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The effects of potassium levels (0, 30, 60, 90 and 120 kg of K2O ha -1 ) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Trachypogon plumosus were evaluated under field conditions. Potassium fertilization increased significantly GDM yields, K concentrations, number of tillers (NT), number of leaves plant -1 (NLP), medium blade length (MBL), leaf area index (LAI), leaf appearance (LAR) and elongation rates (LER). Maximum GDM yields, LAR, LER, NT, NLP, LAI and MBL were obtained with the application of 97.1; 116.0; 94.8; 105.1; 106.5; 97.4 and 88.2 kg of K2O ha -1 , respectively. The K critic level, related to 80% of GDM maximum production, was estimated at 17.91 g kg -1 . The K efficiency utilization was inversely proportional to the K rates applied, while the opposite occurring to the leaf senescence rate.

Rendimento de forragem e morfogênese de Trachypogon plumosus sob níveis de potássio