Table 3. Maize Productivity and Phosphorus Use Efficiency on Treatment with Commercial Fused Superphosphates and Pure or Humic-Coated Hydroxyapatite Nanoparticles^a.

	maize productivity (Mg/ha)					phosphorus uptake (kg/ha)
treatment	grain	leaf	stem	root	sum	grain	leaf	stem	root	sum	ARE (%)
NK	12.0d	13.3c	11.4d	7.7c	44.4	3.0c	0.9b	1.1d	0.4b	5.4d
commercial P—NK	13.8bc	14.7bc	15.9bc	8.6b	53.0	3.6b	1.3b	3.7a	0.1b	8.7b	27.5c
HA—NK	13.1c	14.1c	13.5cd	7.2c	47.9	3.5b	1.1b	2.0c	0.7a	7.3c	13.3d
S2—NK	14.3b	15.9ab	16.4b	9.2b	55.8	4.7a	2.5a	2.2bc	0.9a	10.4a	36.2b
Y3—NK	16.2a	16.5a	20.5a	11.4a	64.6	4.5a	3.0a	2.8b	1.0a	11.3a	48.0a

^aData represent means ± SD (n = 3), and statistical analysis was based on LSD (p < 0.05). The same amount of NK fertilizers was used in all of the conditions. Phosphorus uptake and ARE were evaluated by phosphorus contents of soils, harvested crops, and fertilizers. Abbreviations: Commercial P, fused superphosphate; ARE, apparent recovery efficiency by difference (i.e., the amount of nutrient uptake (treatment – control)/the amount of nutrient treated).