25.8c
	CP0	16,173ab	150.3b	15.7b	45.5b	38.6b
	CP1	17,153a	164.4a	19.6a	49.4a	46.4a	20.2
	CP2	16,671b	148.8b	16.8b	46.6b	37.7b	–2.2
	CP3	15,993b	150.3b	15.5b	45.3b	38.5b	–0.1

^aNote: Means followed by same the lowercase letter within each column in the same year were not significantly different (p > 0.05) based on analysis by one-way ANOVAs followed by Duncan multiple range tests.