Table 1.

Seed N, straw N and total N accumulation of maize and pea planted in intercropping or sole cropping, with two N treatments (N0, 0 kg N ha⁻¹; and N1, 225 kg N ha⁻¹ for pea and 450 kg N ha⁻¹ for maize) and three maize densities (D1, 73,600 plants ha⁻¹; D2, 85,900 plants ha⁻¹; and D3, 98,200 plants ha⁻¹ for sole maize; the relative density of intercropped maize (according to the proportion of occupied area in intercropping) was 45,000, 52,500, and 60,000 plants ha⁻¹ for D1, D2, and D3, respectively)^b.

Effect	Maize			Pea
	Seed N	Straw N	Total N accumulation	Seed N	Straw N	Total N accumulation
	kg ha−1
Year
2012	150	43	193	87	64	151
2013	107	96	202	84	45	129
2014	135	75	210	79	62	142
LSD(0.05)	56	59	37	16	35	39
Cropping system
Intercropping	118	57	175	70	46	116
Sole cropping	143	86	229	124	89	214
LSD(0.05)	43	21	99	37	41	73
Nitrogen rate
N0	108	38	146	74	50	124
N1	153	105	257	93	64	157
LSD(0.05)	34	52	57	12	11	24
Maize density
D1	114	64	178	70	57	127
D2	132	74	206	73	48	121
D3	146	77	222	67	34	101
LSD(0.05)	16	7	18	5	10	15
	P > F
Year (Y)	NSa	NS	NS	NS	NS	NS
Cropping system (C)	0	0.019	0.002	0.001	0.004	0.007
Nitrogen rate (N)	0	0.001	0.013	0.011	0.001	0.001
Maize density (D)	0.002	0.041	0.029	0.021	0.013	0.033
C × N	NS	NS	NS	NS	NS	NS
N × D	NS	NS	NS	NS	NS	NS
D × C	NS	NS	0.039	NS	NS	NS

^aNS, not significant at the 0.05 probability level. ^bValues are means (n = 3).