Épocas de produção do substrato e níveis de irrigação na produção da cultura da abobrinha em ambiente protegido

Abstract

The use of fertilization with organic fertilizers has become more frequent among rural producers, which makes determining the time of preparation of substrates to be used an important object of study. Furthermore, it is our knowledge that the scarcity of good quality water leads the food production sector to be concerned with the proper management of irrigation so that adequate production occurs and does not generate economic losses. Therefore, this study aims to evaluate the performance of zucchini, submitted to substrates prepared at different times by applying different irrigation depths. The experiment was conducted in greenhouse belonging to the agrometeorological station of Pici, in Fortaleza-CE. A completely randomized design was used, in a 5 x 2 factorial scheme, corresponding to five irrigation levels calculated by weighing microlysimetry (L1 = 50%, L2 = 75%, L3 = 100%, L4 = 125% and L5 = 150%) and two times of substrate preparation (T1 = 90 days before transplanting and T2 = one day before transplanting) called tanned and dry bovine manure, respectively, with 4 repetitions. Growth variables (plant height, stem diameter, number of leaves and leaf area), biomass variables (shoot, stem and root fresh matter) and physiological variables (photosynthesis, stomatal conductance, respiration, leaf temperature, and SPAD index). In most of the growth variables, the combination of the use of larger irrigation depths, such as L3 and L4, and the use of tanned bovine manure allowed higher results compared to the use of other irrigation depths studied and the use of dry bovine manure, as to the physiological variables it was found that the use of larger irrigation depths, such as L4 and L5 under the use of tanned cattle manure presented superior results compared to the use of lower irrigation depths and under the use of dry cattle manure.