With the objective of evaluating the cost/benefit relationship concerning to the adoption of reduced spacing in the culture of the corn in relation to the acquisition of a specific platform for the automated crop of grains, it was accomplished a study considering the different variables that interfere in the investment. For such, it was accomplished a differential cash flow. The calculation based in the cash flow the indicators of economical viability: Liquid Present Value (VPL), Payback (PRC) and Internal Tax of Return (TIR). It was made an Analysis of Sensibility on VPL for percentile variations in the increase of the productivity. Found VPL's were between US$ -16,575.00 and US$ 249,483.00. PRC varied from 1.74 to 17.13 years and TIR from -0.70 to 55.04%. The viability depends on the size of the area, technological level of the producer and productivity earnings with adoption of the reduced spacing.
production costs; automated crop; Zea mays
