Potássio no solo e na planta e produção de alfafa cultivada no sistema plantio direto sob doses de adubação potássica

• Ano de defesa: 2013
• Autor(a) principal: Biezus, Vanessa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Pato Branco; Programa de Pós-Graduação em Agronomia
• Palavras-chave em Português: Feno; Plantas forrageiras; Alfafa; Hay; Forage plants
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/753

This trial aimed to evaluate the potassium fertilization effects (0, 50, 100, 200, 300, 400 and 500 kg K2O ha-1) over forage production and nutritive value of alfalfa in the Southwestern Paraná. The experiment was carried out from September 2010 to December 2011 in Pato Branco – PR. Completely randomized blocks experimental design with four replications and seven treatments (potassium – K - fertilization levels) were used. The total amount of K was splitted out on three applications on cover (summer, fall and spring). Potassium chlorate (KCl – 60%) was used. The evaluated variable were: total dry matter production (one year round), dry matter production per harvest, harvests frequencies, sward canopy high in the harvests events, aboveground K concentration, forage nutritive value (NDA, CP, TDN), K plant uptake, and K concentration at different soil depths. The data were analyzed by variance analysis (5% significance). Tukey test was used for qualitative variables and polynomial regression analysis for quantitative variables. None variable was affected by potassium fertilization levels, except K concentration in the soil, this one was also affected by date and depth sampling. Dry matter production, aboveground K concentration, crude protein content, and sward canopy height at the harvests, were only affected by date sampling.