Resposta do feijoeiro a doses de fósforo em solo arenoso

Phosphorus availabity is influenced by several attributes that affect the response of the crops to the P application. The field experiment was conducted, on Mocambinho Experimental Farm (EPAMIG), "Projeto Jaiba" region, northern Minas Gerais, Brazil, on a Quartzipsament with the objetives of evaluating the response of common bean to P2O5 doses and critical levels for P in soil and in leaves. Four P2O5 doses were applied (0, 35, 70 and 140kg ha-1). The treatments were an followed by a randomized block design, with five replications. The cultivar "Carioca" with 240,000 populations of plants per ha was evaluated. The following observations were grains yield, soil P content (Mehlich 1) and leaf content in year 2,000. The grains yield of common bean increased with P2O5 doses, attaining yield to optimum profit yield (OPY) of 3,821kg ha-1 with application of 98kg ha-1 of P2O5. Phosphorus critical level in soil associated to OPY was 15.7mg dm-3 and to phosphorus leaves was 3.9g kg-1.