Efeito da adubação nitrogenada na atenuação do estresse salino no desenvolvimento inicial da cultura da moringa (Moringa oleífera L.).

Abstract

Moringa oleifera Lam is a tree plant of great social and economic importance. very well known not only in Brazil but worldwide due to its medicinais and nutritional characteristics. Based on scientific information, moringa is seen as a plant that is moderately tolerant to the effects provided by salinity. In this situation, the objective was to evaluate the effects of nitrogen fertilization and the salinity of the water used for irrigation in the culture of moringa oleifera Lam. The work was developed in a protected environment at the Federal University of Campina Grande - UFCG, located in the municipality of Pombal-PB. The treatments were distributed in randomized blocks being arranged in a factorial scheme of 4 x 4, corresponding to 4 levels of salinity S1= 0.3 dSm- 1, S2= 1.8 dSm-1, S3= 3.3 dSm-1 and e S4= 4.8 dSm-1, associated with four levels of ammonium sulfate (NH4)2SO4, in the concentrations of N1= 0, N2= 30g, N3= 60g and N4= 120g/kg, totaling 16 treatments and four repetitions, with 62 experimental units. The variables evaluated during 45 days were: plant height, stem diameter, root length, root dry mass, total dry mass. The data were examined using analysis of variance, applying the F test at a 5% probability level. It was observed that there was no interaction between the factors saline levels and levels of emotion for the evaluations at 45 days. There was no cognitively significant effect for salt levels, with only a cognitively significant effect for combustion levels for the following variables: plant diameter, stem diameter, root height, root dry mass and dry mass total.