Table 2 Seed yield (13.5% moisture), concentration of protein and oil in seed, and relative abundance of ureides at R6 (RAU_R6) for soybean crops in the Midwest of US.

From: Interplay between nitrogen fertilizer and biological nitrogen fixation in soybean: implications on seed yield and biomass allocation

Group	Site	Control				N at sowing				N at V4				N at R2				Average (n = 12)
		Seed Yield	Protein	Oil	RAU_R6	Seed Yield	Protein	Oil	RAU_R6	Seed Yield	Protein	Oil	RAU_R6	Seed Yield	Protein	Oil	RAU_R6	Seed Yield	Protein	Oil	RAU_R6
		kg ha^–1	g 100 g^–1		%	kg ha^–1	g 100 g^–1		%	kg ha^–1	g 100 g^–1		%	kg ha^–1	g 100 g^–1		%	kg ha^–1	g 100 g^–1		%
High	Devils Lake	3349	40.2	17.3	93	3445	41.6	16.7	84	3482	40.0	17.7	85	3296	40.8	17.6	73	3393 ± 111	40.6 ± 6	17.3 ± 0.55	84 ± 6
	Vincent	5717	36.3	20.9	91	5997	36.2	20.7	87	6044	34.7	20.7	86	6137	35.7	20.6	89	5974 ± 169	35.7 ± 2	20.7 ± 0.38	88 ± 2
	Pocahontas	5023	37.1	21.1	90	5117	36.9	21.3	88	4964	35.6	20.8	88	5155	36.9	20.3	89	5060 ± 183	36.6 ± 2	20.9 ± 0.38	89 ± 2
	Britt	5348	36.8	20.9	89	5211	35.7	21.3	84	5118	37.1	21.0	83	5234	36.5	20.9	87	5228 ± 212	36.5 ± 2	21.0 ± 0.54	86 ± 2
	Thayer	5069	36.2	21.8	88	4855	37.7	21.3	74	4978	36.8	20.7	68	4773	38.7	21.3	42	4919 ± 285	37.3 ± 12	21.3 ± 0.47	68 ± 12
	Tipton	4614	40.4	20.6	88	4529	39.8	21.1	86	4247	40.9	20.8	80	4466	40.6	20.7	66	4464 ± 109	40.4 ± 6	20.8 ± 0.55	80 ± 6
Medium	Fargo	3344	38.7	20.7	87	3451	39.2	20.2	76	3634	38.1	20.8	68	3459	38.6	20.2	83	3472 ± 81	38.6 ± 6	20.5 ± 0.36	78 ± 6
	Effingham	4405	40.5	22.0	85	4435	39.9	21.7	86	4445	40.2	21.6	84	4478	38.6	22.0	79	4441 ± 343	39.8 ± 6	21.8 ± 0.46	84 ± 6
	Attica	4902	38.3	21.2	84	4902	38.1	21.1	83	5268	40.4	20.7	77	5206	38.7	21.5	80	5070 ± 159	38.9 ± 6	21.1 ± 0.36	81 ± 6
	Owensboro	4731	38.6	21.2	81	4618	36.5	21.1	86	4698	39.4	20.4	75	4471	39.5	21.4	76	4628 ± 137	38.5 ± 5	21.0 ± 0.48	80 ± 5
	Portland	4803	36.8	22.4	81	4921	37.1	21.7	78	5116	40.5	21.3	74	4856	38.9	22.3	56	4924 ± 148	38.3 ± 9	22.0 ± 0.74	72 ± 9
	Mayville	4260	35.1	19.9	80	4314	36.7	20.1	72	4263	36.8	19.7	64	4569	35.1	20.5	67	4352 ± 101	35.9 ± 5	20.1 ± 0.33	70 ± 5
	Clarksdale	5431	38.7	22.1	79	4965	37.4	21.9	82	5229	37.9	21.6	73	5229	37.6	21.9	71	5237 ± 326	37.9 ± 8	21.9 ± 0.68	76 ± 8
	Wamego	5448	37.2	20.2	79	4529	35.9	20.8	49	5298	37.3	20.3	70	5233	36.9	20.5	59	5127 ± 328	36.8 ± 10	20.4 ± 0.47	64 ± 10
	Blencoe	5466	35.6	21.2	77	5304	34.2	21.8	72	5513	35.2	21.4	75	5383	34.4	21.8	77	5416 ± 86	34.9 ± 4	21.5 ± 0.38	75 ± 4
	Le Sueur	4524	36.1	21.4	77	5042	34.5	22.4	77	4625	31.9	23.0	68	4996	36.2	21.6	70	4775 ± 351	34.7 ± 5	22.1 ± 0.69	73 ± 5
	West Salem	5826	37.4	23.0	73	5634	40.1	21.3	66	5667	39.6	22.2	51	5729	39.9	21.9	60	5714 ± 188	39.2 ± 6	22.1 ± 0.47	62 ± 6
	Holloway	5166	35.2	21.7	72	6150	35.7	21.7	65	6060	39.2	19.9	60	6204	36.9	21.2	57	5880 ± 415	36.7 ± 5	21.2 ± 0.61	64 ± 5
Low	Beaver Dam	5132	—	—	72	5304	—	—	62	5094	—	—	55	5307	—	—	72	5209 ± 232	—	—	65 ± 6
	Springfield	4911	38.4	20.2	69	4602	37.7	22.3	63	4784	36.5	22.4	56	4730	36.7	22.5	59	4757 ± 171	37.3 ± 8	21.9 ± 0.73	62 ± 8
	Ithaca	4128	36.9	21.3	60	3976	36	20.7	68	3934	36.0	21.2	73	4566	35.5	20.4	60	4151 ± 230	36.1 ± 8	20.8 ± 0.32	65 ± 8
	Pierre	6201	33.1	23.9	57	6232	33.8	23.0	46	6248	36.1	22.4	63	6326	34.5	23.3	56	6252 ± 259	34.4 ± 6	23.1 ± 0.47	56 ± 6
	Van Wert	4979	40.1	20.6	48	4913	40.4	20.8	57	5282	41.0	20.6	54	5204	41.8	20.2	53	5094 ± 130	40.8 ± 4	20.5 ± 0.46	54 ± 4

Nitrogen treatments are Control, N at sowing, N at V4, and N at R2. Averages for each site include the 95% confidence intervals. Sites are grouped in three classes: high BNF (>75th quartile), medium BNF (25th-75th quartiles), and low BNF (<25th quartile). Within each group, sites are ranked from high to low RAU_R6.

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Table 2 Seed yield (13.5% moisture), concentration of protein and oil in seed, and relative abundance of ureides at R6 (RAU_R6) for soybean crops in the Midwest of US.

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