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Effects of Fish Stocking Density on Water Quality, Growth Performance of Tilapia and Yield of Butterhead Lettuce Grown in Decoupled Recirculation Aquaponic Systems

Al Tawaha Abdel Razzaq, Wahab Puteri Edaroyati Megat, Jaafar Hawa Binti, Zuan Ali Tan Kee, Hassan Mohd Zafri

Journal of Ecological Engineering

2021

Vol. 22, nr 1

8--19

This study was conducted over a period of 52 days to determine the effects of fish stocking density on the water quality, growth performance of tilapia and yield of butterhead lettuce cultivated in decoupled recirculation aquaponic systems (DRAPS). In this study, three respective tilapia stocking densities (treatments) of 8 kg•m-3, 10 kg•m-3, and 12 kg•m-3 were used to evaluate the butterhead lettuce in the DRAPS, which consist of two independent loops. All treatments were done in triplicates. The results showed with increased stocking density, the electrical conductivity, total dissolved substances and salinity increased and dissolved oxygen decline. The results showed that the highest stocking density produced the highest nutrients accumulation of ammonia-nitrogen (NH3-N), ammonium (NH4), nitrite-nitrogen (NO2-N) and nitrate-nitrogen (NO3-N) and potassium (K) except for phosphorus (P). Nevertheless, based on the conversion of fish feed to NO3-N and P per kilogram of feeds, the lowest stocking density provided the highest concentration of NO3-N and P. It was documented that DRAPS relied solely on the fish waste produced an insufficient concentration of N, P, K and iron. The average survival rate of tilapia in all treatments was above 94% and was not a significant difference among the treatments.

Yield and Nutrients Leaf Content of Butterhead Lettuce (Lactuca Sativa) in Response to Fish Nutrient Solution in a Small Scale of Aquaponic Systems

Al Tawaha Abdel Razzaq, Megat Wahab Puteri Edaroyati, Binti Jaafar Hawa, Kee Zuan Ali Tan, Hassan Mohd Zafri, Al-Tawaha Abdel Rahman M.

Ecological Engineering & Environmental Technology

2021

Vol. 22, iss. 6

85--94

This study was conducted over 52 days to evaluate the potential of using the nutrient solution produced from different fish stocking densities on the yield and nutrients leaf content of lettuce cultivated in decoupled recirculation aquaponic systems (DRAPS). In this study, three stocking densities of tilapia were used 8, 10 and 12 kg m-3, respectively. The result showed the highest total yield 448 g m-2 was obtained at a low stocking density. Also, it has been showing that with an increased fish stocking density, the leaf nutrient content of butterhead lettuce for potassium, calcium, magnesium, sodium, iron and copper was increased. While for the nitrogen, phosphorus and manganese, the higher leaf content was obtained at lower stocking density. Considering the lettuce yield, leaf nutrient contents and nitrogen dynamics, the stocking density of 8 kg m-3 could be suggested as the ideal stocking density for DRAPS.

Effect of Shading with Various Coloured Films on the Yield and Quality of Celery and Butterhead Lettuce

Siwek P., Wojciechowska R., Kalisz A., Libik A., Gryza I.

Ecological Chemistry and Engineering. A

2010

Vol. 17, nr 12

1619-1627

In 2005–2007 at the University of Agriculture in Krakow field experiments with shading with polyethylene films were carried out on medium-early celery ‘Tango’ cultivar and butterhead lettuce ‘Melodion’ cultivar. Shadings with transparent, white and black films made from original and recycled materials were fixed on low tunnel structures on 7 days before harvesting lettuce (from 23.05.2005. and 23.05.2006, respectively) and on 10–12 days before harvesting celery (from 29.06.2005, 1.07.2006 and 25.06.2007, respectively). The best elongation growth of celery was shown under white film which also slightly increased the yield of celery stalks. In relation to yielding of celery in 2005 best effect was obtained under white film, in the next year under transparent and white film and in the last year of the experiment the yield was even in all objects with small advantage under white film. Shading lettuce with transparent film for 7 days before harvest increased the yield and soluble sugars content in plants. With the decrease of PAR permeability through films dry matter, soluble sugars and ascorbic acid content decreased in celery and lettuce. No differences were shown in the growth, quality and yield of celery and lettuce grown under films made from original and recycled materials.

W latach 2005–2007 wykonano w Uniwersytecie Rolniczym w Krakowie doświadczenia polowe z cieniowaniem folią polietylenową roślin selerów naciowych odm. ‘Tango’ i sałaty masłowej odm. ‘Melodion’. Cieniowanie folią bezbarwną, białą i czarną, wyprodukowaną z surowców oryginalnych i recyklingowych w przypadku sałaty wykonywano na tydzień przed zbiorem (odpowiednio od 23.05.2005 r. i 23.05.2006 r.), a w przypadku selerów 10–12 dni przed zbiorem (odpowiednio od 29.06.2005 r., 1.07.2006 r. i 25.06.2007 r.). Wzrost elongacyjny selera naciowego był najsilniejszy pod folią białą, która powodowała także nieznaczne zwiększenie plonu ogonków liściowych. Pod względem plonowania w 2005 r. najlepszy wynik uzyskano pod folią białą, w kolejnym pod bezbarwną i białą, a w ostatnim plon był wyrównany we wszystkich obiektach, z niewielką przewagą obiektów, w których stosowano folię białą. Cieniowanie roślin sałaty bezbarwną folią na tydzień przed zbiorem spowodowało wzrost plonu oraz zawartości cukrów rozpuszczalnych. Wraz ze zmniejszaniem przepuszczalności folii dla promieniowania fotosyntetycznie czynnego, zawartość suchej masy, cukrów i kwasu askorbinowego w selerach i sałacie zmniejszała się. Rodzaj surowca stosowanego do produkcji folii nie miał wpływu na wzrost, plonowanie i jakość selerów i sałaty.