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Frequency of recirculation of nutrient solution in hydroponic cultivation of coriander with brackish water/Frequencias de recirculacao de solucao nutritiva no cultivo hidroponico de coentro com agua salobra

The present study used a hydroponic system with leveled channels, in order to evaluate coriander cultivation under different intervals of nutrient solution recirculation and the use of freshwater and brackish water. The experiment was carried out in a randomized block design with five replicates, in...

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Bibliographic Details
Published in:Revista brasileira de engenharia agrĂ­cola e ambiental 2016-05, Vol.20 (5), p.447
Main Authors: da Silva, Mairton G, Soares, Tales M, Gheyi, Hans R, Oliveira, Itamar de S, Filho, Jose A. da Silva, do Carmo, Francicleiton F
Format: Article
Language:English
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Summary:The present study used a hydroponic system with leveled channels, in order to evaluate coriander cultivation under different intervals of nutrient solution recirculation and the use of freshwater and brackish water. The experiment was carried out in a randomized block design with five replicates, in a 2 x 4 factorial scheme, from February to March 2014. Two levels of electrical conductivity (EC) of water (0.32 and 4.91 dS [m.sup.-1]) and four frequencies of nutrient solution recirculation (at intervals of 0.25, 2, 4 and 8 h) were evaluated. This experimental design was adopted in the evaluations performed at 10, 15 and 25 days after transplantation (DAT). Additionally, at 21 DAT subplots were established for the evaluation of plant position (initial, intermediate and final) along the hydroponic channels. It is viable to use nutrient solution recirculation every 8 h, without production losses. The use of brackish water (EC = 4.91 dS [m.sup.-1]) may be an alternative for the hydroponic cultivation of coriander, despite the reduction in production, but without any damage on the visual aspect of the product. Plants grown at the initial and intermediate positions along the hydroponic channels showed higher production. Key words: Coriandrum sativum L. DFT hydroponics water salinity Neste trabalho foi utilizado um sistema hidroponico com os canais de cultivo em nivel com o objetivo de avaliar a cultura do coentro submetida a diferentes intervalos para recirculacao da solucao nutritiva em interacao com o uso de agua doce e salobra. O experimento foi conduzido em blocos casualizados com cinco repeticoes, em esquema fatorial 2 x 4, entre fevereiro e marco de 2014. Avaliaram-se dois niveis de condutividade eletrica (CE) da agua: 0,32 e 4,91 dS [m.sup.-1], alem de quatro frequencias de recirculacao da solucao nutritiva (intervalos de 0,25; 2; 4 e 8 h). Este delineamento experimental foi aplicado nas avaliacoes realizadas aos 10, 15 e 25 dias apos o transplantio (DAT). Adicionalmente, aos 21 DAT foram estabelecidas subparcelas visando avaliar o efeito da posicao das plantas (inicial, intermediaria e final) nos perfis hidroponicos. E viavel adotar-se recirculacao da solucao nutritiva a cada 8 h sem perdas de producao. O uso da agua salobra (CE = 4,91 dS [m.sup.-1]) pode ser uma alternativa para o cultivo do coentro hidroponico, mesmo com reducoes na producao, porem sem efeitos depreciativos a qualidade visual do produto. As plantas cultivadas nas posicoes inicial e inte
ISSN:1415-4366
DOI:10.1590/1807-1929/agriambi.v20n5p447-454