Acumulação de N P K no capim-tifton 85 em diferentes idades

Abstract

For a better understanding of the factors related to mineral nutrition and fertilization of Tifton 85, you must know the patterns of accumulation of shoot biomass and nutrients. This study was conducted in order to monitor the nitrogen absorption speed (N), phosphorus (P) and potassium (K) and the biomass accumulation in the shoot. The study was conducted at the Center for Teaching and Research in Urban Agriculture (NEPAU), Campus do Pici of Ceara Federal University. We used a completely randomized design with ten times of plant collections and five replications. The soil received liming and fertilization with macro and micronutrients, organic compound was then added in the ratio of 4: 1, then 10 dm3 of soil was packed in pots. Eight were planted seedlings of Tifton 85 in each pot. The plants were collected and separated into leaf and stem after dried in an oven with forced air circulation at 65 ° C for 72 hours, was determined for each fraction MS. Each fraction was ground for determination of N, P and K. The shoot biomass accumulation showed exponential behavior. The accumulation of nutrients in the aerial part of the Tifton 85 showed a linear response, with the following descending order: K> N> P. The accumulation of the stem K is greater than N, while the leaves was reverse.