Lettuce (<i>Lactuca sativa</i>L.) growth, yield and quality response to nitrogen fertilization in a non-circulating hydroponic system

Mahlangu, Rebecca Irene Sindisiwe; Maboko, Martin Makgose; Sivakumar, Dharini; Soundy, Puffy; Jifon, John

doi:10.1080/01904167.2016.1187739

Cited by 49 publications

(43 citation statements)

References 30 publications

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“…In addition, the cubic effect was observed because yield began to decrease when N concentration increased from 150 to 200 mg · L -1 but increased again with increasing N concentration from 300 to 400 mg · L -1 . These results are consistent with earlier findings for lettuce in a hydroponic system (Fallovo et al, 2009;Mahlangu et al, 2016) and in field condition (Di Gioia et al, 2017). With wider ranges of nutrient solution N concentration (40-2400 mg · L -1 ), Stefanelli et al (2011) observed increase in oak leaf yield grown with perlite substrate to a maximum level at 400 mg · L -1 but there was no statistical difference in yield between N rates at 400 mg · L -1 and the commercial standard rate (1000-1200 mg · L -1 ) used in the region (Australia).…”

Section: Discussionsupporting

confidence: 93%

“…Because a continuous supply of N in the nutrient solution is a prerequisite for normal growth, the ensuing critical question is as follows: what is the optimum N concentration to use in the nutrient solution to ensure maximum growth and yield? The current literature reports a wide range of N concentration for maximum growth and yield in hydroponic lettuce production systems (Fallovo et al, 2009;Mahlangu et al, 2016;Resh, 2012;Stefanelli et al, 2011). Gent (2014) reported that concentrations of nitrate in standard nutrient solutions for hydroponics range from 100 to 200 mg · L -1 .…”

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confidence: 99%

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Seasonal Changes in Growth, Nitrogen Nutrition, and Yield of Hydroponic Lettuce

Djidonou¹,

Leskovar²

2019

horts

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The effect of different nitrogen (N) concentrations on growth changes, leaf N concentration and accumulation patterns, N nutrition index (NNI), fresh weight yield, and N use efficiency (NUE) was determined for lettuce grown over three consecutive seasons (fall, winter, and spring) in a recirculating hydroponic system, under unheated and naturally lit hoop house in Uvalde, TX. The lettuce cultivars Buttercrunch, Dragoon, and Sparx were grown at six N concentrations, initially 100, 150, 200, 250, 300, and 400 mg · L L1 using a nutrient film technique (NFT). Leaf number, accumulated dry weight (DW) and N, and leaf area index (LAI) followed a logistic trend over time, characterized by a slow increase during early growth followed by a linear increase to a maximum. By contrast, plant total N concentrations were the highest at early stage and decreased slightly over time. Effect of season and cultivar on these growth traits was more pronounced than that of the N concentrations. Averaged across cultivar and N concentrations, DW in spring was 73% and 34% greater than that in fall and winter, respectively. At each sampling date, there were linear, quadratic, or cubic effects of N concentrations on each of these variables. The cultivar Sparx was the most productive, with 63% and 32% higher fresh weight yield in fall, 145% and 114% in spring, than 'Buttercrunch' and 'Dragoon', respectively. Increasing nutrient solution N concentrations from 100 to 400 mg · L L1 increased the yield from 5.9 to 6.7 kg · m L2 in fall, 8.1 to 10.7 kg · m L2 in winter, and 10.3 to 12.6 kg · m L2 in spring. The NUE was the highest at the lowest N concentration (100 mg · L L1 ) and decreased with increasing N concentrations. The NNI during mid-to late-growth stages was near or greater than one, even at the lowest N. These results demonstrated that N concentrations of 100-150 mg · L L1 maximized the growth and yield of hydroponically grown lettuce.

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Section: Discussionsupporting

confidence: 93%

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confidence: 99%

Seasonal Changes in Growth, Nitrogen Nutrition, and Yield of Hydroponic Lettuce

Djidonou¹,

Leskovar²

2019

horts

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“…In other plant species, high correlation between the two variables was demonstrated, as in oregano (r= 0.64) (Medellí n et al, 2016) and kaki (r= 0.97) (Choi et al, 2011). In general, these studies proved that SPAD has strong correlations with the N content in the leaf, which correlated with increased photosynthesis and productivity, as observed by Mahlangu et al (2016). This reaffirms the efficiency of the SPAD chlorophyll meter for diagnosing the N level in jambu plants, as well as for predicting yield, as observed by Milagres et al (2018) in potato cultivation.…”

