Resumo

CERDAS-RAMIREZ, Roberto; VIDAL-VEGA, Edgar  e  VARGAS-ROJAS, Jorge Claudio. Productivity of Cuba OM-22 grass (Pennisetum purpureum x Pennisetum glaucum) with different levels of nitrogen fertilizer. InterSedes [online]. 2021, vol.22, n.45, pp.136-161. ISSN 2215-2458.  http://dx.doi.org/10.15517/isucr.v22i45.47069.

A study was conducted to evaluate the productive behavior of the Cuba OM-22 grass, in Santa Cruz, Guanacaste, county located at 54 masl, with a 1834 mm annual rainfall. Production of green and dry biomass, content and production of crude protein per hectare, and macro-nutrient and micro- nutrient content of Cuba OM-22 were evaluated, subjected to four doses of nitrogen, with cuts at 56 days; 50, 100, 150 y 200 kg N ha-1. The yield of dry biomass varied with the dosage of N applied, which produced 6.7 t, 8.5 t, 10.9 t and 11.3 t MS ha-1 cut-1, biomass growth rate presented values of 120 kg, 152 kg, 195 kg and 201 kg MS ha-1 day-1, production of crude protein per hectare was 459 kg, 751 kg, 1180 kg and 1459 kg PC ha-1 cut-1, with the application of 50 kg, 100 kg, 150 kg and 200 kg N ha-1 cut-1 respectively. All nutrients are presented in suitable animal health and production quantities, with the exception of potassium (K), which showed values greater than 3.0% of the dry matter, with the doses of 150 and 200 kg N ha-1 cut-1. It is recommended to apply 150 kg N ha-1 to Cuba OM-22 grass per cut of 56 days.

Palavras-chave : Cuba OM-22; P.purpurem x P.glaucum; nitrogen fertilization; protein per hectare; macro and micronutrients content.

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