EXTRACTION OF SILICON IN SOILS FERTILIZED WITH PHOSPHATE AND SILICATE EXTRAÇÃO DE SILÍCIO EM SOLOS FERTILIZADOS COM FOSFATO E SILICATO

Abstract

<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">The objective of this study was to evaluate the levels of silicon (Si) extracted by using calcium chloride and acetic acid solutions, in Haplortox soil samples fertilized with phosphate and silicate. The experimental design was completely randomized, in a 5x2 factorial scheme, consisting of five doses of phosphorus (P) (0 mg dm^-3, 96 mg dm^-3, 192 mg dm^-3, 288 mg dm^-3, and 480 mg dm^-3), in the absence and presence of 300 mg dm^-3 of Si. The experimental units were submitted to two incubation periods, the first with silicate (half of the portions) and the second with limestone (remaining of the portions). After incubation, the soil samples received the P doses and were cultivated with corn plants. The Si level in the soil, measured by using extracting solutions, and the Si and P contents in the dry matter of the aerial part were evaluated. Significant effect was observed for Si, phosphate levels, and for the interaction Si x phosphate doses, in relation to the Si content extracted from the soil. The acetic acid solution extracted more Si than the calcium chloride solution, independently of the slag fertilization.</span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;"><span lang="en-US">KEY-WORDS:</span><span lang="en-US"><strong> </strong></span><span lang="pt-PT"><em>Zea mays </em></span><span lang="pt-PT">L.</span><span lang="en-US">; slag; phosphorus; extractors.</span></span></span></span></p><p style="text-align: justify !important;"><span style="color: #000000;"><span style="font-family: Verdana, sans-serif;"><span style="font-size: x-small;"><span>O objetivo deste estudo foi avaliar os teores de silício (Si) extraídos por soluções de cloreto de cálcio ou ácido acético, em amostras de Latossolo Vermelho distroférrico, fertilizadas com fosfato e silicato. O delineamento experimental foi inteiramente casualizado, em esquema fatorial 5x2, constituído pela combinação de cinco doses de fósforo (P) (0 mg dm^-3, 96 mg dm^-3, 192 mg dm^-3, 288 mg dm^-3 e 480 mg dm^-3), na ausência e presença de 300 mg dm^-3 de Si. As unidades experimentais foram submetidas a dois períodos de incubaç��o, o primeiro com escória (metade das parcelas) e o segundo com calcário dolomítico (restante das parcelas). Após a incubação, as amostras de solo receberam as doses de P e foram cultivadas com plantas de milho. Foram avaliados os teores de Si no solo, extraídos pelas soluções extratoras, e os conteúdos de Si e P, na matéria seca da parte aérea. Observou-se efeito significativo para o Si, doses de fosfato e para a interação Si x doses de fosfato, quanto aos teores de Si extraídos do solo. A solução de ácido acético extraiu mais Si do que a solução de cloreto de cálcio, independentemente da fertilização com escória.</span></span></span></span></p> <p class="western"><span style="color: #000000;"><span><span style="font-family: Verdana, sans-serif;"><span style="font-size: x-small;"><span lang="pt-BR"><span><span><span>PALAVRAS-CHAVE:</span></span></span></span></span></span></span></span><strong><span style="color: #000000;"><span><span style="font-family: Verdana, sans-serif;"><span style="font-size: x-small;"><span lang="pt-BR"><span><span><span> </span></span></span></span></span></span></span></span></strong><em><span style="color: #000000;"><span><span style="font-family: Verdana, sans-serif;"><span style="font-size: x-small;"><span lang="pt-PT"><span><span><span>Zea mays </span></span></span></span></span></span></span></span></em><span style="color: #000000;"><span><span style="font-family: Verdana, sans-serif;"><span style="font-size: x-small;"><span lang="pt-PT"><span><span><span>L.; </span></span></span></span></span></span></span></span><span style="color: #000000;"><span><span style="font-family: Verdana, sans-serif;"><span style="font-size: x-small;"><span lang="pt-BR"><span><span><span>Escória de siderurgia; fósforo; extratores.</span></span></span></span></span></span></span></span></p><p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR"><span style="font-family: 'Times New Roman', serif; font-size: x-small;"><br /></span></p>

Keywords

• Zea mays L.
• Escória de siderurgia
• fósforo
• extratores