. 2021 May 20;12:661054. doi: 10.3389/fpls.2021.661054

TABLE 7.

Nitrate content in the basal root pealed skin and woody part of soybeans (μg g^–1 FW).

Treatments		Nitrogen concentration (mg L^–1)	Phase I		Phase II		Phase III
			N+	N–	N+	N–	N+	N–
Pealed skin	N_TTT	0–0–0	69.0 ± 2.26^b	69.0 ± 2.26^b	64.4 ± 2.47^c	64.4 ± 2.47^b	73.6 ± 2.55^c	73.6 ± 2.55^b
	N_HHH	100–100–100	592.0 ± 26.95^a*	186.4 ± 15.38^a	546.3 ± 29.84^a*	172.1 ± 24.75^a	472.8 ± 28.93^a*	99.3 ± 6.53^ab
	N_HTT	100–0–0			306.6 ± 27.75^b*	182.8 ± 10.26^a	196.2 ± 13.12^b*	103.2 ± 6.15^ab
	N_HTH	100–0–100					456.8 ± 4.72^a*	119.8 ± 13.32^a
Woody part	N_TTT	0–0–0	14.4 ± 2.70^b	14.4 ± 2.70^b	15.9 ± 2.28^c	15.9 ± 2.28^b	19.0 ± 2.89^c	19.0 ± 2.89^b
	N_HHH	100–100–100	86.7 ± 12.83^a*	42.0 ± 4.23^a	280.0 ± 14.93^a*	34.4 ± 3.79^a	274.1 ± 5.28^a*	58.1 ± 3.95^a
	N_HTT	100–0–0			76.0 ± 1.27^b*	30.2 ± 2.66^a	53.3 ± 6.72^b	50.1 ± 3.91^a
	N_HTH	100–0–100					272.2 ± 7.93^a*	77.2 ± 10.93^a

The treatments and N concentrations are described in Table 1. Values are means ± standard error (n = 3). Different lowercase letters indicate a significant difference between the treatments at the 5% level (Duncan’s test) by longitudinal comparison.*Indicates a significant difference between the N+ and N– sides under the same treatment at the 5% level by horizontal comparison.