Nitrate content of lettuce (<i>Lactuca sativa</i>L.) after fertilization with sewage sludge and irrigation with treated wastewater

Castro, Elías Hernández; Mañas, Maria Pilar; Heras, Jorge de las

doi:10.1080/02652030802425334

Cited by 20 publications

(9 citation statements)

References 14 publications

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“…Data from a recent experiment on plant growth rates in a multi-loop aquaponic system (Goddek & Vermeulen 2017) was used to derive the nitrate uptake of the lettuce (Table 7.3). The uptake observations were consistent with the ones reported by Castro et al (2009) and Mathieu et al (2006). The formula for sizing one-loop aquaponic systems according to given rule of thumb is:…”

Section: Recirculating Aquaculture Systemsupporting

confidence: 89%

Opportunities and Challenges of Multi-Loop Aquaponic Systems

Goddek

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v Preface Which of us is not familiar with this situation during the student time: on a Wednesday night, one wants to go out to grab a beer ("just one Duveltje") with friends. Until the end of the night (and several beers later) one was trapped in several discussions about religion, politics, and one's field of study. I have to admit, that I have been involved in plenty of such discussions, which also stems from the fact that I am a very discussion-friendly and curious person. However, I caught myself often saying the same sentence "well, the idea is great, but it actually does not really work as it should" with respect to two topics: Aquaponics and Communism. This might appear to be a somewhat far-fetched statement, however, for those who have neither read Marx nor followed the development of aquaponics the last 30 years: in a nutshell it can be stated that both of these ideas follow bottom-up (i.e. local and circular) approaches (i.e. for small farmers and individuals).Additionally to the above, I honestly believe that in times of the financial crisis -in which multinational corporations such as [think of big corporations that produce GMO seeds that are immune to their pesticides] increase their quasi-monopoly positions on the global food market -a paradigm shift back to human-centred and sustainable agricultural development is required to ensure both (1) healthy (i.e. pesticide free) diets and (2) food independence. In contrast, organic, fair trade, and GMO-free food have recently gained rapidly increasing popularity. Consumers want transparent and extensive information about the origin and manufacture of the foodstuffs they buy. The development of agriculture and how to use (finite) resources efficiently will be crucial with respect to the global development and the future of the earth in general. Right now, we are at a crossroads in our history that will determine whether either the people or the corporations will be empowered. I intended to provocatively illustrate this new class conflict on the book cover with the objective to polarize and thus energize the readers themselves to make thoughts and reflections.So far, I have dedicated over 4 years of my life to study and improve aquaponic systems in the hope that one day their production efficiency will be able to compete with state-of-theart hydroponic food production systems, while improving circularity. In this thesis, I will try to demonstrate why aquaponics does not face the same pitfalls as communism, while sharing the empowering people-minded and bottom-up qualities that are required in the 21st century.

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Section: Recirculating Aquaculture Systemsupporting

confidence: 89%

Opportunities and Challenges of Multi-Loop Aquaponic Systems

Goddek

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“…Since in lettuce L. sativa, protected or open grown, harvested in the period from October 1 to March 31 the limit amount of nitrates is 4,500 ppm expressed on the fresh weight basis, Bio-algeen S-90 or Megagreen are obviously great treatments for nitrate-related toxicity reduction of lettuce. Compared to the sewage sludge used by Castro et al (2009), and mineral (94% Ca(NO 3 ) 2 + 6% NH 4 NO 3 ) and organic (biostabilised compost) fertilizers used by Premuzic et al (2001), in terms of nitrate concentration, Megagreen fertilizer would be a better choice for lettuce production.…”

Section: Discussionmentioning

confidence: 97%

“…As far as we know, the possible application of these two preparations in the winter production of leafy vegetables, including lettuce has not been tested so far. As for the production of lettuce, it has been proven that organic fertilizers are more suitable than inorganic ones in lettuce cultivation in river sand (Masarirambi et al 2010), that toxic nitrate concentration in romaine-type lettuce increases after fertilization with sewage sludge (Castro et al 2009), and that mineral fertilization increases the nitrate concentration in the lettuce cultivar Mantecosa (Premuzic et al 2001).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Biostimulant and Fertilizer on “Low Input” Lettuce Production

