Testing deep placement of an 15N tracer as a method for in situ deep root phenotyping of wheat, barley and ryegrass

Table 3 Variations in grain N content and grain yield for different genotypes and species in three experiments

Exp	Species	Genotype	Grain yield (Mg DM ha⁻¹)		Grain N content (kg ha⁻¹)
Exp	Species	Genotype	0.87–1.74 m soil depth	1.74–2.61 m soil depth	0.87–1.74 m soil depth	1.74–2.61 m soil depth
1	Winter wheat	Hystar	9.3 a	7.7 a	95.7 a	81.2 a
1	Winter wheat	Tabasco	8.0 b	6.4 a	96.7 a	76.5 a

Exp	Species	Genotype	0.53–1.09 m soil depth	1.09–1.66 m soil depth	0.53–1.09 m soil depth	1.09–1.66 m soil depth
2	Spring barley	Evelina	4.6 a	3.8 a	54.2 a	44.6 b
2	Spring barley	Laurikka	5.5 a	5.3 a	64.5 a	62.0 a

Exp	Species	Genotype	0.87–1.74 m soil depth	1.74–2.61 m soil depth	0.87–1.74 m soil depth	1.74–2.61 m soil depth
3	Spring barley	Laurikka	6.1 ab	6.5 a	73.9 a	81.3 ab
		Kenia	5.4 b	5.3 b	71.0 a	67.9 b
		Evergreen	6.0 ab	7.1 a	73.3 a	92.4 a
		Evelina	6.4 ab	6.7 a	89.9 a	93.0 a
		Invictus	7.0 a	7.5 a	83.6 a	96.4 a
		Prisma	6.1 ab	7.0 a	72.9 a	86.5 a
		Tocada	7.3 a	7.6 a	85.2 a	94.4 a

Grain N content and grain yield were measured for crops that grew at different soil depths. Different lowercase letters indicate significant genotypic differences at P < 0.05

ISSN: 1746-4811