Section: Correlation Of Thementioning

confidence: 76%

“…The N are related to various plant physiological process, acting in significant manner at the photosynthesis, respiration, ionic absorption and other process related to growing and development vegetal (Mahlangu et al, 2016;Marschner, 2012;Taiz et al, 2017). In general, vegetables have large necessity of N due to your short cycle, as demonstrated in lettuce studies, jambu same family specie (Mahlangu et al, 2016).…”

Section: Leaf Dry Massmentioning

confidence: 99%

Evaluation of the Non-destructive Method Efficiency of Estimating Nitrogen Content in Jambu Plants Grown in Hydroponic System

Sampaio

Júnior²,

Chagas³

et al. 2020

JAS

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Jambu is considered a leafy vegetable with expressive relevance in the regions that compose the Brazilian Amazon. However, there are challenges regarding its cultivation, particularly for the nutritional management, since there is little technical information that allows an increase in the efficiency of its production. In this sense, nitrogen (N) gains prominence, since it is related to the increased yield and quality of leafy vegetables, therefore its monitoring of N content in plants is necessary. The objective of this study was to evaluate the efficiency of using the SPAD index to estimate the N content of jambu leaves, total chlorophyll concentration, as well as its relationship with dry mass accumulation due to the increase of nitrogen concentration in the nutrient solution. The design used was completely randomized with eight replications. The treatments were six nitrogen concentrations in the nutrient solution (11, 13, 15, 17, 19 and 21 mmol L -¹ ). After 21 days of transplantation, the SPAD index was measured. Then, these plants were collected to quantify the total chlorophyll, dry mass and nitrogen content. In general, the variables were explained by increasing linear models. There was a positive correlation between the SPAD index and the other characteristics evaluated. Based on the results, the best response at the concentration of 21 mmol L -¹ in the nutrient solution stands out. In addition, the SPAD index has potential to be used in the diagnosis of nitrogen status in jambu leaves.

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“…Lettuce leaves were oven dried at 70°C for 48 hr and thereafter ground and sieved to quantify the leaf N, P, K, Ca, Mg, Zn, and Fe content using the ICP OES (inductively coupled plasma optical emission spectrometry) according to Mahlangu, Maboko, Sivakumar, Soundy, and Jifon (2016).…”

Section: Mineral Analysismentioning

confidence: 99%

Impact of transportation, storage, and retail shelf conditions on lettuce quality and phytonutrients losses in the supply chain

Managa

Tinyani

Senyolo

et al. 2018

Food Science & Nutrition

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This study was initiated to investigate the impact of transportation, storage, and retail shelf conditions on lettuce quality and phytonutrients losses in the urban fresh produce market supply chain. Reducing postharvest losses is a priority to reduce the loss of the dietary‐based phytonutrients and to improve the health of the consumers. Limited information is available in South Africa related to the postharvest and nutrition loss in the urban fresh produce market supply chain. In this study, we quantified the postharvest losses, changes in phytochemicals, and loss of minerals in lettuce at different points of Tshwane Fresh Produce Market supply chain. Lettuce supply to the Tshwane Fresh Produce Market from two different provinces, Gauteng and North West, were included in this study for comparison. Lettuce from the two provinces was collected from five different farms. The loss of fresh weight, changes in visual quality, phytonutrition properties, and economic loss of lettuce at the supply chain points: (a) transport; (b) storage; (c) and at the retail shelf was investigated. Five boxes of lettuce per supply chain point from Gauteng and North West provinces were randomly selected. The results indicated that the high temperature (25°C) and low RH (40%) at the retail shelf affected the weight, overall quality, and phytonutrition properties of lettuce. Cumulative economic loss was higher at the retail shelf due to the inferior quality of lettuce. The study identified where major quality and phytonutrition losses occur during marketing. The study demonstrated to identify the where major food and nutritional loss losses occur during marketing. This information will significantly benefit food sustainability by introducing technologies to manage food and nutrition losses.

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Lettuce (Lactuca sativaL.) growth, yield and quality response to nitrogen fertilization in a non-circulating hydroponic system

Cited by 49 publications

References 30 publications

Seasonal Changes in Growth, Nitrogen Nutrition, and Yield of Hydroponic Lettuce

Seasonal Changes in Growth, Nitrogen Nutrition, and Yield of Hydroponic Lettuce

Evaluation of the Non-destructive Method Efficiency of Estimating Nitrogen Content in Jambu Plants Grown in Hydroponic System

Impact of transportation, storage, and retail shelf conditions on lettuce quality and phytonutrients losses in the supply chain

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