Consumo de energia elétrica e produção de alface hidropônica com três intervalos entre irrigações

Luz, Gean Lopes da; Medeiros, Sandro Luís Petter; Manfron, Paulo Augusto; Borcioni, Elis; Müller, Liziany; Amaral, Alan Dischkaln do; Morais, Katiule Pereira

doi:10.1590/s0103-84782008000300036

Cited by 7 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The use of intervals of 15 to 45 minutes between pumping periods of 45 minutes altered the dry weight of the root system in an experiment conducted in Rio Grande do Sul, Brazil, with the highest values between 0.76 and 0.83 g per plant, and the treatment 45/45 minutes showed the best result (LUZ et al, 2008). Similar results were found for lettuce plants of the cultivar Regina that presented total dry weight of 9.7 g per plant during the spring (BACKES et al, 2003) and 7.1 g per plant during the autumn (CARON et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

Periodicity of Exposure of Hydroponic Lettuce Plants to Nutrient Solution1

2020

View full text Add to dashboard Cite

A balanced periodicity of the nutrient solution flow is essential for better agronomic performances and low production costs in hydroponic systems. Thus, the objective of this work was to evaluate the effect of periodicity of exposure of lettuce plants to the nutrient solution in an NFT hydroponic system on the production, nutrition, and profitability of this crop. The experiment was conducted in a randomized block design with five replications. The treatments consisted of four periodicities of exposure of lettuce plants to the nutrient solution, consisting of intervals of 60, 30, and 15 minutes between pumping periods of 15 minutes; and uninterrupted flow of the nutrient solution. The plants were harvested at 30 days after transplanting, and 15 lettuce plants of each experimental plot were used to determine total fresh weight; root fresh weight; shoot freshweight; and contents of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, and Zn in shoots, roots, and in the diagnostic leaf; accumulation of these nutrients in shoots and roots; and nitrate and ammonium contents in plant shoot. The highest production and profitability of lettuce were found using uninterrupted nutrient solution flow, which provided higher shoot and root nutrient contents to plants, and resulted in a better nutrient use efficiency.

show abstract

Section: Resultsmentioning

confidence: 99%

Periodicity of Exposure of Hydroponic Lettuce Plants to Nutrient Solution1

2020

View full text Add to dashboard Cite

show abstract

“…Studies on frequency of irrigation for lettuce grown in substrate are scarce, with few studies about hydroponic system, which the greatest production obtained with the highest frequencies, with 5 minutes-interval between irrigations (Zanella et al, 2008). However, Luz et al (2008) observed that lettuce production in NFT hydroponic system may be realized using 45 minutes-interval between irrigations, with no significant yield loss and reducing costs with energy (42.1%).…”

Section: Resultsmentioning

confidence: 99%

Lettuce Growth in Different Pot Volumes and Irrigation Frequencies Under Saline Stress

Targino¹,

Oliveira²,

Oliveira³

et al. 2019

JAS

View full text Add to dashboard Cite

This study aimed to evaluate lettuce production in different pot volumes and different irrigation frequency under saline stress. The experiment was carried out at the Department of Environmental and Technological Sciences of the Federal Rural University of the Semi-Arid, in Mossoró, RN, Brazil. Randomized block experimental design was used in factorial scheme of 2 × 3 × 3, with 3 replicates. Treatments were consisted of 2 water’s salinity levels (0.5 and 2.0 dS m-1), 3 frequencies of irrigation (6, 9, and 12 daily events), and 3 different pots (0.5, 1.0, and 3.0 L). Data from parameters evaluated at harvest were submitted to variance analysis and means were compared. We verified that when the lower saline water (0.5 dS m-1) was used lettuce production increased when cultivated in pots of 3.0 L and submitted to 6 daily events of irrigation. When 3.0 dS m-1 water was used the best results were obtained in 0.5 L and nine daily events of irrigation. The combination of 0.5 L pot and six or nine daily events of irrigation better inhibited the damaging effects of salinity.

show abstract

“…On the other hand, ShDM bunch production was uniform at 10, 21 and 25 DAT, i.e., at both high (0.25 h) and low (8 h) frequencies, the yield occurred at the same level ( Figure 4B), showing that the intervals for nutrient solution recirculation used in the present study were able to meet crop water demand. The reduction in the number of irrigation events promoted lower energy consumption in the study of Luz et al (2008); according to the authors, irrigation intervals did not promote significant differences in ShDM of lettuce plants under NFT hydroponics.…”

Section: Bmentioning

confidence: 86%

Frequency of recirculation of nutrient solution in hydroponic cultivation of coriander with brackish water

Silva

Soares

Gheyi

et al. 2016

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

A B S T R A C TThe 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 -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 -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.Frequências de recirculação de solução nutritiva no cultivo hidropônico de coentro com água salobra R E S U M O Neste trabalho foi utilizado um sistema hidropônico com os canais de cultivo em nível com o objetivo de avaliar a cultura do coentro submetida a diferentes intervalos para recirculação da solução nutritiva em interação com o uso de água doce e salobra. O experimento foi conduzido em blocos casualizados com cinco repetições, em esquema fatorial 2 x 4, entre fevereiro e março de 2014. Avaliaram-se dois níveis de condutividade elétrica (CE) da água: 0,32 e 4,91 dS m -1 , além de quatro frequências de recirculação da solução nutritiva (intervalos de 0,25; 2; 4 e 8 h). Este delineamento experimental foi aplicado nas avaliações realizadas aos 10, 15 e 25 dias após o transplantio (DAT). Adicionalmente, aos 21 DAT foram estabelecidas subparcelas visando avaliar o efeito da posição das plantas (inicial, intermediária e final) nos perfis hidropônicos. É viável adotar-se recirculação da solução nutritiva a cada 8 h sem perdas de produção. O uso da água salobra (CE = 4,91 dS m -1 ) pode ser uma alternativa para o cultivo do coentro hidropônico, mesmo com reduções na produção, porém sem efeitos depreciativos à qualidade visual do produto. As plantas cultivadas nas posições inicial e intermediária dos perfis hidropônicos apresentaram maior produção.

show abstract

Consumo de energia elétrica e produção de alface hidropônica com três intervalos entre irrigações

Abstract: RESUMO Com o objetivo de avaliar a ação do regime de irrigação na produção da alface cv. "Regina" em sistema hidropônico NFT, foi conduzido um experimento no

Cited by 7 publications

References 1 publication

Periodicity of Exposure of Hydroponic Lettuce Plants to Nutrient Solution1

Periodicity of Exposure of Hydroponic Lettuce Plants to Nutrient Solution1

Lettuce Growth in Different Pot Volumes and Irrigation Frequencies Under Saline Stress

Frequency of recirculation of nutrient solution in hydroponic cultivation of coriander with brackish water

Contact Info

Product

Resources

About