A comparative economical evaluation of conventional and no-tillage bean crop systems was done. A field experiment was settled under irrigation, at Dois Irmãos Farm, Pereira Barreto, São Paulo State, sowed in the winter of 2001. The experimental design was a randomized block with four replications for each tillage system. N fertilization was applied 27 days after emergency at the rates of 20, 40, 60, 80, 100 kg.ha-1 of N. Urea and ammonium nitrate were used as nitrogen source. The cv. Carioca was used at a seed density of 15 seeds per meter in rows 0,50 cm apart. Herbicide was applied in the no-tillage plots before sowing. Conventional tillage plots were prepared with plowing and harrowing twice. The results show that bean crop responds differently the nitrogen source. The economical evaluation pointed out the higher profitable index of 40,6% for urea source at N doses of 60 kg.ha-1, under conventional tillage system. The best result for no tillage sowed 25,6% profitable index and was obtained with 40 kg.ha-1 of N.
Phaseolus vulgaris; economical evaluation; N fertilization
