The effect of plant mulching and covering on the lettuce yield and nitrate content (Lactuca sativa L.)

2014 ◽  
Vol 9 (23) ◽  
pp. 1774-1777 ◽  
Author(s):  
Toić Ivana ◽  
Ilin Žarko ◽  
Maksimović Ivana ◽  
Pavlović Slobodanka
Keyword(s):  
Lactuca Sativa ◽  
Nitrate Content ◽  
Lactuca Sativa L ◽  
Lettuce Yield

scholarly journals EC Sensitivity of Hydroponically-Grown Lettuce (Lactuca sativa L.) Types in Terms of Nitrate Accumulation

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 315
Author(s):  
Noémi Kappel ◽  
Ildikó Fruzsina Boros ◽  
Francia Seconde Ravelombola ◽  
László Sipos
Keyword(s):  
Lactuca Sativa ◽  
Nitrate Content ◽  
Saline Condition ◽  
Fresh Weight ◽  
Nitrate Level ◽  
Nitrate Accumulation ◽  
Strong Negative Correlation ◽  
Lactuca Sativa L ◽  
Hydroponically Grown ◽  
European Markets

The goal of this research was to investigate the effect of electrical conductivity (EC) levels of the nutrient solution on the fresh weight, chlorophyll, and nitrate content of hydroponic-system-grown lettuce. The selected cultivars are the most representative commercial varieties grown for European markets. Seven cultivars (‘Sintia,’ ‘Limeira,’ ‘Corentine,’ ‘Cencibel,’ ‘Kiber,’ ‘Attiraï,’ and ‘Rouxaï’) of three Lactuca sativa L. types’ (butterhead, loose leaf, and oak leaf) were grown in a phytotron in rockwool, meanwhile the EC level of the nutrient solutions were different: normal (<1.3 dS/m) and high (10 dS/m). The plants in the saline condition had a lower yield but elevated chlorophyll content and nitrate level, although the ‘Limeira’ and ‘Cencibel’ cultivars had reduced nitrate levels. The results and the special characteristic of the lollo-type cultivars showed that the nitrate level could be very different due to salinity (‘Limeira’ had the lowest (684 µg/g fresh weight (FW)) and ‘Cencibel’ had the highest (4396 µg/g FW)). There was a moderately strong negative correlation (−0.542) in the reverse ratio among the chlorophyll and nitrate contents in plants treated with a normal EC value, while this relationship was not shown in the saline condition. Under the saline condition, cultivars acted differently, and all examined cultivars stayed under the permitted total nitrate level (5000 µg/g FW).

The inheritance of nitrate content in lettuce (Lactuca sativa L.)

Euphytica ◽  
1987 ◽  
Vol 36 (3) ◽  
pp. 733-744 ◽  
Author(s):  
K. Reinink ◽  
R. Groenwold
Keyword(s):  
Lactuca Sativa ◽  
Nitrate Content ◽  
Lactuca Sativa L

scholarly journals PRODUÇÃO DE ALFACE SOB DIFERENTES NÍVEIS DE SALINIDADE DO SOLO

Irriga ◽  
2005 ◽  
Vol 10 (1) ◽  
pp. 20-29 ◽  
Author(s):  
Nildo Da Silva Dias ◽  
Sergio Nascimento Duarte ◽  
Roberto Takafumi Yoshinaga ◽  
José Francisco Teles Filho
Keyword(s):  
Soil Salinity ◽  
Lactuca Sativa ◽  
Soil Depth ◽  
Fertilizer Application ◽  
Retention Capacity ◽  
Lactuca Sativa L ◽  
Engineering Department ◽  
Lettuce Yield ◽  
The One ◽  
Different Levels

