Exigência em nitrogênio de U. hibrida cv. Ipyporã

Abstract

Ipyporã grass, Urochloa interspecific hybrid, is a comparison between a genotype of Urochloa ruziziensis (syn. Brachiaria ruziziensis) and an access of Urochloa brizantha (syn. Brachiaria brizantha), which has nitrogen variability. For this reason, this work was verified from the nitrogen of the interspecific hybrid of Urochloa hybrida cv. Ipyporã The experiment was carried out in a greenhouse, in a randomized block design, with several treatments and several repetitions, in a factorial scheme. Treatments consisted of four nitrogen doses (0, 100, 200 and 300 mg dm-3) and three forage grasses, which were: U. hibrida cv. Ipyporã, U. humidicola cv. Llanero and P. maximum cv. Zuri. Each experimental plot consisted of a 3 dm³ pot with three plants and was correct for the last evaluations. The Ipyporã grass obtained greater response to nitrogen fertilization for the number of profiles and leaves than the other grasses. However, for total dry mass (MST) it was observed that the Ipyporã grass was less responsive to nitrogen fertilization, which is more responsible for the Llanero, which demonstrates that this is a strategy of grassland in nitrogen.