Características morfogênicas do capim-Tanzânia consorciado com Estilosantes Campo Grande ou adubado com nitrogênio sob pastejo

Abstract

This study aimed to study morphogenic and structural characteristics of Tanzania grass ( Panicum maximum cv. Tanzania) intercropped with Estilosantes Campo Grande ( Stylosanthes capitata and Stylosanthes macrocephala ) or fertilized with nitrogen. The pasture was managed under continuous stocking and variable stocking rate. Were used a randomized complete blocks with split plots and three replications. The treatments were: Tanzania grass + Stylosanthes ; Tanzania grass + 75 Kg N.ha. year-1; Tanzania grass + 150Kg N.ha.year-1; Tanzania grass + 225 Kg N.ha.year-1. Were used urea and ammonium nitrate as nitrogen source. The morphogenetic evaluations were conducted in the spring and summer. Were evaluated 15 tillers per paddock, twice a week for four weeks per season in study. The morphogenic characteristics were not affected by nitrogen fertilization or consortium, except the leaf elongation rate (LER). The highest values for this variable were observed in the spring in the fertilized pastures. Therefore, it is concluded that nitrogen fertilization influences the leaf elongation rate (LER) of Tanzania grass, and this one when is intercropped with Stylosanthes Campo Grande show morphogenic characteristics similar when fertilized with nitrogen, except for rate leaf elongation.