scholarly journals Effects of Hydrogen Peroxide on Hydroponic Lettuce Grown With Conventional and Organic Fertilizers [Cornell University]

2019 ◽  
Author(s):  
Vanessa M. Lau ◽  
Neil S. Mattson
Keyword(s):  
Hydrogen Peroxide ◽  
Microbial Respiration ◽  
Root Zone ◽  
Organic Fertilizers ◽  
Pathogenic Microorganisms ◽  
Trial And Error ◽  
Dissolved Oxygen Concentration ◽  
Cornell University ◽  
Lactuca Sativa L ◽  
Lettuce Yield

H2O2, commonly referred to as hydrogen peroxide, is an unstable oxidizing agent often used by hydroponic growers to help clear unwanted biofilm and pathogenic microorganisms by releasing free radicals that interact with the microbes. Other byproducts produced by the decomposition of hydrogen peroxide are simply H2O and O2. The released O2 increases the dissolved oxygen concentration in the root zone and may also help reduce oxygen losses to biofilm and microbial respiration. However, the suggested concentration of hydrogen peroxide varies greatly among hobbyists and are typically determined on a trial and error basis and excess H2O2 can cause damage to roots. With little to no scientifically backed information available on the topic, the aim of this study is to determine the effect of H2O2 concentrations in deep water culture hydroponics by assessing how it affects biofilm caused by the use of organic fertilizers, root development, and consequently, yield in lettuce (Lactuca sativa L.) ‘Oak Leaf’. In this experiment, three different treatments consisting of a control, 1.25 mL/L, and 2.5 mL/L of hydrogen peroxide are added to aerated 4-L reservoirs that are fertilized with either organic (4-1-1) or inorganic nutrients (21-5-20), both applied at 150 mg·L-1 N. Three replicates for each treatment and each fertilizer are prepared resulting in a total of eighteen reservoirs with one head of lettuce in each. By the end of this study, it was found that when added to conventional fertilizers, doses of 1.25 mL/L and 2.5 mL/L of hydrogen peroxide stunted the growth of or killed the heads of lettuce.  However, when applied to organic fertilizers, the lettuce yield nearly matched that of the conventionally fertilized control.

scholarly journals Effects of Hydrogen Peroxide on Organically Fertilized Hydroponic Lettuce (Lactuca sativa L.)

2021 ◽  
Author(s):  
Vanessa Lau ◽  
Neil Mattson
Keyword(s):  
Hydrogen Peroxide ◽  
Lactuca Sativa ◽  
Plant Size ◽  
Organic Fertilizers ◽  
Microbial Populations ◽  
Stunted Growth ◽  
Lactuca Sativa L ◽  
Lettuce Yield ◽  
The Impact ◽  
Viable Method

AbstractHydroponic production typically uses conventional fertilizers and information is lacking on the use of organic hydroponic fertilizers. Development of biofilm is a common problem with organic hydroponics which can reduce dissolved oxygen availability to roots. One potential solution is the use of hydrogen peroxide, H2O2 which can reduce microbial populations and decomposes to form oxygen. However, information is lacking on the impact of hydrogen peroxide on hydroponic crops. The aim of this study was to determine the effects of H2O2 concentrations in deep water culture hydroponics by assessing how it affects plant size and yield in lettuce (Lactuca sativa L.) ‘Rouxai’. In this experiment, three different treatments consisting of a control without H2O2, and the application of 37.5 mg/L or 75 mg/L of hydrogen peroxide were added to aerated 4-L reservoirs that contained either organic (4-4-1) or inorganic nutrients (21-5-20), both applied at 150 mg·L-1 N. Three replicates for each treatment and each fertilizer were prepared resulting in a total of eighteen mini hydroponic containers each with one head of lettuce. When added to conventional fertilizers, concentrations of 37.5 mg/L and 75 mg/L of H2O2 led to stunted growth or death lettuce plants. However, when 37.5 mg/L of H2O2 was applied to organic fertilizers, the lettuce yield nearly matched that of the conventionally fertilized control, demonstrating that the application of H2O2 has the potential to make organic hydroponic fertilization a more viable method in the future.

scholarly journals Effects of Hydrogen Peroxide on Organically Fertilized Hydroponic Lettuce (Lactuca sativa L.)

