Nutrients in lettuce production in aquaponics with tilapia fish compared to that with hydroponics

Duarte, Eglerson; Silva, Enilson de B.; Moreira, Fernanda da C.; Braga, Dermeval; Santos, Shara G. dos

doi:10.1590/1983-21252023v36n103rc

Eglerson Duarte ^**Corresponding author: <eglerson.duarte@ufvjm.edu.br>

Department of Agronomy, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil.

https://orcid.org/0000-0001-6744-4309

Enilson de B. Silva

Department of Agronomy, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil.

https://orcid.org/0000-0002-2088-9965

Fernanda da C. Moreira

Department of Agronomy, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil.

https://orcid.org/0000-0002-1728-3284

Dermeval Braga

Department of Agronomy, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil.

https://orcid.org/0000-0002-5803-9480

Shara G. dos Santos

Department of Agronomy, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil.

https://orcid.org/0000-0002-5887-7943

*Corresponding author: <eglerson.duarte@ufvjm.edu.br>

Conflict of interest

The authors declare no conflict of interest related to the publication of this manuscript.

Figures (5)
Tables (1)

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Figure 1
Flowchart of the six lettuce crops in an aquaponic system containing tilapia fingerlings.

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Figure 2
Ammonium (A), nitrate (B), and alkalinity (C) concentrations in the water bearing six lettuce crops grown for 30 days in an aquaponic and hydroponic system. The bars at each crop with the same letter are not significantly different according to the F test at a 5% level. Data are means ± confidence intervals (n = 12).

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Figure 3
‘Head’ diameter (A), number of leaves (B), dry leaf weight (C), shoot dry weight (D), Root dry weight (E), and total dry weight (F) of six 30 days old lettuce crops grown in an aquaponic and hydroponic system. The bars at each crop with the same letter are not significantly different according to the F test at a 5% level. Data are means ± confidence intervals (n = 12).

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Figure 4
Nutrient concentration in lettuce leaves in six30days old crops, in aquaponic and hydroponic systems. The critical range (MARTINEZ, 1999MARTINEZ, H. E. P. Hidroponia. In: RIBEIRO, A. C.; GUIMARÃES, P. T. G.; ALVAREZ, V. V. H. (Eds.). Recomendações para o uso de corretivos e fertilizantes em Minas Gerais: 5ª aproximação. Viçosa, MG: CFSEMG, 1999, v. 1, cap. 16, p. 131-166.) of crop nutrients is represented by perpendicular lines. The bars at each crop with the same letter are not significantly different according to the F test at a 5% level. Data are means ± confidence intervals (n = 12).

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Figure 5
Nutrient accumulation in the total dry weight of six 30days old lettuce crops in aquaponic and hydroponic systems. The bars at each crop with the same letter are not significantly different according to the F test at a 5% level. Data are means ± confidence intervals (n = 12).

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Table 1
Average values of temperature from the nutrient solution and the environment, pH, electrical conductivity, and nutrient contents at 0 and 30 days in the aquaponic system, in six 30 days old lettuce crops grown with tilapia.

Crops	C1		C2		C3		C4		C5		C6
Days	0	30	0	30	0	30	0	30	0	30	0	30
Temp. H₂0 (C°)	23±2.8		24±1.8		26±1.3		26±1.9		24±2.5		25±4.0
Temp. Env. (C°)	25±6.5		22.4±6.7		21±5.0		21±5		15±5.0		14±.4.2
pH	7.0	7.3	7.7	7.7	7.7	7.7	7.6	7.3	7.0	7.3	7.2	7.3
		dS m-¹ to 25°C
Conductivity	0.50	0.68	0.78	0.70	0.75	0.70	0.73	0.70	0.50	0.47	0.52	0.39
		Macronutrients (mg L^-1)
Ammonium	2.92	2.92	2.92	2.92	2.92	2.19	2.19	1.46	2.92	2.92	2.92	2.19
Nitrate	13.84	10.20	3.65	3.65	3.65	6.57	6.57	13.15	13.84	10.23	10.20	5.84
P	40.00	38.50	23.00	18.00	18.00	30.20	30.20	40.20	49.09	20.19	20.19	14.81
K	12.30	15.30	13.06	13.06	13.06	13.06	13.06	15.30	14.14	12.59	12.59	13.54
Ca	21.24	169.97	157.22	135.97	135.97	123.22	123.22	108.35	51.44	46.62	46.62	35.44
Mg	4.87	5.63	4.88	6.00	6.00	7.13	7.13	7.13	3.13	8.15	8.15	8.32
S	1.32	4.94	28.86	26.70	26.70	16.50	16.50	6.88	3.28	8.58	8.58	8.71
		Micronutrients (µg L^-1)
B	0.23	62.00	216.00	60.00	210.00	59.00	210.00	63.00	210.00	58.80	214.00	64.20
Cu	0.10	0.10	0.10	0.01	0.01	0.01	0.01	0.01	31.00	9.30	30.00	9.00
Fe	0.01	580.00	1955.00	574.00	1950,00	578.00	1952.00	585.6	1953.00	527.31	1950.00	526.50
Mn	0.01	0.01	0.76	0.01	0.01	0.01	0.01	0.01	275.00	82.50	272.00	81.60
Zn	0.01	0.25	0.19	0.03	0.03	0.16	0.16	0.06	46.00	13.80	47.20	14.16
± Confidence interval

[1] *Corresponding author: <eglerson.duarte@ufvjm.edu.br>

Brasil

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Nutrients in lettuce production in aquaponics with tilapia fish compared to that with hydroponics

Nutrientes na produção de alface em aquaponia com peixes tilápia em comparação com hidroponia

ABSTRACT