Validação de parâmetros operacionais para o manejo de mesas de subirrigação

Abstract

Modeling operational parameters for water management of ebb-and-flow benchesSubirrigation requires appropriate water and nutrient management based on the equipment specifications and crop cultivated in order to obtain high irrigation efficiency. Our objectives were to characterize the operation of an automated ebb-and-flow bench in theoretical and experimental conditions, determining the irrigation time inside the equipment at different water heights and water flows. The first step was to simulate the ebb-and-flow subirrigation bench performance, by estimating the application and drainage time for different water depths (1, 3 and 5 cm) and flow rates (10, 20 and 30 L/min) based on empirical equations. The second phase evaluated the ebb-andflow subirrigation bench performance experimentally, validating the proposed simulation methodology. The third step consisted of applying equations to simulate water management parameters for the ebb-and-flow bench. The theoretical values of irrigation time ranged from 9.1 to 68.2 minutes and the experimental values ranged from 9.5 to 78.4 minutes. The combination of water flow and height controlled the contact time and height between the water and substrate and allowed the water management establishment for different cultivation conditions.

Advances in citrus propagation in Brazil

“…Production may also target the replacement of rootstocks in existing orchards by inarching . This method has been successfully used for the recovery or prevention of the citrus sudden death (CSD) disease (GIRARDI et al, 2007b;RIBEIRO et al, 2014).…”

“…Studies on using ebb-and-flow subirrigation for citrus production were started in Brazil in 2005 at the University of Campinas's School of Agricultural Engineering (Campinas, SP, Brazil), and have been providing critical information regarding the use of this system at a large scale. These studies include the determination of the relationship between the water level height and the water retention time in the substrate in subirrigation systems (FERRAREZI et al, 2017a), and the validation of operational parameters for the use of subirrigation benches (RIBEIRO et al, 2017). Studies on the effect of subirrigation on the production of citrus rootstock liners were described by Ferrarezi & Testezlaf (2017a.…”