Efeito do nitrogênio e do lodo de esgoto nos fatores produtivos do feijoeiro

the final disposal of sewage sludge has become one of the most important urban environmental problems. the volume of this waste is growing daily in both developed and developing countries, reflecting the expansion of collection networks and increased levels of treatment. the objective of this study was to investigate the effect of sewage sludge and n chemical fertilizers on bean yield components. composted sewage sludge was applied in december 2007 on common bean grown in no-tillage system. the experiment was arranged in a randomized block design, consisting of 6 treatments and 4 replicates defined as follows: t0 - no nitrogen fertilization; t1 - mineral nitrogen fertilizer according to the recommendations for the crop; t2 - 50% nitrogen fertilizer from sewage sludge and 50% in the mineral form; t3 100% nitrogen derived from sewage sludge; t4 - 150% nitrogen derived from sewage sludge; t5 - 200% nitrogen derived from sewage sludge. increasing the dose of sewage sludge promoted an increase in the number of pods, dry matter yield, grain yield and 1000 grain mass.