Controle e aplicação de lâminas de irrigação por um sistema de aquisição de dados no cultivo da abóbora

Abstract

The pumpkin (Cucurbita moschata) has a wide participation in the feeding of the Northeastern population, and the Northeastern region of Brazil, especially its semi-arid portion, has historically been affected by the scarcity of water. The objective of this work was to determine the growth and production of the pumpkin crop submitted to different irrigation, and to evaluate two Data Acquisition Systems (DSS) developed to monitor soil moisture and control irrigation. The SAD's were field-tested and field-tested using precision indexes such as R2. The field experiment was carried out in a greenhouse with the Mini Paulista Isabela pumpkin culture, using five treatments of irrigation (treatments T1 = 120%, T2 = 100%, T3 = 80%, T4 = 60% and T5 = 40%, of ETc-FAO) in four replicates, being evaluated the variables of the plant Average Dry Weight of the aerial part (PMS), Foliar Area (AF) and average production of fruits per plant (PMF). AF and PMF were affected by the irrigation, presenting a significant difference of the treatments of T1 and T2 over the other treatments with water stress, whereas the SMP showed no significant difference at the 1% level between treatments. The T2 treatment presented PMF higher than the T5 treatment of approximately 72%. The SAD's and the ECHO EC-5 moisture sensor from Decagon@ have been shown to be efficient in irrigation automation, indirect determination of soil volumetric moisture by means of capacitance, as well as in the estimation of water consumption by plants