Horticulturae ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. 106
Author(s):  
Vanessa Lau ◽  
Neil Mattson
Keyword(s):  
Hydrogen Peroxide ◽  
Lactuca Sativa ◽  
Organic Fertilizer ◽  
Plant Size ◽  
Organic Fertilizers ◽  
H2o2 Treatment ◽  
Lactuca Sativa L ◽  
Lettuce Yield ◽  
Fertilizer Combination ◽  
The Impact

Hydroponic production typically uses conventional fertilizers, but information is lacking on the use of organic hydroponic fertilizers. Development of microbial communities and biofilm that can reduce dissolved oxygen availability is a difficulty with organic hydroponics. One potential solution is the use of hydrogen peroxide (H2O2) which can reduce microbial populations and decompose to form oxygen. However, information is lacking on the impact of hydrogen peroxide on hydroponic crop performance. The aim of this study was to determine the effects of H2O2 concentrations in deep water culture hydroponics by assessing how it affects plant size and yield in lettuce (Lactuca sativa L.) “Rouxai”. In this experiment, three H2O2 treatments, namely the application of 0, 37.5 or 75 mg/L H2O2 to 4 L aerated hydroponic containers with either conventional or organic fertilizer, were compared. The containers had either fish-based organic fertilizer (4-4-1, N-P2O5-K2O) or inorganic mineral based conventional nutrient solution (21-5-20, N-P2O5-K2O), both applied at 150 mg/L N. Three replicates of each H2O2 treatment–fertilizer combination were prepared resulting in a total of eighteen mini hydroponic containers each with one head of lettuce. There were two growth cycles: fall 2018 and spring 2019. When added to conventional fertilizers, both 37.5 mg/L and 75 mg/L of H2O2 led to stunted growth or death of lettuce plants. However, when 37.5 mg/L of H2O2 was applied to organic fertilizers, the lettuce yield nearly matched that of the conventionally fertilized control, demonstrating that the application of H2O2 has the potential to make organic hydroponic fertilization a more viable method in the future.

scholarly journals Quality of Organic Compost for Vegetable Planting

Proceedings ◽  
2020 ◽  
Vol 38 (1) ◽  
pp. 14
Author(s):  
Segatelli ◽  
Pimenta ◽  
Peixoto ◽  
Silva ◽  
Bosco
Keyword(s):  
Control Object ◽  
Dry Mass ◽  
Organic Fertilizers ◽  
Lactuca Sativa L ◽  
Coffee Grounds ◽  
Npk Fertilizer ◽  
Dairy Sludge ◽  
Tree Pruning ◽  
Organic Compost

Composting is a technique used to obtain a nutrient-rich, plant-like organic compost. Considering that there are few studies that shows the efficiency of these composts in the cultivation of vegetables, the objective of this study was to evaluate, in the cultivation of lettuce, the quality of the final compost obtained from tree pruning, dairy sludge and coffee grounds—compost 1; grass, dairy sludge and coffee grounds—compost 2; grass, dairy sludge, coffee grounds and boiler ash—compost 3. Lettuce (Lactuca Sativa L.) were planted for the study with the three composts and a control object-without compost, and a portion with NPK fertilizer. The evaluated parameters were plant growth, head diameter, leaf number, dry mass and fresh mass. The results shows statistical similarities between the organic fertilizers and NPK fertilizer in the evaluated parameters and the control plot presented inferior results to the other plots, emphasizing the need for fertilization at each planting.

scholarly journals Role of hydrogen peroxide and Pharmaplant-turbo against cucumber powdery mildew fungus under organic and inorganic production

2008 ◽  
Vol 14 (3) ◽  
Author(s):  
Y. M. Hafez ◽  
Y. A. Bayoumi ◽  
Z. Pap ◽  
N. Kappel
Keyword(s):  
Hydrogen Peroxide ◽  
Powdery Mildew ◽  
Disease Severity ◽  
Ascorbic Acid Content ◽  
Plant Diseases ◽  
Organic Fertilizers ◽  
Nitrate Content ◽  
Antifungal Compound ◽  
Powdery Mildew Fungus ◽  
Cucumber Powdery Mildew

Cucumber leaves have been sprayed with a solution of hydrogen peroxide (H202) or Pharmaplant-turbo combined with organic or inorganic fertilizers under plasic house. Under the influence of H202, leaves exhibited resistant against Podoshaera fusca fungus, the causal agent of cucumber powdery mildew. H202 (15 mM) was able to decrease the disease severity from 90.4% to 12% in two experiments conducted in two seasons. Pharmaplant-turbo (Turbo) is new chemical compound and used as an antifungal compound. Turbo in 1 ml/L was able to decrease the disease severity from 90.4% to 11.5% in the both experiments as well. Both of H202 and Turbo were combined with organic treatment (compost + compost tea + seaweed extracts) which showed significant effect against cucumber powdery mildew fungus and strongly suppressed it as compared to control leaves. Organic treatment produced higher vegetative growth characters and greater early and total yields as compared to inorganic treatment, also organic fruits produced the lower nitrate content and the higher ascorbic acid content as compared to inorganic fruits. Our study have indicated that, H202 and Turbo combined with organic fertilizers play a role in the resistance of cucumber against powdery mildew by decreasing the disease severity. We suggest to give more attention to the direct application of H202 in low concentration and Turbo against powdery mildew diseases and other plant diseases.