PRODUÇÃO DE ALFACE SOB DIFERENTES NÍVEIS DE SALINIDADE DO SOLO. Nildo da Silva Dias; Sergio Nascimento Duarte; Roberto Takafumi Yoshinaga; José Francisco Teles FilhoDepartamento de Engenharia Rural, Escola Superior de Agricultura ”Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, SP., CP 09, CEP 13418-900,  [email protected] 1 RESUMODevido à falta de conhecimento por parte dos nossos agricultores e técnicos a respeito do manejo adequado da fertirrigação, tem sido freqüente os problemas de salinização de solo, sobretudo em ambiente protegido. Desse modo, com o objetivo estudar os efeitos de diferentes níveis iniciais de salinidade do solo no crescimento e na produção de alface, foi desenvolvido um experimento em ambiente protegido no Departamento de Engenharia Rural da Escola Superior de Agricultura “Luiz de Queiroz”, município de Piracicaba, SP. Utilizaram-se amostras de 10 kg de solo de um Latossolo Vermelho, as quais foram peneiradas, secas ao ar e acondicionadas em vasos de 17 L, tendo em sua base perfurada uma camada de envelope de 2 cm (brita + geotextil), resultando em uma camada de solo de 20 cm. As amostras de solos foram salinizadas artificialmente por excesso de adubos utilizados na fertirrigação. A umidade do solo foi elevada até a máxima capacidade de retenção e, concomitantemente, foram adicionados os sais diluídos via água, obtendo-se 9 níveis diferentes de salinidade do solo (0,4; 1,0, 2,0; 3,0; 4,0; 5,0; 6,0; 7,0 e 8,0 dS m -1) com 5 repetições. As proporções e os tipos de sais aplicados no solo seguiram a recomendação de adubação para a cultura do alface. Determinou-se o limite máximo de salinidade (salinidade limiar) tolerado pela cultura, causada pelo excesso de fertilizantes e seus efeitos nas variáveis de produção comercial e nos componentes de produção. Concluiu-se que todas as variáveis analisadas foram influenciadas pelos níveis iniciais de salinidade, e que para a maioria delas, o nível limiar foi superior ao usualmente citado na literatura (1,3 dS m-1). UNITERMOS: condutividade elétrica, fertirrigação, Lactuca sativa L.  DIAS, N. S.; DUARTE, S. N.; YOSHINAGA, R. T.; TELES FILHO, J. F.LETTUCE YIELD UNDER DIFFERENT LEVELS OF SOIL SALINITY.                                                                                                                  2 ABSTRACT Due to the lack of knowledge of the appropriate fertirrigation management in greenhouses by our farmers and technicians, problems of soil salinity have been observed frequently. To evaluate lettuce yield and growth under different levels of soil salinity caused by excessive fertilizer application, a study under greenhouse conditions was carried out in the experimental field of the Rural Engineering Department of the “Escola Superior de Agricultura Luiz de Queiroz – USP”, Piracicaba, Brazil. 10-kg soil samples in Oxysol were used. They were sifted, dried in open air and conditioned in 17-L perforated base vases with a 2-cm envelope layer (gravel + synthetic fabric), resulting in a 20-cm soil depth. The soils samples were salinized artificially by excess of fertilizers used in fertirrigation. The soil moisture was elevated to the maximum retention capacity using water with diluted salts to obtain 9 different levels of soil salinity (0.4, 1.0, 2.0, 3.0,4.0, 5.0, 6.0, 7.0 and 8.0 dS m -1) with 5 repetitions. The proportions and types of salts applied in the soil followed the total nutrient extraction for the culture of lettuce (Lactuca sativa L.). The maximum tolerated salinity limit caused by fertilizer excess was determined and also its effects in commercial production and production components. The results showed that different levels of soil salinity influenced all analyzed variables and that for most of the variables the maximum limit was higher than the one used found in the literature (1,3 dS m-1). KEYWORDS: Electric conductivity, fertirrigation, Lactuca sativa L.

scholarly journals Yield and nutritional quality of greenhouse lettuce (Lactuca sativa L.) as affected by genotype and production methods

