Effect of nitrogen levels and harvest timing on growth, yield and quality of lettuce under floating hydroponic system

Thapa, U.; Nandi, Suman; Rai, Rashmi; Upadhyay, Anamika

doi:10.1080/01904167.2022.2064299

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…In addition, the nitrate content can be manipulated to a certain degree through the nutrient solution and be kept under certain thresholds [ 51 , 52 , 53 , 54 , 55 , 56 ]. Depending on the available technology of the greenhouse, the nitrate content can be further controlled through supplemental lighting [ 57 , 58 , 59 , 60 , 61 ], but other parameters such as the growing period, temperatures, and time of harvest should also be taken into account since they affect the nitrate accumulation in leaf tissues [ 62 , 63 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of NaCl and CaCl2 as Eustress Factors on Growth, Yield, and Mineral Composition of Hydroponically Grown Valerianella locusta

Karavidas

Petropoulos

Zioviris

et al. 2023

Plants

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Corn salad (Valerianella locusta) is a popular winter salad, cultivated as an ingredient for ready-to-eat salads. The application of mild salinity stress (eustress) can increase the flavor and reduce the nitrate content of certain crops but, at the same time, a wrong choice of the eustress type and dose can negatively affect the overall productivity. In this research, the effects of different isosmotic salt solutions, corresponding to two different electrical conductivity (EC) levels, were investigated on the yield and mineral composition of hydroponically grown Valerianella locusta “Elixir”. Five nutrient solutions (NS) were compared, including a basic NS used as the control, and four saline NS were obtained by adding to the basic NS either NaCl or CaCl2 at two rates each, corresponding to two isosmotic salt levels at a low and high EC level. Corn salad proved moderately susceptible to long-term salinity stress, suffering growth losses at both low and high EC levels of saline solution, except from the low NaCl treatment. Hence, it appears that mild salinity stress induced by NaCl could be employed as an eustress solution and corn salad could be cultivated with low-quality irrigation water (20 mM NaCl) in hydroponic systems.

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Section: Introductionmentioning

confidence: 99%

Effects of NaCl and CaCl2 as Eustress Factors on Growth, Yield, and Mineral Composition of Hydroponically Grown Valerianella locusta

Karavidas

Petropoulos

Zioviris

et al. 2023

Plants

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show abstract

“…Contrary to our results, a recent study demonstrated that the number of leaves and yield were signi cantly higher in lettuces grown in DWC than in NFT and soil-based cultivation in two different crop cycles cultivated under different growing seasons 39 . Differences in terms of the number of leaves per plant may be associated with the nutrient solution composition, especially N and its uptake by plants [40][41][42] . However, there was no signi cant difference in N uptake among hydroponic cultivation systems.…”

Section: Discussionmentioning

confidence: 99%

Assessing different hydroponic subsystems for Batavia lettuce growth under different planting density treatments

ÇEKİN>

El-Gabry²,

Lothmann

et al. 2023

Preprint

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Hydroponic systems have the potential for being one of the most promising sustainable alternative methods of food production, where they confer the advantages of producing higher yields with better control over plant growth. The main purpose of this study is to determine differences in growth rates, sensory attributes and nutrient uptake upon growing lettuce (Lactuca sativa L.) in various hydroponic subsystems at two different plant spacings. We investigated the interaction of different effects on lettuce growth in four hydroponic subsystems, Deep Water Culture ((DWC), Nutrient Film Technique (NFT), Media- Bed system (MB) and Sandponic (SP), at two different plant densities, at narrow planting spacings (20 x25 cm), and larger planting spacings (24 x 25 cm). Our findings show that cultivation methods and planting spacing greatly influence lettuce growth. Overall, the present study provides direct evidence that DWC and NFTs subsystems at both planting spacings performed the best in terms of giving higher yield production, higher plant growth parameters, and better sensory attributes compared to other cultivation systems. Lettuces grown in the DWC system had higher chlorophyll B (29.13 ± 0.82 mg/100 g), and carotene content (32.40 ± 1.27 mg/100 g) in narrow planting spacing and were the most preferred lettuces according to taste tests (52.4%).

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“…Nitrogen fertilizers both accelerate and delay the bolting of lettuce (Boroujerdnia and Ansari, 2007). Higher N levels positively affect the growth, yield, and quality of lettuce (Thapa et al, 2022). The NH 4 + :NO 3 ratio affects the plug seedlings of horticultural crops (Lim and Jeong, 2001;Park et al, 2021) and lettuce cultivation (Noh and Jeong, 2023).…”

Section: Introductionmentioning

confidence: 99%

Application of a Polyphosphate Fertilizer Treatment Enhances the Growth Rate of Lettuce Seedlings in a Commercial Plant Factory

Lyu,

Hwang,

Jeong

et al. 2024

HST

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Several commercial plant factories cultivate lettuce, and the crop growth rate is an important factor related to profitability. The early development of lettuce is affected by phosphorus uptake, and plants absorb polyphosphates more stably than they do monophosphates. This study was conducted to evaluate the growth rate of lettuce (Lactuca sativa L. 'Caipira') during a polyphosphate treatment. Phosphorus was used in various combinations with potassium monophosphate (KH 2 PO 4 ) and potassium polyphosphate (K 5 P 3 O 10 ), specifically 32.4 + 15 (M2P1), 16.6 + 29.9 (M1P2), and 0.1 + 44.9 (M0P3) mg•L -1 , and 48 mg•L -1 KH 2 PO 4 as the control. The leaf length, leaf width, leaf area, and fresh and dry weights increased significantly with high polyphosphate concentrations (M0P3). The growth rate of the roots, the total root length, the root surface area, and the number of root tips were significantly increased in M0P3. Leaf growth was significantly different in the later stages of lettuce growth, whereas root growth was significantly different in the early stages. The results of this study suggest that the growth rate of lettuce can be improved by increasing the polyphosphate concentration, which could positively affect the profitability of commercial plant factories.

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Effect of nitrogen levels and harvest timing on growth, yield and quality of lettuce under floating hydroponic system

Cited by 15 publications

References 32 publications

Effects of NaCl and CaCl2 as Eustress Factors on Growth, Yield, and Mineral Composition of Hydroponically Grown Valerianella locusta

Effects of NaCl and CaCl2 as Eustress Factors on Growth, Yield, and Mineral Composition of Hydroponically Grown Valerianella locusta

Assessing different hydroponic subsystems for Batavia lettuce growth under different planting density treatments

Application of a Polyphosphate Fertilizer Treatment Enhances the Growth Rate of Lettuce Seedlings in a Commercial Plant Factory

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