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

Table 1

Tomato shoot height, fresh weight, and dry weight 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	Ht. (cm)			Fresh wt. (g)			Dry wt. (g)
	Crop 1	Crop 2	Crop 3	Crop 1	Crop 2	Crop 3	Crop 1	Crop 2	Crop 3
Control	41.7	42.9	47.3	72.6	89.7	101.9	9.9	10.1	9.8
0 P-5% soil	43.4	43.2	47.3	78.1	88.7	98.2	10.2	10.2	9.7
0 P-10% soil	29.3	42.3	47.8	24.1	90.1	97.8	2.4	9.9	9.9
2.2 P-5% soil	47.4	38.7	17.9	95.3	55.2	11.3	12.7	6.2	1.4
2.2 P-10% soil	48.4	44.8	33.6	103.1	95.7	48.1	13.4	10.9	6.1
6.5 P-5% soil	48.7	43.7	42.1	98.0	89.7	73.5	12.9	10.4	8.8
6.5 P-10% soil	48.6	45.1	47.4	101.9	98.0	106.3	13.3	11.1	11.3
	2.20			5.52			0.86

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