Crescimento, teores e acúmulo de nutrientes em plantas de milho fertirrigadas com água residuária do beneficiamento de frutos de café

• Autor(a) principal: Raposo Filho, Frederico Lopes
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/1229
• topic: Agronomia; Irrigação com águas residuais; Café; Macronutrientes; Milho - Cultivo; Plantas - Nutrição; 57

The coffee production always held a prominent place in the national economy, due to its importance in the economic and social community, looking for a distinct market with new technologies to improve the beverage quality. The activities of washing and pulping coffee, necessary to reduce drying costs and improve the quality of beverage, generates a large amount of solid and liquid waste which has a notable rates of organic and inorganic material. The residual water from processing coffee activity (RWC) has been generated every year in a large volume in Espírito Santo and the presence of nutrients indicates the viability to its reuse in fertigation of crops. The aim of this study was to evaluate the effect of different doses of residual water of coffee on growth, absorption, interaction of nutrients and the nutritional condition of corn (Zea mays L.). In this context, the experiment was conduct in a greenhouse applying the completely randomized design, where seven RWC doses were applied with three repetitions in experimental unities composed by vases with 2 dm³ of soil. The dosages had the following concentrations: 0.00, 15.17, 30.35, 45.52, 60.70, 75.87 and 91.05 liters of ARC per m² of soil. The seeding were performed using five seeds of BR 206 hybrid corn per vase and after five days were made the thinning, maintaining only three plants per vase. On the 30th day after germination, the following measurements were determined: stem diameter (SD), leaf area (LA), shoot dry matter (SDM), root dry matter (RDM), shoot/root ratio (SDM/RDM), root mass ratio (root dry weight / total dry matter) and leaf area ratio (leaf area / total dry matter). Aerial part of plants was used to established the levels of macronutrients (N, P, K, Ca, Mg and S). The data were subjected to analysis of variance and the doses of RWC were adjusted in regression models. For dependent variables was calculated the Pearson linear correlation coefficient. The application of ARC served as a fertilization input to corn crop, increasing most of the growth variables and N, K and S levels. However, it caused a decrease in shoot Ca, Mg and P levels, indicating that high dosages promote a disturb in nutrient relations.