Table 4.

P acquisition efficiency by roots (RPAE) at anthesis, shoot P utilization efficiency (Shoot PUE) at vegetation and anthesis stages, and grain P utilization efficiency (Grain PUE) at maturity stage for SJZ8 and KN92 in 2010 and 2011.

Year	P level	RPAE-Anthesis		Shoot PUE-Vegetation		Shoot PUE-Anthesis		Grain PUE-Maturity
	(kg ha-1)	(g P kg-1 RDW)		(kg SDW kg-1 P)		(kg SDW kg-1 P)		(kg GY kg-1 P)
		SJZ8	KN92	SJZ8	KN92	SJZ8	KN92	SJZ8	KN92
2010	0	12.1 ± 0.46	13.0 ± 1.20	472 ± 14	524 ± 11	472 ± 20	446 ± 32	327 ± 5	269 ± 4
	25	16.7 ± 0.69	14.9 ± 0.80	479 ± 55	519 ± 21	460 ± 12	442 ± 9	304 ± 9	263 ± 6
	50	18.6 ± 1.10	17.4 ± 0.40	455 ± 13	460 ± 40	452 ± 4	434 ± 12	301 ± 8	253 ± 11
	100	19.5 ± 1.67	20.2 ± 0.71	392 ± 13	366 ± 12	414 ± 5	415 ± 13	284 ± 6	246 ± 7
	200	19.2 ± 1.11	23.5 ± 1.41	374 ± 26	335 ± 18	410 ± 9	388 ± 11	275 ± 6	236 ± 3
	400	20.8 ± 0.61	24.3 ± 0.73	292 ± 18	274 ± 7	401 ± 17	359 ± 12	263 ± 8	220 ± 8
2011	0	6.5 ± 0.26	7.1 ± 0.31	665 ± 21	678 ± 57	790 ± 22	690 ± 37	407 ± 10	347 ± 19
	25	–	–	599 ± 13	622 ± 38	642 ± 18	610 ± 33	367 ± 13	313 ± 16
	50	18.8 ± 1.28	14.4 ± 0.72	536 ± 36	579 ± 9	583 ± 17	556 ± 34	330 ± 22	294 ± 8
	100	17.6 ± 0.93	19.9 ± 1.85	420 ± 51	464 ± 27	543 ± 21	495 ± 31	320 ± 7	266 ± 7
	200	–	–	399 ± 12	358 ± 10	521 ± 15	472 ± 17	296 ± 7	260 ± 5
	400	21.8 ± 0.30	21.4 ± 0.42	319 ± 19	299 ± 8	466 ± 30	440 ± 28	270 ± 10	262 ± 3
Year (Y)		∗		∗∗		∗∗∗		∗∗∗
Cultivar (C)		ns		ns		ns		∗∗∗
P level (P)		∗∗∗		∗∗∗		∗∗∗		∗∗∗
Y × C		ns		ns		ns		ns
Y × P		ns		∗		∗∗∗		∗∗
C × P		ns		ns		ns		ns
Y × C × P		ns		ns		ns		ns

Values are means ± SE of four replicates. ns, ^∗, ^∗∗, and ^∗∗∗ indicate no significant difference and significant difference at P < 0.05, 0.01, and 0.001 level, respectively.