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PHOSPHORUS SOURCES AND PLACEMENT ON MAIZE YIELD AND MINERAL NUTRITION

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Author(s): IVÂNIA BARBOSA ARAÚJO | ANTONIO EDUARDO FURTINI NETO | ÁLVARO VILELA DE RESENDE | VERA MARIA DE CARVALHO ALVES | BRENO RODRIGUES MENDES

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 3;
Issue: 2;
Start page: 250;
Date: 2004;
Original page

Keywords: Phosphate fertilization | phosphates: leaf analysis | phosphorus-zinc interaction

ABSTRACT
With the aim of evaluating the effect of phosphorus sources in different placement options on maize yield and mineral nutrition, a trial was carried out in field conditions on a clayey Typical Red Argisol under cerrado vegetation. The treatments were: triple superphosphate (TS), magnesium termophosphate (MT), Arad reactive rock phosphate (RP), and Araxá rock phosphate (AP), which were spread on the whole area or banded in the seeding furrow. All fertilizers were applied at the rate of 180 kg P2O5 ha-1, based on the total P2O5 of each fertilizer. A check, without P, was used as an additional treatment. It was measured the nutrient concentrations in the maize leaves at the flowering and in different plant parts at harvest. The shoot dry matter, grain yield, and accumulation of nutrients were also determined. Greater yields were obtained with the most soluble sources (TS and MT) when spread and with the reactive phosphate (RP) banded in the planting furrow. Placement of TS in the planting furrow decreased yield because of metabolic disorders due to the P and Zn interaction. The leaf analysis at the flowering showed to be appropriate for maize P/Zn balance evaluation.
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