Effect of nitrogen fertilizer rates on grain yield and nitrogen uptake and use efficiency of bread wheat (Triticum aestivum L.) varieties on the Vertisols of central highlands of Ethiopia

Table 5 Interaction effect of N rate and variety on nitrogen concentration of straw and grain of bread wheat at Enewari, central highland of Ethiopia

Variety	Straw nitrogen concentration (%)
	N rate (kg ha⁻¹)
	0	120	240	360
Menze	0.14ef	0.28bc	0.30ab	0.34a
Tsehay	0.11f	0.23cd	0.32ab	0.35a
ET-13	0.16ef	0.18de	0.26bc	0.23cd
CV (%)		15.03

Variety	Grain nitrogen concentration (%)
Menze	1.89f	1.8f	2.17de	2.3cd
Tsehay	1.86f	2.06e	2.43bc	2.7a
ET-13	1.75f	1.78f	2.17de	2.48b
CV (%)		4.49

Means followed by the same letter are not significantly different from each other at 5% level of significance according to Duncan’s multiple range test