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- W2894053580 abstract "RESUMO: Tres rochas foram avaliadas quanto a capacidade de fornecer potassio para o crescimento inicial do milho, num Latossolo Vermelho-Amarelo argiloso, em condicoes de casa de vegetacao. As rochas biotita xisto, brecha alcalina e ultramafica alcalina foram moidas (< 0,3 mm) e comparadas a fonte cloreto de potassio, nas doses de 50, 100 e 150 mg kg-1 de K. Uma testemunha sem K e a aplicacao isolada das rochas constituiram tratamentos adicionais. Os resultados indicam que ha pronta liberacao de parte do potassio das rochas, suficiente para atender a demanda das plantas de milho. O extrator Mehlich 1 mostra boa eficiencia na predicao da disponibilidade de potassio no solo, apos a aplicacao das rochas. A ultramafica se destaca por apresentar maior eficiencia relativa no suprimento de potassio, alem de efeitos beneficos adicionais ao desenvolvimento das plantas, como poder corretivo da acidez e liberacao de outros nutrientes, atuando como um condicionador de solo. ABSTRACT: Three rocks were evaluated according their capacity to furnish potassium for the initial growth of corn in a clayey Yellow-Red Latosol (Oxisol) under greenhouse conditions. The rocks biotite, brecha, and ultramafic were grounded (< 0,3 mm) and compared with the potassium chlorid in doses of 50, 100, and 150 mg kg-1 of K. Results showed that part of the rock potassium was readily released, attending the plant demand. The Mehlich 1 extractant was efficient to predict the soil potassium availability after rock application. The ultramafic rock presented greater relative efficiency in terms of potassium supply, besides some additional benefic effects to plant development, like soil acidity amelioration and release of other nutrients, acting as a soil conditioner." @default.
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- W2894053580 date "2007-07-14" @default.
- W2894053580 modified "2023-09-23" @default.
- W2894053580 title "Rochas moídas como fontes de potássio para o milho em solo de cerrado." @default.
- W2894053580 hasPublicationYear "2007" @default.
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