The effect of silicic acid on rice in a P-deficient soil

Jianfeng Ma, Eiichi Takahashi

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53 Citations (Scopus)


A pot experiment was conducted to analyze the effect of silicon on the growth of rice grown in a P-deficient soil and on P availability in the soil. Silicic acid was used, rather than a silicate salt, to avoid the complication of changes in soil pH. Shoot dry weight on silicic acid treated soil (0.47 mg Si g-1 soil) increased significantly under both nonflooded and flooded conditions. Shoot Si concentration also increased although P concentration did not. Mn concentration decreased with silicic acid, resulting in a higher P/Mn ratio in shoots. An adsorption and desorption experiment showed that silicic acid did not displace P nor decrease the ability of the soil to adsorb P. In contrast, Si desorption increased with increasing P concentration in the solution, and Si adsorption was reduced when P was applied first. These results suggest that silicic acid does not increase P availability in soil. Increased dry weight may be attributed to a higher P/Mn ratio in the shoot, which may improve P utilization in the plant.

Original languageEnglish
Pages (from-to)121-125
Number of pages5
JournalPlant and Soil
Issue number1
Publication statusPublished - Aug 1 1990
Externally publishedYes


  • P adsorption
  • P desorption
  • P/Mn ratio
  • Yakuno soil
  • rice
  • silicic acid

ASJC Scopus subject areas

  • Soil Science
  • Plant Science


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