Genetika ◽  
2014 ◽  
Vol 46 (3) ◽  
pp. 1027-1036 ◽  
Author(s):  
Aleksandra Govedarica-Lucic ◽  
Mirjana Mojevic ◽  
Goran Perkovic ◽  
Branka Govedarica
Keyword(s):  
Lactuca Sativa ◽  
Nutritional Quality ◽  
Bare Soil ◽  
Production Method ◽  
Nitrate Content ◽  
The European Union ◽  
Production Methods ◽  
Lactuca Sativa L ◽  
Control Variant

Greenhouse experiments were conducted in winter growing seasons in order to evaluate the effects of genotype and production methods on yield and nutritional quality of lettuce (Lactuca sativa L.). A three-year (2009-2011) study was conducted by randomized block system in a greenhouse without additional heating. The trial included three genotypes of lettuce (Archimedes RZ, Santoro RZ, Kibou RZ). Each row with these genotypes was exposed to the following variants of covering: control-planting on bare soil, mulching before sowing with PE-black foil, agro textile-covering plants after planting with agro textile (17 g), a combination of mulching + agro textile. Throughout of all the three years of the trial, it was continuously evidenced that the genotype ?Santoro RZ? had the biggest heads and the highest yield (15.33 kg 10 m-2), which leads to conclusion that the yield of lettuce is a genotype characteristics. Moreover, the nutritional value (ascorbic acid concentration) has shown that, depending on the method of production, in average, the combination of mulching + agro textile (26.77 mg 100 g-1) had the highest content while the control variant had significantly lower vitamin C content (21.10 mg 100 g-1). The three-year researches have shown that the production method and genotype significantly affect the nitrate content. An average nitrate content was 2196.33 mg kg-1 on the control variant, and 2526.24 mg kg-1 on agro textile. Leafy lettuce of genotyp ?Kibou RZ? had lower nitrate content (2176.85 mg kg-1) compared to ?Archimedes RZ? (2843.05 mg kg-1) and ?Santoro RZ? (2221.37 mg kg-1). However nitrate concentration in all treatments remained within the European Union?s permissible levels.

scholarly journals The Effect of Light-dependent Application of Nitrate on the Growth of Aeroponically Grown Lettuce (Lactuca sativa L.)

2004 ◽  
Vol 129 (4) ◽  
pp. 570-575 ◽  
Author(s):  
Jernej Demšar ◽  
Jože Osvald ◽  
Dominik Vodnik
Keyword(s):  
Lactuca Sativa ◽  
Early Spring ◽  
Nitrate Content ◽  
Light Conditions ◽  
Nitrate Accumulation ◽  
Low Light ◽  
Efficient Reduction ◽  
Nitrate Supply ◽  
Lettuce Yield ◽  
Leaf Nitrate

With a high nitrate supply, and most frequently under low-light conditions, lettuce accumulates relatively large amounts of NO3-as a result of an excess of uptake over reduction. Different approaches, which are used to reduce leaf nitrate, often result in a yield loss. A computerized aeroponic system, which supplies different nitrate concentrations in accordance with the changeable light conditions (dynamic light-dependent application of nitrate), was used to reduce nitrate accumulation in lettuce (Lactuca sativa L.) var. Capitata cv. Vanity. Under unfavorable light conditions nitrate was supplied at limited rates (slight, medium, and strong reduction) to the plants. In response to given light conditions the nitrate supply was reduced close to one-half or one-fourth of the full nutrient solution (8 mmol·L-1 NO3-). Controlled nutrition resulted in efficient reduction in leaf nitrate. In the early-spring experiment the average nitrate content in outer leaves was decreased by 9%, 63%, and 92% and in the late-spring experiment the decrease was 23%, 58%, and 76% compared to control. At the same time, the controlled, light-dependent nitrate deprivation did not result in a loss of a lettuce yield (except in the treatment with strong nitrate reduction) and had limited effects on photosynthesis (PN-Ci measurements) and photosynthetic pigments.

