Water retention curve of coconut fiber substrate for cultivation in pots in greenhouse

Keywords: Irrigation management, Water content, Tensiometer

Abstract

A substrate with adequate porosity and water retention capacity makes it possible to maximize the yield and quality of crops produced in containers in greenhouses. A great alternative is coconut fiber, which needs careful irrigation management, which can be based on monitoring the water content in the root zone using tensiometers. In this sense, this work aimed to determine the water retention curve of coconut fiber in pots through the technique of water removal by evaporation and measurement of water tension with tensiometers, after which the pots were weighed and the corresponding water content was calculated by difference between the measured mass and the dry substrate mass. A data acquisition system was used to record the readings from the tensiometer pressure transducers. Tension, water amount and substrate density data were used to fit the water retention curves according to regression models and the Van Genuchten model. The use of tensiometers in the coconut fiber substrate made it possible to determine the water retention curve quickly and practically from almost continuous tension readings between 12 and 268 hPa, corresponding to water contents between 0.37 and 0.05 cm3 cm-3. Thus, it was possible to adjust the retention curve in a simple way, using regression models with high coefficients of determination. Although the hydric parameters of the substrate are lower than those referred to in the literature, they are useful to adequately manage irrigation in containers.

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Author Biographies

Erlen Kaline Ávila do Nascimento, Universidade do Estado do Rio Grande do Norte, Mossoró

Mestranda em ciências naturais subárea diagnóstico ambiental, pelo Program de Pós-graduação em Ciências Naturais da Universidade Estadual do Rio Grande do Norte.

Lunara Gleika da Silva Rego, Universidade Federal Rural do Semi-Árido, Mossoró

Departamento de Ciências Agronômicas e Florestais da Universidade Ferderal Rural do Semi-Árido.

Neyton de Oliveira Miranda, Universidade Federal Rural do Semi-Árido, Mossoró

Professor do Departamento de Ciências Agronômicas e Florestais da Universidade Federal Rural do Semi-Árido.

Vladimir Batista Figueirêdo, Universidade Federal Rural do Semi-Árido, Mossoró

Professor do Departamento de Ciências Agronômicas e Florestais da Universidade Federal Rural do Semi-Árido.

Nathalia Gomes Silva, Universidade Federal Rural do Semi-Árido, Mossoró

Departamento de Ciências Agronômicas e Florestais da Universidade Federal Rural do Semi-Árido.

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Published
2021-07-01
How to Cite
NASCIMENTO, E. K. ÁVILA DO; REGO, L. G. DA S.; MIRANDA, N. DE O.; FIGUEIRÊDO, V. B.; SILVA, N. G. Water retention curve of coconut fiber substrate for cultivation in pots in greenhouse. Revista Verde de Agroecologia e Desenvolvimento Sustentável, v. 16, n. 3, p. 259 - 265, 1 Jul. 2021.
Section
AGRICULTURAL SCIENCES