Table 2.

Agronomic use efficiency and partial factor productivity of N as affected by different doses of N fertilizer. Mean values followed by at least one lowercase letter are not significantly different at p < 0.05 by Tukey's HSD test.

Treatments	Agronomic use efficiency (kg yield per kg N)			Partial factor productivity (kg yield per kg N)
	Rice	Maize	System	Rice	Maize	System
N40a	14.9ab	50.6a	40.8ab	97.5a	95.6a	188.7a
N80	19.6a	40.3ab	46.8a	63.8b	59.9b	120.8b
N120	8.0b	43.3ab	41.9ab	59.0c	35.0b	91.2c
N160	9.8ab	43.7a	45.9a	55.5cd	30.0b	82.9c
N200	5.7b	23.4bc	23.5b	32.8d	21.8c	53.1d
N240	5.5b	18.2c	19.1b	26.0d	18.9c	43.7d
Mean	10.6	36.6	36.4	55.8	43.5	96.7

^aThe number after N indicates kg of fertilizer N applied per ha.