Table 2.

Summary of effects of silicon (Si) on phosphorus (P) content and plant growth: (−) inhibition, (+) stimulation, and (0) no change.

Taxon	Si Form	P Level	Experimental Conditions	pH of Experimental Medium	Effects on Shoot P Content	Effects on Plant Growth?	References
Glycine max; Fragaria ananassa; Solanum lycopersicum	Silicic acid	0.58 mM; 0.23 mM; 2.3 mM;	Hydroponic	5.5	Decreased	+	[10,11,12]
Oryza sativa	Silicic acid	1.4–700 µM	Hydroponic	5.5	No effects under low P (≤14 ppm), but decreased at higher P levels	+	[13,14]
Cucumis sativus	Silicic acid	0.05–1.2 mM	Hydroponic	5.5	No effects under low P (0.05 mM), but decreased at higher P levels	+	[15]
Oryza sativa	Silicic acid	90–210 µM	Hydroponic	5.5	Decreased	+	[16]
Solanum lycopersicum	Potassium silicate	0.44–0.66 mM	Hydroponic	5.8–6.0	Increased	+	[17]
Hordeum vulgare	Sodium silicate	No P addition	Field	Unknown	Decreased slightly	+	[18]
Oryza sativa	Silicic acid	No P addition	Soil culture	4.5	No effects	+	[19]
Oryza sativa	Sodium silicate	No P addition	Soil culture	4.5	No effects	+	[20]
Zea mays	Calcium silicate	0–0.3 g per 1.5 kg soil	Soil culture	5.3	Increased	+	[21]
Oryza sativa	Diatomaceous earth	25–50 kg P ha−1	Field	7.4	Increased	+	[22]
Oryza sativa	Wollastonite, slag and foliar Si solution	4.5 ton ha−1 and 0–80 mg L−1	Soil culture	6.1	No effects	0 or −	[23]
Triticum aestivum	Sodium silicate	No P addition	Soil culture	4.0	Increased	+	[24]
Solanum tuberosum	Powder FertiSilica	10–200 ppm	Soil culture	4.5	No effects	0	[25]