Nutrient supplementation increased growth and nitrate concentration of lettuce cultivated hydroponically with biogas slurry

Liu, Wen Ke; Yang, Qi; Lian, Du; Cheng, Rui Feng; Zhou, Wan Lai

doi:10.1080/09064710.2010.482539

Cited by 29 publications

(24 citation statements)

References 6 publications

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“…In the current experiment, increasing the Fe concentration in the nutrient solution from 0.015 to 2.0 mM increased the nitrate content in red Salanova (by 8.8%) but especially in green Salanova (by 27.3%) plants ( Table 2). Similar results have been reported by Liu et al [57] who also suggested a positive correlation between Fe supplementation and nitrate content in hydroponically grown lettuce leaves. The high nitrate uptake and accumulation under high Fe availability has been attributed to a molecular mechanism involved in the up-regulation of LATS gene (coding for a low-affinity NO 3 − transporter) observed in corn salad grown in a floating raft system [58].…”

Section: Nitrate Content Mineral Composition and Iron Biofortificationsupporting

confidence: 91%

Iron Biofortification of Red and Green Pigmented Lettuce in Closed Soilless Cultivation Impacts Crop Performance and Modulates Mineral and Bioactive Composition

et al. 2019

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Consumer demand for vegetables of fortified mineral and bioactive content is on the rise, driven by the growing interest of society in fresh products of premium nutritional and functional quality. Biofortification of leafy vegetables with essential micronutrients such as iron (Fe) is an efficient means to address the human micronutrient deficiency known as hidden hunger. Morphometric analysis, lipophilic and hydrophilic antioxidant capacities of green and red butterhead lettuce cultivars in response to Fe concentration in the nutrient solution (0.015 control, 0.5, 1.0 or 2.0 mM Fe) were assessed. The experiment was carried out in a controlled-environment growth chamber using a closed soilless system (nutrient film technique). The percentage of yield reduction in comparison to the control treatment was 5.7%, 13.5% and 25.3% at 0.5, 1.0 and 2.0 mM Fe, respectively. Irrespective of the cultivar, the addition of 1.0 mM or 2.0 mM Fe in the nutrient solution induced an increase in the Fe concentration of lettuce leaves by 20.5% and 53.7%, respectively. No significant effects of Fe application on phenolic acids and carotenoid profiles were observed in green Salanova. Increasing Fe concentration in the nutrient solution to 0.5 mM triggered a spike in chlorogenic acid and total phenolics in red Salanova lettuce by 110.1% and 29.1% compared with the control treatment, respectively; moreover, higher accumulation of caffeoyl meso tartaric phenolic acid by 31.4% at 1.0 mM Fe and of carotenoids violaxanthin, neoxanthin and β-carotene by 37.0% at 2.0 mM Fe were also observed in red Salanova compared with the control (0.015 mM Fe) treatment. Red Salanova exhibited higher yield, P and K contents, ascorbic acid, phenolic acids and carotenoid compounds than green Salanova. The wok shows how nutrient solution management in soilless culture could serve as effective cultural practices for producing Fe-enriched lettuce of premium quality, notwithstanding cultivar selection being a critical underlying factor for obtaining high quality products.

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Section: Nitrate Content Mineral Composition and Iron Biofortificationsupporting

confidence: 91%

Iron Biofortification of Red and Green Pigmented Lettuce in Closed Soilless Cultivation Impacts Crop Performance and Modulates Mineral and Bioactive Composition

et al. 2019

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“…Undiluted digestates with high electrical conductivity are not suitable . The key problems obstructing their application in soilless culture are the variability of components and the imbalance in the elemental composition . Appropriate dilutions are 1:4 to 1:8 (digestate:water) .…”

Section: Digestates As Fertilizers For Vegetable Cropsmentioning

confidence: 99%

“…This was necessary because of the high sensitivity of tomatoes to high NH 4 + ‐N levels, and the low content and availability of Mg in digestates , due to struvite formation and precipitation during AD. Other studies have reported that supplementation by addition of P and micronutrients (particularly Fe) increases the shoot biomass of lettuce . Such a supplementation balances the relative P deficiency compared to N and improves Fe availability .…”

Section: Digestates As Fertilizers For Vegetable Cropsmentioning

confidence: 99%

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Effects of anaerobic digestion on digestate nutrient availability and crop growth: A review

Möller

Müller²

2012

Engineering in Life Sciences

1,014

650

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Anaerobic digestion (AD) for biogas production leads to several changes in the composition of the resulting digestates compared to the original feedstock (ammonia content, pH, carbon to nitrogen ratio, etc.), which are relevant for the plant availability of macro-and micronutrients after field application. Increased NH 4 + -N content in digested slurries compared to undigested slurries does not guarantee improved uptake efficiency of slurry nitrogen and increased savings in fertilizer nitrogen. AD of crop residues and cover crops leads to an increase in the total amounts of mobile organic manures within the farming system, resulting in a higher nitrogen use efficiency and an increased scope for target-oriented nitrogen application in time and space, when needed by the crop, as an alternative to the site-bound soil incorporation as green manures. AD of dairy manure appears to reduce the fraction of immediate plant available phosphorus and micronutrients. This does, however, not affect short-term crop availability under field conditions. More studies are needed to improve current knowledge on sulfur losses during AD and fertilizer value of digestates.

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“…Comparing the total nitrogen (T N = NH 4 − N + NO 2 − N + NO 3 − N) between the digested wastewater (50% diluted) and the raw wastewater, there was higher ammonium-N content in the digested wastewater, 171.50 ppm compared to 7.23 ppm ( Table 3). The ammonium content of the digested wastewater was similar to that used in the inorganic fertilizer control and within the 100-250 ppm recommended range [35,36]. The only concerning factor was that the N ratio (R N = NH 4 − N/NO 3 − N) [37] was extremely high: >1000, and since all the N was in the form of ammonium, this could generate problems of ammonia toxicity and yield reduction [38,39], though this was not observed.…”

Section: Water Testmentioning

confidence: 68%

Anaerobically-Digested Brewery Wastewater as a Nutrient Solution for Substrate-Based Food Production

et al. 2019

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Urban agriculture, due to its location, can play a key role in recycling urban waste streams, promoting nutrient recycling, and increasing sustainability of food systems. This research investigated the integration of brewery wastewater treatment through anaerobic digestion with substrate-based soilless agriculture. An experiment was conducted to study the performance of three different crops (mustard greens (Brassica juncea), basil (Ocimum basilicum), and lettuce (Lactuca sativa) grown with digested and raw brewery wastewater as fertilizer treatments. Mustard greens and lettuce grown in digested wastewater produced similar yields as the inorganic fertilizer control treatment, while basil had slightly lower yields. In all cases, crops in the digested wastewater treatments produced higher yields than raw wastewater or the no fertilizer control, indicating that nutrients in the brewery wastewater can be recovered for food production and diverted from typical urban waste treatment facilities.

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Nutrient supplementation increased growth and nitrate concentration of lettuce cultivated hydroponically with biogas slurry

Cited by 29 publications

References 6 publications

Iron Biofortification of Red and Green Pigmented Lettuce in Closed Soilless Cultivation Impacts Crop Performance and Modulates Mineral and Bioactive Composition

Iron Biofortification of Red and Green Pigmented Lettuce in Closed Soilless Cultivation Impacts Crop Performance and Modulates Mineral and Bioactive Composition

Effects of anaerobic digestion on digestate nutrient availability and crop growth: A review

Anaerobically-Digested Brewery Wastewater as a Nutrient Solution for Substrate-Based Food Production

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