Critical ranges of levels for primary leaf macronutrient coffee fertirrigated during the first year after planting

• Autor(a) principal: Pinto, Clayton Grillo
• Data de Publicação: 2014
• Outros Autores: Guimarães, Rubens José, Villela, Gabriel Mendes, Scalco, Myriane Stella
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Coffee Science (Online)
• Texto Completo: https://coffeescience.ufla.br/index.php/Coffeescience/article/view/523
• topic: Foliar analysis; mineral nutrition; irrigated coffee culture; Análise foliar; nutrição mineral; cafeicultura irrigada

The study had as objective to establish critical ranges of foliar and find the best level of fertilization with nitrogen, phosphorus and potassium for coffee fertirrigated in the first year after planting. The experiment was carried out in field conditions in the Coffee Culture Sector of the Agriculture Department, Federal University of Lavras, MG, from March2010 to July 2012. The experimental design was randomized blocks with six treatments, four replications and split plot on time. The fertilization levels were 10%, 40%, 70%, 100%, 130% and 160% in relation to standard fertilizer of 100%. Chemical analyzes of leaves were conducted in six seasons for every two months, from December 28, 2010. In July 2012 was obtained the coffee productivity (L plant-1) at the first harvest. Significant effects of fertilizer levels on productivity. For fertirrigated crops in the first year of fertilization after planting, the best level of fertilization with nitrogen, phosphorus and potassium is 118.33% in relation to standard fertilizer used for non-irrigated crops in formation. The critical ranges found and critical levels suggested of foliar levels from the nutrients for irrigated coffee crops in the first year of fertilization were among 27.3 and 34.8 g kg-1 nitrogen; 1.5 and 3.3 g kg-1 phosphorus; and 21.8 and 28.4 g kg-1 potassium.