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This work evaluated the production of forage mass and chemical-bromatolologic composition of the Mombaca ( Panicum maximum ) grass fertilized with organic waste of the siderurgic industry (po de balao) combinated with nitrogen and phosphorus, in conditions of greenhouse. For production of forage mass and chemical-bromatolologic, the complete randomized block design . The studied factors were: two organic wastes, poultry litter (4 g dm -3 ) and “po de balao” (10 g dm -3 ), four levels of N (0, 50, 100, 200 mg dm -3 ) and four of P 2 O 5 (0, 100, 200, 300 mg dm -3 ). The combination of organic waste with the nitrogen significant influence in the contents of macroelements (N , P and K ) and trace element ( Mn). The “po de balao” resulted in higher levels of Fe and OM when compared to the poultry- litter. The application of phosphorus influenced the variables Zn , CP , ADF , lignin and cellulose , with the highest content obtained for each variable was associated with 100 mg kg1 P for Zn and 300 mg kg1 P for the others. The organic residue , “po de balao” , it is contaminating the soil and forage due to the presence of heavy metals in its composition , this may be a limitation to its agricultural use as organic fertilizer. KEYWORDS: Organic fertilization. Siderurgic industry. Macronutrients. Nutritional value.

MASSA DE FORRAGEM E COMPOSIÇÃO QUÍMICO-BROMATOLÓGICA DE Panicum maximum cv. mombaça ADUBADAS COM RESÍDUO DE SIDERURGIA, NITROGÊNIO E FÓSFORO