Efficacy of a Phosphate-Charged Soil Material in Supplying Phosphate for Plant Growth in Soilless Root Media

Table 3

Nutrient concentrations in tomato shoots at the end of three successive seedling crops grown in root media amended with no soil material (control) and six soil material treatments combinations containing 5 or 10% soil material (v/v) charged with 0, 2.2, or 6.5 mg·g⁻¹ phosphate-P.

Treatment	Nutrient (%)
	N			P			K
	Crop 1	Crop 2	Crop 3	Crop 1	Crop 2	Crop 3	Crop 1	Crop 2	Crop 3
Control	2.29	3.30	4.77	0.31	0.52	0.90	2.38	3.23	4.09
0 P-5% soil	2.39	3.27	4.73	0.22	0.47	0.88	3.34	3.29	4.17
0 P-10% soil	3.90	4.88	4.45	0.26	0.38	0.68	4.80	4.86	4.12
2.2 P-5% soil	2.25	4.52	3.97	0.24	0.13	0.11	3.34	4.50	3.42
2.2 P-10% soil	2.19	4.99	3.62	0.38	0.19	0.12	3.50	4.95	3.78
6.5 P-5% soil	2.09	4.22	3.64	0.70	0.30	0.14	3.32	4.15	4.02
6.5 P-10% soil	1.89	5.00	4.16	0.82	0.63	0.34	3.44	4.94	4.37
	0.37			0.05			0.35

Crops 1, 2, and 3 were harvested at first cluster bloom (37, 27, and 36 days after transplanting 20-day-old seedlings, resp.).
LSD values are for comparing soil material treatments within a given crop or crops within a given soil material treatment.