Dudaš

Šola

Sladonja

et al. 2016

Acta Botanica Croatica

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-Lettuce production in the winter on the Adriatic coast, especially in a non-heated plastic tunnel, requires longer cultivation and is characterised by lower head mass and yield. In these conditions, the effect of biostimulant Bio-algeen S-90 and fertilizer Megagreen on the production of the traditional winter lettuce cultivar 'Four Seasons' was tested. Both treatments showed a positive effect on the growth and total yield of winter lettuce, and decreased the share of non-marketable yield. Bio-algeen S-90 treatment increased the plant height by 61.5%, and foliar treatment with Megagreen by 60.9%, as compared to the control treatment. Equally, both treatments resulted in higher leaf numbers (47.7% for Bio-algeen S-90 and 37.2% for Megagreen). The head mass of lettuce treated with Bio-algeen S-90 and Megagreen was 30.3% and 25.0% higher than in the control treatment, respectively. Megagreen contributed more to chlorophyll and carotenoid content, while Bio-algeen S-90 elevated the amount of vitamin C and dry matter. The pH value of lettuce juice decreased after Bio-algeen S-90, while the mineral content (N, P and K) did not differ between the tested treatments. Lower nitrate content was detected after both treatments. The obtained results elucidate the effect of Bio-algeen S-90 and Megagreen on "low input" lettuce production.

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“…3 that the cultivars Thaís and Verônica presented the highest levels of nitrate and the latter did not differ statically from the Vanda cultivar. Castro et al (2009) compared the nitrate levels of lettuce leaves and reported higer nitrate levels compared to this study, possibly due to nitrate concentration in the vegetal tissues occurred through using sewage sludge. As for the isolated effect of the solutions (Fig.…”

Section: Source Of Variation Gfmentioning

confidence: 44%

Evaluation of vitamin C, nitrate and chlorophyll content determined in lettuce (Thaís, Vanda, Verônica) cultivated in hydroponic system using wastewater

Xavier

Azevedo

et al. 2019

Aust J Crop Sci

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The objective of this work was to determine the levels of vitamin C, nitrate and chlorophyll in three lettuce cultivars in a hydroponic system using waste- and well-water. The experiment was conducted in a hydroponic system using laminar flow technique and nutrients in a protected environment. The experimental design was randomized blocks with treatments set up in split-plots with three replications, whose main plots devoted to lettuce cultivars and sub-plots to hydroponic solutions. The experimental solutions consisted of 7 nutrients (S): S1=Furlani solution, S2=domestic wastewater, S3=optimized domestic wastewater, S4 =well water S5 =optimized well water; S6 = reactor wastewater solution and S7 =optimized reactor wastewater solution and the subplot for the three cultivars of iceberg lettuce (Verônica, Vanda, and Thais). The following variables were determined: nitrate, vitamin C and chlorophyll content using the method described by Lichtenthaler. The results indicated that highest content of vitamin C was found in the Vanda cultivar using the S1 solution. For Veronica cultivar, the highest levels of vitamin C were observed at solutions S1, S2, S3, S4, and S7. The solutions S2 and S3 did not differ from one another in all three cultivars. For the Vanda cultivar, solutions S1, S4 and S7 were the ones that promoted the highest levels of nitrate, 4.61; 3, 32 and 2.64 g kg-1, respectively. Evaluating the effect of the solution within the cultivars, we verified that the highest nitrate values obtained from S2 nutrition for cultivars Thais and Verônica. Regarding the S5 solution, the Verônica cultivar presented the highest concentration of this nutrient. The cultivate Thaís, the highest contents of chlorophyll b were found in solutions S7, S6, S4, S3 and S2, where they did not differ significantly. Regarding to Vanda cultivar the highest values of chlorophyll b were present in solutions S2 and S5. The Verônica cultivar independent of the solution used presented the same values of this pigment.

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Nitrate content of lettuce (Lactuca sativaL.) after fertilization with sewage sludge and irrigation with treated wastewater

Cited by 20 publications

References 14 publications

Opportunities and Challenges of Multi-Loop Aquaponic Systems

Opportunities and Challenges of Multi-Loop Aquaponic Systems

The Effect of Biostimulant and Fertilizer on “Low Input” Lettuce Production

Evaluation of vitamin C, nitrate and chlorophyll content determined in lettuce (Thaís, Vanda, Verônica) cultivated in hydroponic system using wastewater

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