Avaliação de fontes e de extratores de silício no solo

Abstract

Resumo -O objetivo deste trabalho foi avaliar extratores e fontes de silício (Si) na cultura do arroz em Neossolo Quartzarênico em casa de vegetação. O delineamento experimental foi feito em esquema fatorial (26x7) inteiramente casualizado com 25 fontes de silício, aplicadas à dose de 250 kg ha Evaluation of sources and extractors of silicon in the soilAbstract -The objective of this work was to evaluate silicon extractors and sources in the culture of the rice in a Quartzipsamment soil in a greenhouse. The experiment was completely randomized as a factorial design (26x7), comprising 25 silicon sources with 250 kg ha -1 of Si applied, and the control, as well as 7 silicon extractors in the soil. Additional treatments with 125, 375 and 500 kg ha -1 of Si were applied with wollastonite. Ninety days after sowing, the yielded dry matter of aerial parts and the soil and plant tissue Si content were determined. The source that provided higher Si absorption to the plants of rice was gel silicon, and the source that provided lower absorption was the MB-4. The extractors presented increased linear content of Si in the soil with the increment of doses of wollastonite. Among treatments, the high Si extraction ocurred with the acetic acid, and the calcium chloride went the extractor with better correlation. Ammonium carbonate and ammonium acetate presented near correlations to calcium chloride and had a larger distribution of the points, which better discriminated variations among the Si sources.

Soil-applied silicon decreases severity of wheat spot blotch on silicon-deficient soils

“…The effect of calcium carbonate (CaCO 3 ) and wollastonite (CaSiO 3 ) on the soil pH in the two soils was similar (Table 1), as also reported by Pereira et al (2007). Besides supplying Si to the plants, wollastonite is an efficient liming material for the soil and is considered a standard Si source.…”

Acidity neutralization and silicon availability using calcium silicate in soil cultivated with wheat (Triticum aestivum L.)

“…In soil samples where CaSiO 3 was applied as a corrective material, Si content increased when compared to the other treatments, because this element was solubilized and released, corroborating the findings of Ramos et al (2006), Pereira et al (2007), and Korndörfer et al (2010). No difference was observed between CaSiO 3 doses used to increase Si content in soil and the latter increased to 18.17 and 28.21 mg dm -3 , respectively, for the doses of 2.15 and 4.30 g kg -1 .…”

Eficiência de escórias de siderurgia na cultura do feijoeiro em sistema de semeadura direta

“…Embora o extrator cloreto de cálcio 0,01mol L -1 mostre maiores correlações entre o Si extraído no solo e a quantidade de silício absorvida pela planta (PEREIRA et al,2007), os resultados ainda não são satisfatórios. Em estudos com extratores de silício no solo, o CaCl 2 tem apresentado estreita faixa de extração, (NARAYANASWAMY & PRAKASH, 2010;RODRIGUES et al,2003) e essa amplitude infl uencia na exatidão da análise, pois pode promover erros de análises (PEREIRA et al,2007).…”