Análise econ？mica dos sistemas de cultivo com Schizolobium parahyba var. amazonicum (Huber ex Ducke) Barneby (Paricá) E Ananas comosus var. erectifolius (L. B. Smith) Coppus & Leal (Curauá) no município de Aurora do Pará (pa), Brasil

the main purpose of this work was to analyze the economic viability of crop systems with schizolobium parahyba var. amazonicum (huber ex ducke) barneby and ananas comosus var. erectifolius (l. b. smith) coppus & leal, considering three distinct systems: i) parica monoculture; ii) curauá monoculture; and iii) paricá + curauá system. the experiment was carried out in the tramontina's belém experimental field in aurora do pará, pa. from the registers of the accounts of expenditure and prescription of the unitary budget, elaborated for system each, a box flow was elaborated. the economic viability was determined through calculations of: net present value (npv), benefit/cost ratio (b/c.r), break-even point (bep) and internal rate of return (irr) in three distinct activities. for tax calculations of a 12% of discounting was chosen. the costs and the prescriptions had been esteem in r$/ha. results showed that curauá monoculture had a greater vpl (r$ 19,853.44), followed by the plantation of parica and curaua (r$ 9,507.795). the paricá and curauá system showed a high benefit/cost relation (1.29), while parica monoculture the b/c.r was less than 1. among the analyzed activities, the curauá monoculture showed a greater tir (44%) followed by the paricá and curauá system (33%). the association between paricá and curauá showed to be economically recommendable, as for agriculturists, whom they desire to implant a forest stand, as for companies interested in the reduction of the forest costs.