Table 4. Percentage of Zn derived from fertilizer (Zn_dff) in young orange trees 150 days after the application of a Zn-labeled fertilizer (99.0 atom % excess ⁶⁸Zn) in soils with a sandy loam or clay texture.

Soil type	Zn Source			F test a
	ZnSO4	ZnO	Average	Soil	Source	Soil*Source
	Root (% of Zndff)
Sandy loam	99.7 Aa	40.1 Ab	69.9	**	**	**
Clay	42.6 Ba	7.6 Bb	25.1
Average	71.2	23.9
	Trunk (% of Zndff)
Sandy loam	96.3 Aa	25.2 Ab	60.8	*	**	**
Clay	41.2 Ba	11.2 Bb	26.2
Average	68.8	18.2
	Old branches (% of Zndff)
Sandy loam	97.5 Aa	22.1 Ab	59.8	**	**	**
Clay	41.4 Ba	4.3 Bb	22.9
Average	69.5	13.2
	New branches (% of Zndff)
Sandy loam	98.8 Aa	29.8 Ab	64.3	**	**	**
Clay	38.9 Ba	4.8 Bb	21.9
Average	68.9	17.3
	Old leaves (% of Zndff)
Sandy loam	47.7 Aa	0.1 Ab	23.9	**	**	**
Clay	5.2 Ba	0.1 Ab	2.7
Average	26.5	0.1
	New leaves (% of Zndff)
Sandy loam	97.3 Aa	15.8 Ab	56.6	**	**	**
Clay	33.3 Ba	6.5 Bb	19.9
Average	65.3	11.2
	Flowers (% of Zndff)
Sandy loam	60.0 Aa	13.7 Ab	36.9	**	**	*
Clay	26.8 Ba	2.7 Bb	14.8
Average	43.4	8.2
	Young fruits b (% of Zndff)
Sandy loam	83.7 Aa	21.8 Ab	52.8	**	**	**
Clay	41.6 Ba	9.0 Bb	25.3
Average	62.7	15.4

Soil type: the means (n = 3 or 6) followed by different uppercase letters within the columns are significantly different by the Tukey test (p<0.05). Zn sources: the means (n = 3 or 6) followed by different lowercase letters across paired columns are significantly different by the Tukey test (p<0.05).

^aF test in the ANOVA of Soil vs. Source for each evaluated parameter. ns: not significant (p>0.05);

*p<0.05;

**p<0.01.

^bYoung fruits: 3–5 cm in diameter.