Effects of Nutrient Composition and Lettuce Cultivar on Crop Production in Hydroponic Culture

Sapkota, Sundar; Sapkota, Sanjib; Liu, Zhiming

doi:10.3390/horticulturae5040072

Cited by 92 publications

(69 citation statements)

References 28 publications

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“…The highest yield of lettuce due to high concentrations of nitrate in solution was also verified by Kov ik et al (2014), Galieni et al (2015), Qadir et al (2017) and Sapkota and Liu (2019) who found that there was higher yield with high nitrate levels, and reduction in productivity of plants and slow growth at lower nitrate concentrations. In this context, it is notorious that the increase in nitrogen availability is a major factor in the accumulation of nitrate in plants, reinforcing the point proposed in the literature by Chen et al (2004), Gülser (2005), Turan and Sevimli (2005) and Pôrto et al (2008).…”

Section: Discussionmentioning

confidence: 57%

Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon

Wenceslau¹,

Oliveira²,

Rabelo³

et al. 2021

Afr. J. Agric. Res.

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Lettuce has a predisposition to nitrate accumulation and has led many researchers to develop research to reduce this accumulation. The objective of this study was to evaluate the effect of nitrate concentration (NO 3 -) and nitrate/ammonium ratio (NO 3 -:NH 4 +) on growth, production and accumulation of these nitrogen compounds in lettuce grown in a hydroponic system in southern Amazon. There were performed two experiments with Iceberg lettuce type, in a floating-hydroponic system under protected cultivation. In the first experiment, five nitrate concentrations (2.5, 5.0, 7.5, 10.0 and 15.0 mmol L -1 ) were evaluated. In the second experiment, the best NO 3 -: NH 4 + ratio was evaluated with five proportions 0:100, 25:75, 50:50, 75:25 and 100:0 in the nutrient solution. At 35 days after transplanting, the evaluations were performed. The nutrient solution containing nitrogen (N) as nitrate source in the concentration of 15.0 mmol L -1 contributed to higher lettuce productivity, being the concentration recommended for hydroponic grown system in southern Amazon. It is recommended to use about 23% of the N in nutrient solution in ammonium form, where higher N-ammonium concentrations are not indicated for Icebeg lettuce type because it reduces the productivity of this green leaf vegetable, causing toxicity symptoms.

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Section: Discussionmentioning

confidence: 57%

Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon

Wenceslau¹,

Oliveira²,

Rabelo³

et al. 2021

Afr. J. Agric. Res.

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“…Observing the data presented in the literature, where vegetables, such as lettuce, which received higher concentrations of nitrogen had leaves with a more intense green color (Rodrigo-García et al, 2019;Sapkota et al, 2019), greater antioxidant activity (Zambrano-Moreno et al, 2015). In addition to having increased concentrations in the contents of phenolics and flavonoids, in organic and hydroponic cultivation systems compared to the conventional system.…”

Section: Resultsmentioning

confidence: 98%

Bioactive compounds and antioxidant activity of crisphead lettuce (Lactuca sativa L.) of three different cultivation systems

et al. 2021

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Lettuce is a vegetable most consumed and produced on a large scale in the world, it deserves special attention for its nutritional and functional value. Cultivated in the conventional, hydroponic and organic method, it presents different characteristics in production, which may influence the composition of this vegetable. It is indisputable that regular consumption of vegetables is beneficial due to the presence of bioactive compounds with antioxidant properties that protect and promote human health. In this study, the total phenolic compound, flavonoid, and tannin contents, as well as the antioxidant activities of lettuce samples from conventional, hydroponic, and conventional cultivars were analyzed. An extract was prepared using 80% acetone. The contents of total phenolic compounds, flavonoids, and tannins were determined. The antioxidant activity was determined by the radical capture method using DPPH. It was observed that the organic cultivation system had the highest values of ash, protein, total phenolic compounds, flavonoids and antioxidant activity, followed by the hydroponic system. The organic system presented greater protein content and higher content of bioactive compounds, justifying the high antioxidant activity. Therefore, the organic farming system favors the highest concentration in the content of bioactive compounds and antioxidant activity.

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“…1). Whereas soil-based agriculture is more robust, the use of hydroponic systems for the production of vegetables enables faster growth, higher product quality and needs less space (Sapkota, 2019).…”

Section: Introductionmentioning

confidence: 99%

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study

Meinusch

Krämer

Koerner

et al. 2021

Preprint

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Progressive global warming is one of the biggest challenges civilization is facing today. The establishment of a carbon dioxide (CO2)-neutral society based on sustainable value creation cycles is required to stop this development. The Integrated Cycles for Urban Biomass (ICU) concept is a new concept towards a CO2-neutral society. The integration of closed biomass cycles into residential buildings enable efficient resource utilization and avoid transport of biowaste. In this scenario, biowaste is degraded on-site into biogas that is converted into heat and electricity. The liquid fermentation residues are upgraded by nitrification processes (e.g., by a soiling®-process, EP3684909A1) to refined fertilizer, which can be used subsequently in house-internal gardens to produce fresh food for residents.Whereas this scenario sounds promising, comprehensive evaluations of produced amounts of biogas and food, saved CO2 and costs as well as social-cultural aspects are lacking. To assess these points, a feasibility study was performed, which estimated the material and energy flows based on simulations of the biogas process and food production.The calculations show that a residential complex with 100 persons can generate 21 % of the annual power (electrical and heat) consumption from the accumulated biowaste. The nitrogen (N) in the liquid fermentation residues enables the production of up to 6.3 t of fresh mass of lettuce per year in a 70 m2 professional hydroponic production area. The amount of produced lettuce corresponds to the amount of calories required to feed four persons for one year. Additionally, due to the reduction of biowaste transport and the in-house food and fertilizer production, 6 468 kg CO2-equivalent (CO2-eq) per year are saved compared to a conventional building. While the ICU concept is technically feasible, its costs are still 1.5 times higher than the revenues. However, the model predictions show that the ICU concept becomes economically feasible in case food prices further increase and ICU is implemented at larger scale, e.g.; at the district level. Finally, this study demonstrates that the ICU implementation can be a worthwile contribution towards a sustainable CO2-neutral society and enable to decrease the demand for agricultural land.

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Effects of Nutrient Composition and Lettuce Cultivar on Crop Production in Hydroponic Culture

Cited by 92 publications

References 28 publications

Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon

Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon

Bioactive compounds and antioxidant activity of crisphead lettuce (Lactuca sativa L.) of three different cultivation systems

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study

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Effects of Nutrient Composition and Lettuce Cultivar on Crop Production in Hydroponic Culture

Cited by 92 publications

References 28 publications

Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon

Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon

Bioactive compounds and antioxidant activity of crisphead lettuce (Lactuca sativa L.) of three different cultivation systems

Integrated cycles for urban biomass as a strategy to promote a CO2-neutral society – a feasibility study

Contact Info

Product

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Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study