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.

Removal of pathogens from wastewaters by the root zone method (RZM)

1995 ◽  
Vol 32 (3) ◽  
pp. 211-218 ◽  
Author(s):  
Fermin Rivera ◽  
Alan Warren ◽  
Elizabeth Ramirez ◽  
Olivier Decamp ◽  
Patricia Bonilla ◽  
...  
Keyword(s):  
Root Zone ◽  
Climatic Conditions ◽  
Pathogenic Microorganisms ◽  
Faecal Coliforms ◽  
Treatment Efficiency ◽  
Zone Method ◽  
Free Living ◽  
Gravel Beds ◽  
Helminth Eggs ◽  
Better Than

Full-scale and laboratory-scale artificially constructed reed beds utilising the root zone method (RZM) of wastewater treatment were investigated for their removal efficiencies of a range of pathogenic microorganisms. Performances were compared for RZMs employing different hydrophytes, planting substrates and climatic conditions. All pathogens were removed by the RZM to some extent. Planted beds generally performed better than unplanted beds although the type of hydrophyte used was not significant. Gravel beds were more efficient than soil beds in the removal of protozoan pathogens and of helminth eggs; numbers of these pathogens were below levels of detection in gravel bed effluents. For faecal coliforms the type of planting substrate was not significant, providing hydrophytes were present. Climatic conditions made little difference to treatment efficiency although seasonal variation was observed in temperature climates, where the removal of faecal coliforms declined in the winter months, and in subtropical climates where higher numbers of free-living amoebae were recorded during the summer. It was concluded that the RZM is a suitable method for the treatment of domestic wastewaters in tropical and subtropical regions of Mexico.

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.

scholarly journals Canopy Cover and Root-zone Heating Effects on Fall- and Spring-grown Leaf Lettuce Yield in Ohio

2011 ◽  
Vol 21 (6) ◽  
pp. 737-744 ◽  
Author(s):  
Natalie R. Bumgarner ◽  
Mark A. Bennett ◽  
Peter P. Ling ◽  
Robert W. Mullen ◽  
Matthew D. Kleinhenz
Keyword(s):  
Crop Yield ◽  
Trifolium Pratense ◽  
Root Zone ◽  
Canopy Cover ◽  
Electric Heating ◽  
Leaf Biomass ◽  
Peat Moss ◽  
High Tunnel ◽  
High Tunnels ◽  
Lettuce Yield

Low and high tunnels and root-zone heating systems are proven tools in horticultural production. However, impacts of their separate and combined application on crop yield, composition, and microclimates are underreported. We addressed these gaps in the literature by exposing lettuce (Lactuca sativa) to four microclimates established with low and high tunnels and root-zone heating during the spring and fall of 2 years in Wooster, OH. Red-leaved romaine lettuce cultivars Outredgeous and Flagship were direct-seeded into raised beds in both outdoor and high-tunnel settings in early October and late March and harvested multiple times over 4 weeks. Half of all plots in each setting were underlain by electric heating cables, and half were covered with 0.8-mil, clear, vented, low tunnels. A growing medium consisting of peat moss, compost, soil, and red clover (Trifolium pratense) hay was used, and all plots were overhead-irrigated. Soil and air temperatures were monitored throughout the experiments, which were repeated four times (2 seasons/year × 2 years). Here, we report primarily on treatment effects on crop yield and related variables. Root- and shoot-zone conditions and cultivar significantly affected leaf biomass in both settings (outdoor, high tunnel), while population was more often affected in the outdoor experiments. Microclimate main effects were more prevalent than cultivar effects or interactions. Leaf yield was greater in low-tunnel-covered and bottom-heated plots than in uncovered and unheated plots. We take these data as further evidence of the potential to alter lettuce yield through root- and shoot-zone microclimate modification, particularly in regions prone to dynamic seasonal and within-season temperature and light conditions. The data also suggest that the relative performance of low and high tunnels in the production of short-statured, quick-cycling crops during fall and spring be more thoroughly evaluated.

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