Table 3.

Nitrogen concentrations and allocation in different organs, and N recovery efficiency (NRE, %) of cotton at physiological mature stage as affected by fertilizer treatments in 2015 and 2016.

	N concentration (g N kg−1)					N allocation (%)					NRE (%)
	Straw	Fiber	Hull	Leaf	Seed	Straw	Fiber	Hull	Leaf	Seed
Year
2015	8.6 ± 0.3 b	2.1 ± 0.4	10.2 ± 0.6	11.8 ± 1.0 b	30.8 ± 0.8 a	19.7 ± 1.0 b	2.5 ± 0.5	12.3 ± 1.0	13.9 ± 1.6	51.6 ± 2.4 a	5.6 ± 2.4
2016	15.8 ± 0.8 a	2.7 ± 0.1	11.8 ± 2.1	20.9 ± 0.6 a	23.8 ± 2.1 b	29.4 ± 1.6 a	2.9 ± 0.2	15.3 ± 2.4	10.9 ± 1.0	41.6 ± 2.3 b	4.8 ± 4.2
Treatment
Control	11.8 ± 1.7	2.2 ± 0.2	10.5 ± 2.0	15.0 ± 2.0	27.4 ± 2.5	24.3 ± 2.7	2.5 ± 0.2	14.6 ± 3.6	12.7 ± 2.0	46.0 ± 3.6	—
Urea	12.1 ± 1.5	2.2 ± 0.2	9.4 ± 1.0	16.4 ± 2.0	28.7 ± 2.5	23.9 ± 2.1	2.5 ± 0.3	11.3 ± 2.1	12.2 ± 1.7	50.1 ± 4.1	−0.5 ± 2.3
ESN	12.0 ± 1.3	2.3 ± 0.3	12.5 ± 2.3	17.0 ± 2.2	26.8 ± 2.3	24.3 ± 1.9	2.6 ± 0.3	14.6 ± 2.7	13.4 ± 2.5	45.1 ± 3.5	10.1 ± 4.3
U + DI	13.0 ± 1.9	2.9 ± 0.7	11.7 ± 2.9	16.4 ± 2.2	26.4 ± 3.3	25.7 ± 3.5	3.2 + 0.9	14.7 ± 1.1	11.3 ± 1.6	45.1 ± 3.5	6.0 ± 4.7
ANOVA P values
Year (Y)	0.000	0.183	0.498	0.000	0.010	0.000	0.344	0.716	0.150	0.019	0.806
Treatment (T)	0.783	0.590	0.804	0.853	0.915	0.914	0.698	0.625	0.901	0.793	0.134
Y × T	0.539	0.528	0.946	0.987	0.852	0.362	0.268	0.853	0.754	0.586	0.559

Values are means ±1 standard error, n = 16 for year and n = 8 for treatment.

Means within a column followed by the different letters are significantly different at P = 0.05.