scholarly journals COMPORTAMENTO DA ALFACE-AMERICANA SOB DIFERENTES DOSES DE COMPOSTO ORGÂNICO E LÂMINAS DE IRRIGAÇÃO(I)

Irriga ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Kenya Gonçalves Nunes ◽  
Raimundo Nonato Távora Costa ◽  
José Aglodualdo Holanda Cavalcante Júnior ◽  
Danielle Ferreira de Araújo
Keyword(s):  
Lactuca Sativa ◽  
Water Productivity ◽  
Maximum Yield ◽  
Production Factor ◽  
Quadratic Model ◽  
Production Factors ◽  
Lactuca Sativa L ◽  
Lettuce Yield ◽  
Irrigation Levels ◽  
Different Levels

COMPORTAMENTO DA ALFACE-AMERICANA SOB DIFERENTES DOSES DE COMPOSTO ORGÂNICO E LÂMINAS DE IRRIGAÇÃO(I)  KENYA GONÇALVES NUNES1; RAIMUNDO NONATO TÁVORA COSTA1; JOSÉ AGLODUALDO HOLANDA CAVALCANTE JÚNIOR2 E DANIELLE FERREIRA DE ARAÚJO3 (I)Parte da dissertação de mestrado do primeiro autor.1Universidade Federal do Ceará, Departamento de Engenharia Agrícola, Fortaleza-CE, [email protected], [email protected] Federal de Educação do Ceará, Crateús-CE, [email protected] de Fortaleza, Fortaleza-CE, [email protected]  1 RESUMO A alface é uma das hortaliças mais cultivadas em várias regiões brasileiras e com a crescente demanda de produtos orgânicos pelos consumidores, vários produtores decidiram migrar para o método ecológico de cultivo. O estudo teve como objetivo avaliar a capacidade produtiva da alface sob diferentes tratamentos de lâminas de irrigação e doses de composto orgânico. Utilizaram-se cinco lâminas de irrigação e quatro doses de composto orgânico em um delineamento experimental em blocos inteiramente casualizados, no esquema de parcelas subdivididas e quatro repetições. Os resultados permitiram concluir que: a aplicação dos fatores de produção água e composto orgânico elevaram os níveis médios de produtividade da alface em até 38,3%; a produtividade máxima estimada pode ser obtida com dose 6,3 kg m-2 de composto orgânico; o decréscimo inferior a 6% no nível de produtividade média da alface ao se reduzir em 50% a lâmina de irrigação aplicada demonstra que este fator de produção, além de não ter sido limitante, possibilita o uso da estratégia de irrigação com déficit; os valores médios de produtividade da água incrementaram com o aumento das doses de composto orgânico segundo um modelo quadrático. Palavras-chave: Lactuca sativa L., adubação orgânica, controle da irrigação.  NUNES, K. G.; COSTA, R. N. T.; CAVALCANTE JÚNIOR, J. A. H.; ARAÚJO, D. F.HEAD LETTUCE BEHAVIOR UNDER DIFFERENT LEVELS OF ORGANIC COMPOST AND IRRIGATION  2 ABSTRACT Lettuce is one of the vegetables cultivated in several regions and nowadays it is easy to see an increase in demand for organic products by consumers, many producers decided to change and start to produce with a new method of cultivation called organic farming. This study aimed to investigate the lettuce yield under different levels of irrigation and compost. It were used five irrigation levels and four different applications of compost. The experimental design was a randomized block in a split-plot with four replications scheme. The results of this study led to the following conclusions: the application of water and compost as production factors allowed raising the average levels of lettuce yield of up to 38.3%; it is possible to obtain the maximum yield with a level of compost equivalent to 6.3 kg m-2; it was observed a decrease lower than 6% in the average level of lettuce productivity when the depth was reduce by 50%, this result shows that this production factor it is not limiting, and it is possible to use an irrigation strategy with deficit; the average values of water productivity grown with the increase in the levels of compost according to a quadratic model. Keywords: Lactuca sativa L., organic fertilization, irrigation control.

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