Effects of Supplementary Stroboscope and UV Lighting and Addition of Coral Sand to Nutrient Solution on Lettuce Yield and Quality.

Ammonium (NH4+) to nitrate (NO3-) ratio and growth media significantly alter plant development and NO3- accumulation in lettuce. Nitrate accumulation is regarded harmful for environment and human health. The quality of lettuce is assessed by NO3-concentration, size, and weight. This study determined the impact of five different growth media (cocopeat, peat, bark, perlite and rockwool) and four different NH4+:NO3- ratios (0:100, 20:80, 40:60 and 60:40) on NO3- accumulation in lettuce, yield, and several growth attributes. The experimentation was conducted according to open feeding system of soilless agriculture. The ‘Cosmos’ variety of lettuce was used as experimental material in the study. Growth mediums and NH4+:NO3- ratios significantly altered NO3- accumulation, head, leaf, stem and root traits. The results revealed that instead of growing lettuce with NO3- only in peat and rockwool, addition of NH4+ (20:80 of NH4+:NO3-) into nutrient solution increased head weight. While head weight increased in perlite medium with the addition of NH4+, it decreased in cocopeat and bark media. It is concluded that growth media and NH4+:NO3- ratios pose significant impacts on NO3- accumulation in leaf and that the increase in NH4+ ratio decreased NO3- accumulation in all growing media. Therefore, it is recommended that NH4+ should be added in the nutrient solution to decrease NO3- accumulation, which will ultimately improve yield and quality of lettuce.

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The Effect of Environment and Nutrients on Hydroponic Lettuce Yield, Quality, and Phytonutrients

Horticulturae ◽

10.3390/horticulturae4040048 ◽

2018 ◽

Vol 4 (4) ◽

pp. 48 ◽

Cited By ~ 10

Author(s):

William Sublett ◽

T. Barickman ◽

Carl Sams

Keyword(s):

Nutrient Solution ◽

Growing Season ◽

Nutrient Concentrations ◽

Eastern United States ◽

Marketable Yield ◽

Greenhouse Production ◽

Growing Seasons ◽

Yield And Quality ◽

Lettuce Yield ◽

Leaf Lettuce

A study was conducted with green and red-leaf lettuce cultivars grown in a deep-water culture production system. Plants were seeded in rockwool and germinated under greenhouse conditions at 25/20 °C (day/night) for 21 days before transplanting. The experimental design was a randomized complete block with a 2 × 3 factorial arrangement of cultivar and nutrient treatments that consisted of six replications. Treatments consisted of two lettuce genotypes, (1) green (Winter Density) and (2) red (Rhazes), and three nutrient treatments containing electroconductivity (EC) levels of (1) 1.0; (2) 2.0; and (3) 4.0 mS·cm−1. After 50 days, plants were harvested, processed, and analyzed to determine marketable yield, biomass, plant height, stem diameter, phenolics, and elemental nutrient concentrations. An interaction between growing season and lettuce cultivar was the predominant factor influencing yield, biomass, and quality. Nutrient solution EC treatment significantly affected biomass and water content. EC treatments significantly impacted concentrations of 3-O-glucoside and uptake of phosphorous, potassium, iron, boron, zinc, and molybdenum. Effects of growing season and cultivar on leafy lettuce yield and quality were more pronounced than the effect of nutrient solution EC treatment. Thus, greenhouse production of green and red-leaf lettuce cultivars in the south-eastern United States should be conducted in the spring and fall growing seasons with elevated nutrient solution EC of ≈4.0 mS·cm−1 to maximize yield and quality.

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Yield and quality of 'gália' melon grown in coconut fiber under different concentrations of macronutrients in the nutrient solution

Idesia (Arica) ◽

10.4067/s0718-34292017000400119 ◽

2017 ◽

Vol 35 (4) ◽

pp. 119-128 ◽

Cited By ~ 1

Author(s):

Christiano Rebougas Cosme ◽

Nildo da Silva Dias ◽

Karen Mariany Pereira Silva ◽

Camilo Vinícius Trindade Silva ◽

Ítalo Sorac Rafael de Queiroz ◽

...

Keyword(s):

Nutrient Solution ◽

Coconut Fiber ◽

Yield And Quality

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Nutrient solution concentration and growing season affect yield and quality of Lactuca sativa L. var. acephala in floating raft culture

Journal of the Science of Food and Agriculture ◽

10.1002/jsfa.3641 ◽

2009 ◽

Vol 89 (10) ◽

pp. 1682-1689 ◽

Cited By ~ 86

Author(s):

Carlo Fallovo ◽

Youssef Rouphael ◽

Elvira Rea ◽

Alberto Battistelli ◽

Giuseppe Colla

Keyword(s):

Nutrient Solution ◽

Lactuca Sativa ◽

Growing Season ◽

Solution Concentration ◽

Raft Culture ◽

Floating Raft ◽

Yield And Quality ◽

Lactuca Sativa L

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Effect of Fertigation Management and the Composition of Nutrient Solution on the Yield and Quality of High Soluble Solid Content Tomatoes

Journal of the Japanese Society for Horticultural Science ◽

10.2503/jjshs1.77.143 ◽

2008 ◽

Vol 77 (2) ◽

pp. 143-149 ◽

Cited By ~ 3

Author(s):

Shahnaz Sarkar ◽

Yoshikazu Kiriiwa ◽

Masanobu Endo ◽

Tomoya Kobayashi ◽

Akira Nukaya

Keyword(s):

