Avaliação de esterco de aves poedeiras compostado e desidratado no desempenho agronômico de alface

Abstract

Laying poultry is undergoing major technological evolution, to accompany with other agricultural production chains and the growing human demand for chicken eggs, also providing a significant increase in manure production. This increase results in the need to transform it, to allow its commercialization, using dehydration. As it is a recent technology, without many studies on its use in Espírito Santo agriculture, there is a need for research. To enable the proper use of this product, two experiments were conducted with the objective of evaluating the dehydrated laying hen manure in the production of lettuce in an organic production system. The experiments were implemented and conducted in Santa Maria de Jetibá/ES. The first experiment was carried out in a greenhouse, in a 3 x 4 factorial design, with the first factor being three types of organic fertilizers (Dehydrated Laying Hen Manure - EGD, Composting Laying Hen Manure with Sawdust Powder - ECS and Composting Laying Hen Manure with Coffee Straw – ECP) and the second factor different pre-incubation times after fertilizer application (0, 3, 7 and 14 days), with five repetitions (each repetition a pot with a lettuce seedling). The second experiment was carried out under field conditions, in a randomized block experimental design in a factorial scheme [(2 x 4) +1], with the first factor corresponding to different types of organic fertilizers (EGD and ECS), the second factor corresponds to different fertilization levels (100, 200, 300 and 400 kg N ha-1

) and the 1 represents the control treatment (without fertilization), with four replications. With the analyzed results, it is concluded that the planting of lettuce must be carried out after an incubation period of at least three days after the application of laying hen manure compost to the soil; EGD, used in the present study, results in a lower agronomic performance of lettuce than that observed in the treatment with compost resulting from the mixture of chicken manure with sawdust; the dose of 300 kg N ha-1

of ECS results in the maximum accumulation of dry biomass per lettuce plant; ECS shows a quadratic response in lettuce yield, with a maximum dose of 300 kg N ha-1

, being 170 % higher than the value observed in dehydrated

manure.