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Manganese (Mn) is important to increase forage crop yields. However, there is little information regarding the adequate Mn-fertilizer rates for Brachiaria humidicula species. The objective of this research was to evaluate the effect of manganese on growth, nutrition and yield of Brachiaria humidicula. The study was carried out in a green house in a randomized block design with five rates of manganese (0, 15, 30, 60 and 120 mg dm -3 ) and four replicates. Were evaluated plant height, leaf area, relative chlorophyll index, dry matter production, manganese accumulation and content, besides absorption efficiencies and transport and use of manganese (Mn). Brachiaria humidicula showed high tolerance to this nutrient, because the application of only 120 mg dm -3 to the soil was phytotoxic, showing symptoms such as brown spots and leaf tip curling. Manganese applied at a dose of 120 mg dm -3 reduced aerial part biomass yield by 25% and promoted lower efficiency of use of this nutrient by the forage by 49%. However, even with the initial content of manganese in the soil considered sufficient to meet nutritional demands to achieving high yields, the application of 60 mg dm -3 of manganese to the soil is recommended.

Growth, nutrition and production of dry matter of Kikuyu Grass (Brachiaria humidicula) as a function of Mn-fertilizer