Depletion of plant‐available silicon in soils: A possible cause of declining rice yields

Rice Yield and Available Nutrients Status of Loamy Sand Soil as Influenced by Different Levels of Silicon and Nitrogen

“…During the reproductive stage, silicon is preferentially transported into the flag leaves, and interruption of silicon supply at this stage is detrimental for spikelet fertility (Ma et al, 2006). The results are in line with the findings of Savant et al, (1997). Chen et al, (2011) stated that the silicon application increased grain yield by increase of spikelet number, filled spikelet percentage and 1000-seed weight.…”

Silício na nutrição mineral e acúmulo de alumínio em plantas de arroz de terras altas

“…O baixo teor de Si inicial do solo (2 mg kg -1 ) é consequência do avançado grau de intemperismo em que se encontram os solos de regiões tropicais (Korndörfer et al 1999) e dos elevados teores de sesquióxidos de Al e Fe, que são os principais responsáveis pela adsorção de Si em solução (Savant et al 1997). Com isso, pode-se inferir que o aumento no teor de Si do solo após a colheita, apesar de ter ocorrido (Figura 4), foi mínimo.…”

Genotypic response of silicon uptake ability in upland varieties of indica rice (Oryza sativa L.) and in silico analysis of silicon transporter gene (Lsi2) in var. Ghanteswari.

“…Hence, the silicon accumulation in rice has many fold importance to promote good yield and high productivity. Thus, the interactions of silicon with rice has become of particular interest to several researchers (Savant et al 1997 Rodrigues et al, 2004). Under controlled conditions, application of silicon to rice plants increased resistance to blast against Pyricularia grisea and Magnaporthe grisea (Kawashima 1927).…”

“…Supply of silicon in rhizosphere was not only been effective, but also "silicon supplementation in the form of external foliar treatments showed increased pathogen resistance of plant species (Richmond and Sussman 2003). Industrial by-products containing silicon were been used to benefit plants for increase rice disease resistance time to time (Jones and Handreck 1967, Savant et al 1997, Pereira et al 2004). Genotypic variation of silicon uptake and accumulation in the roots were reported by Parry and Kelso (1975) that revealed that silicon interacted with polyphenols in xylem cell walls and affected lignin deposition and biosynthesis.…”