Nutrient Solution ◽

Solid Content ◽

Soluble Solid Content ◽

Yield And Quality ◽

Soluble Solid

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Farklı Besin Solüsyonlarının Yüzen Su Kültüründe Rokanın Verim ve Kalite Özelliklerine Etkileri

Turkish Journal of Agriculture - Food Science and Technology ◽

10.24925/turjaf.v7i2.258-265.2238 ◽

2019 ◽

Vol 7 (2) ◽

pp. 258

Author(s):

Golgen Bahar Oztekin ◽

Tuğba Uludağ ◽

Yüksel Tüzel ◽

Mahmut Tepecik

Keyword(s):

Plant Growth ◽

Vitamin C ◽

Nutrient Solution ◽

Growth Yield ◽

Nitrate Content ◽

Water Culture ◽

Full Dose ◽

Macro Elements ◽

Yield And Quality ◽

Half Dose

This study was conducted in styrofoam trays placed on an aerated nutrient solution in vats in order to determine the effect of different nutrient solutions on rocket plant growth, yield and quality. Seeds of Bengi F1 rocket cultivar were sown into peat as inserting each seed to each hole (17 ccs) of trays with 210 cells (957 plant m-2). Following germination in the germination chamber, seedling trays were moved to a climate controlled greenhouse for adaptation. After emergence, the seedlings were transferred to water culture. The nutrient solution was applied as “full dose” (mg/L: N 150, P 50, K 150, Ca 150, Mg 50, Fe 5.0, Mn 0.50, Zn 0.05, B 0.50, Cu 0.03, Mo 0.02), “half dose” (macro elements reduced by 50%) and “without nutrients” (water). Cultivation was performed in 2 consecutive periods and in each period 3 harvests were done and quality analysis was done on the leaves from the first harvest. Results were given as the mean of two periods. Results showed that plant growth, yield and quality parameters vary depending on the concentration of the nutrient solution. It was observed that as the concentration of nutrient solution decreased, plant growth, biomass, yield values decreased, leaf color and total chlorophyll concentration did not change and while nitrate content decreased, vitamin C content increased. Leaf N, P, K and Fe element contents decreased with half dose, whereas Ca and Mg content did not change. However, there was no statistical difference between full dose and half dose treatments in many measured parameters. When all the data obtained from the study are evaluated together; it is suggested that rocket can be grown in a floating water culture and the dose of macro elements as reduced 50% can be preferred because it reduces the nitrate content, increases the vitamin C content and allows the use of less fertilizers without causing any significant reduction in yield compared with full dose.

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Lettuce Yield and Quality When Grown in High Tunnel and Open-Field Production Systems Under Three Diverse Climates

HortTechnology ◽

10.21273/horttech.22.5.659 ◽

2012 ◽

Vol 22 (5) ◽

pp. 659-668 ◽

Cited By ~ 12

Author(s):

Russell W. Wallace ◽

Annette L. Wszelaki ◽

Carol A. Miles ◽

Jeremy S. Cowan ◽

Jeffrey Martin ◽

...

Keyword(s):

Open Field ◽

Production Systems ◽

Organic Production ◽

High Tunnel ◽

Mount Vernon ◽

Yield And Quality ◽

High Tunnels ◽

Lettuce Yield ◽

Field Plots ◽

Field Production

Field studies were conducted during 2010 and 2011 in Knoxville, TN; Lubbock, TX; and Mount Vernon, WA; to compare high tunnel and open-field organic production systems for season extension and adverse climate protection on lettuce (Lactuca sativa) yield and quality. The climates of these locations are diverse and can be typified as hot and humid (Knoxville), hot and dry (Lubbock), and cool and humid (Mount Vernon). In both years, 6-week-old lettuce seedlings of ‘New Red Fire’ and ‘Green Star’ (leafy type), ‘Adriana’ and ‘Ermosa’ (butterhead type), and ‘Coastal Star’ and ‘Jericho’ (romaine type) were transplanted in the late winter or early spring into subplots covered with black plastic and grown to maturity (43 to 65 days). Lettuce harvest in Knoxville occurred at 50 to 62 days after transplanting (DAT), with open-field lettuce harvested an average of 9 days earlier compared with high tunnel plots both years (P > 0.0001). The earlier than anticipated harvests in the open-field in Knoxville in 2010 were due to lettuce bolting. In Lubbock, high tunnel lettuce was harvested an average 16 days earlier in 2010 compared with open-field lettuce (P > 0.0001), while in 2011, high temperatures and bolting required that open-field lettuce be harvested 4 days earlier than lettuce grown in high tunnels. On average, lettuce cultivars at Mount Vernon matured and were harvested 56 to 61 DAT in 2010 and 54 to 64 DAT in 2011 with no significant differences between high tunnel and open-field production systems. Total and marketable yields at Mount Vernon and Lubbock averaged across cultivars were comparable in both high tunnel and open-field plots. At Knoxville, although total yields were significantly higher (P > 0.0062) in high tunnels than open-field plots, incidence of insect, disease, and physiological damage in high tunnel plots reduced lettuce quality and marketable yield (P > 0.0002). Lettuce head length:diameter ratio (LDR) averaged across cultivars was equal between high tunnel and the open field at all three locations. High tunnel production systems offer greater control of environments suitable for lettuce production, especially in climates like Knoxville and Lubbock where later-planted open-field systems may be more susceptible to temperature swings that may affect lettuce quality. These results suggest that although high tunnel culture alone may influence lettuce yield and quality, regional climates likely play a critical role in determining the impact of these two production systems on marketable lettuce yields.

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