Quantificação de macronutrientes na cultura do milho após aplicação de fertilizantes fosfatados

• Autor(a) principal: Alves, Milla Stefane dos Santos
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Biblioteca Digital de Monografias da UFMT
• Texto Completo: http://bdm.ufmt.br/handle/1/2402
• topic: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA; fósforo; colunas de lixiviação; Zea mays; Phosphorus; Leaching columns; Zea mays

Phosphorus (P) is considered an essential element for plants and is found in low quantities in tropical soils, where phosphate fertilization is necessary to ensure maximum crop productivity, and potentiate the absorption of some nutrients, such as nitrogen ( N). Leaching columns were used to quantify the leached macronutrients and the initial development of maize, based on the sources of phosphate fertilizers applied to the surface and incorporated. The experiment was conducted in a greenhouse, using PVC cylinders and samples of Yellow Red Latosol. The experimental design was a completely randomized design, with four sources of P and two modes of application, in a 4x2 factorial scheme, with additional control, composed of four replicates with nine treatments, all with 80 kg ha-1 of P2O5. [0 kg ha-1 in control; 470 kg ha-1 of SSP haul; 154 kg ha-1 MAP transport; 154 + 40 kg ha-1 MAP + sulphurgrana; 154 + 2000 kg ha-1 MAP + Cast of plaster; Furrow of 470 kg ha-1 SSP; Groove MAP 154 kg ha-1; 154 + 40 kg ha -1 MAP + sulfur sulcus; 154 + 2000 kg ha-1 MAP + gypsum], totaling 36 plots. After 30 days, the stomatal conductance, the PSII electron flux for the PSI and the chlorophyll content were quantified. The plant samples were collected, measured in height, wet and dry weight and number of leaves, then placed in paper bags and baked at 65ºC for 72 hours. The data were analyzed using the statistical program R (Core Development Core Team). The analysis of variance (ANOVA) and the F test were performed. The incorporated application of P influenced the vertical movement more than the surface movement, Ca was potentially leached with the incorporated application, Mg and S had greater losses in the control treatment, the photosynthetic activity and the electron flow were larger when P sources were applied and MAP + Gypsum was the treatment that favored plant height at 30 DAE.