Efeitos da aplicação de água residuária na cultura da aveia preta.

Abstract

The expanded acreage of cassava crops to supply the needs from industrial plants has been facing the production and the appropriated destination of the effluents previously stored in ponds to achieve proper chemical modification. This experiment had the objective to investigate the performance of oat crops fertilized with different effluents from the cassava as an organic source of nutrients to be compared to the control (T0) or to the urea fertilization as the N source (T7). The chemical analysis for Ca, Mg, P, and K in five different effluents (T1 to T6) indicates an average of 39.67, 44.47, 28.21, and 332.85 mg.dm-3 for the pond number 1; 34.37, 31.78, 11.47 and 279.83 mg.dm-3 for the pond number 2; 57.02, 53.36, 42.67, and 295.58 mg.dm-3 for the pond number 3; 4: 41,55; 40.76; 36.01 and 284.81 mg.dm-3 for the pond number 4; 31.35, 33.59, 8.82 and 310.28 mg.dm- 3 for the pond number 5, respectively. The crop yields in kg.ha-1 of the dry biomass above-ground were T7: 4863.0 A; T3: 4141.0 AB; T4: 4134. AB; T6: 4053.0 AB; T5: 3810.0 AB; T2: 3579.0 B; T0: 3350.0 B; T1: 3300.0 B. Only the chemical fertilization (T7), due to the dosage of nitrogen, provided a significant increase, (P<0.05) by the Tukey test, in the crop yield in comparison to the control.