Table 2. Nitrogen uptake efficiency (NUE) in whole tree and nitrogen recovered in different soil fractions of Nules clementine trees harvested in December (at dormancy) receiving vegetal (VO) or animal-derived (AO) liquid organic fertilizer and their respective mineral controls (VMC and AMC, vegetal and animal mineral controls, respectively) ^§.

	VMC	AMC	VO	AO	M vs. O†	V vs. A‡
NUE	33.87±1.5a††	34.47±0.50a	29.90±0.90b	29.59±0.21b	**	ns
Soil NH4-N	0.33±0.04bc	0.26±0.04c	0.58±0.07a	0.49±0.08ab	**	ns
Soil NO3-N	12.32±1.19a	8.37±1.16b	1.53±0.14c	1.17±0.17c	***	**
Soil Organic-N	14.08±0.69b	13.87±0.80b	32.05±2.41a	30.90±1.39a	***	ns

^§Each value is an average of five soil samples plants ± standard error.

^†ANOVA. Partition of variance amongst the treatment and block factors according to Fisher’s least significance difference (LSD) test at P ≤ 0.05 (*), P ≤ 0.01 (**), P ≤ 0.001 (***) and not significant P>0.05 (ns). Factor 1: the source of the nutrients, Mineral (M) versus Organic (O) fertilizers

^‡Factor 2: the organic fertilizer origin with two levels, Vegetal (V) or Animal (A) based organic fertilizer.

^††Within each row, different letters denote differences among means according to Fisher’s least significance difference (LSD) test at P ≤ 0.05 and not significant P>0.05 (ns).