Manejo do Nitrogênio Químico e Orgânico em dois Ciclos de Alface Irrigado com Água Residuária

Increasing the cost of mineral fertilizers and increasing environmental pollution make the use of organic waste in agriculture an economically attractive option due to the cycling of C and nutrients. The objective of this work was to evaluate the productivity and nutrition of lettuce in different management of chemical and organic nitrogen irrigated with wastewater from the Sewage Treatment Station in two cycles of lettuce. The experiment was carried out in a pot with 5 liters capacity, in a greenhouse, the experimental design was composed of 6 treatments and 5 randomized blocks as follows: T0 - without N; T1 - 0.54 grams of N (urea) per plant divided into three times (7, 14 and 28 days of transplantation); T2 - 0.27 grams of N (Organic Compound) and 0.27 grams of N (urea) divided into urea three times per plant (7, 14 and 28 days of transplantation); T3 - 0.54 grams of N (organic compound) per plant; T4 - 0.81 grams of N (organic compound) per plant; T5 - 1.08 grams of N (organic compound) per plant. Lettuces that were fertilized with organic compost obtained higher yields of fresh mass and accumulation of nutrients both in the first and second cycles.