The effects of experimental treatments on the distribution of ¹⁵N-urea in different organs of tomato^a.

Irrigation mode	Irrigation quota (m3 ha−1)	Leaf (kg ha−1)	Stem (kg ha−1)	Root (kg ha−1)	Fruit (kg ha−1)
Spray	140	27.6 ± 1.02 c	6.12 ± 0.24 d	2.54 ± 0.08 a	32.4 ± 1.77 bc
	180	28.3 ± 1.03 bc	6.59 ± 0.24 bcd	2.31 ± 0.08 b	34.1 ± 0.41 b
	220	30.0 ± 0.57 abc	7.09 ± 0.22 ab	2.29 ± 0.13 b	34.1 ± 1.78 b
Drip	140	29.4 ± 1.10 abc	6.34 ± 0.18 cd	2.35 ± 0.11 ab	34.2 ± 2.65 b
	180	32.3 ± 3.13 a	7.45 ± 0.27 a	2.21 ± 0.09 bc	44.0 ± 5.59 a
	220	31.4 ± 1.11 ab	6.83 ± 0.31 bc	2.04 ± 0.12 cd	34.4 ± 0.44 b
Flood	140	20.3 ± 1.07 d	4.84 ± 0.28 e	1.82 ± 0.09 d	23.1 ± 0.98 d
	180	21.6 ± 1.57 d	5.24 ± 0.25 e	1.82 ± 0.11 d	25.7 ± 0.36 d
	220	23.4 ± 1.23 d	5.24 ± 0.18 e	1.86 ± 0.10 d	27.6 ± 2.5 cd
Irrigation mode	**	**	**	**
Irrigation quota	*	**	*	*
Mode × quota	ns	*	ns	*

^aIn the same column, means followed by the same letter (a, b, c, d, e) do not differ significantly at 0.05 level, according to Duncan's multiple range test. *, ** and ns indicate that the experimental treatment has a significant (at 0.05 level) effect, an extremely significant (at 0.01 level) effect and no significant effect, respectively on the indicator.