PRODUÇÃO DE ALFACE SOB DIFERENTES NÍVEIS DE SALINIDADE DO SOLO

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.

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

Irriga ◽

10.15809/irriga.2017v22n1p167-176 ◽

2018 ◽

Vol 22 (1) ◽

pp. 167-176 ◽

Cited By ~ 1

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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EVALUATION OF METEOROLOGICAL ELEMENTS AND LETTUCE (Lactuca sativa, L.) YIELD RELATED TO GEOGRAPHIC ORIENTATION OF POLYETHYLENE GREENHOUSES

Irriga ◽

10.15809/irriga.2002v7n3p176-184 ◽

2002 ◽

Vol 7 (3) ◽

pp. 176-184

Author(s):

Cláudio Marcio Pereira de Souza ◽

Antonio Evaldo Klar ◽

Luiza Helena Duenhas

Keyword(s):

Lactuca Sativa ◽

Irrigation System ◽

Sao Paulo ◽

São Paulo ◽

Lettuce Plant ◽

Plant Yield ◽

Agricultural Engineering ◽

Lactuca Sativa L ◽

Engineering Department ◽

Meteorological Elements

EVALUATION OF METEOROLOGICAL ELEMENTS AND LETTUCE (Lactuca sativa, L.) YIELD RELATED TO GEOGRAPHIC ORIENTATION OF POLYETHYLENE GREENHOUSES Cláudio Márcio Pereira de SouzaAntonio Evaldo Klar*Department of Agricultural Engineering, College of Agricultural Sciences, State University of São Paulo, P.O. 237, CEP 18603-970, Botucatu – SP. E-mail: [email protected]* Scientific Researcher of CNPqLuiza Helena DuenhasEMBRAPA Semi Árido, P.O. 23, CEP 56300–970, Petrolina – PE. 1 ABSTRACT This experiment was carried out at the Agricultural Engineering Department, FCA/UNESP, Botucatu–SP aiming to study the geographic orientation influence of two plastic tunnels (East/West and North/South based on the magnetic North) on lettuce plant (Lactuca sativa L, cv. Elisa) behavior and on the evaporation distribution uniformity inside the tunnels. The plants were sowed on 05/05/1999, transplanted on 05/29/1999 and harvested on 06/31/1999. Tensiometers were used to monitore soil water potentials. A drip irrigation system was used. Both tunnels received A Class pan and thermohygrographes in the center and 3 m apart small evaporimeters set at 3 heights (0.50 m, 1.00 m and 1.50 m). Through geostatistical analysis, there was not neither spatial dependency nor spatial variability of evaporation in both tunnels. However, the height of evaporimeters showed statistical differences: the 1.50 m height evaporimeter had slower evaporation than those from other heights. The air temperature, relative humidity and vapor pressure deficit averages were not statistically significant in both greenhouses when they were compared to those from the outside. A Class pan evaporation values were higher outside the tunnels than inside them, but there were no differences between both tunnels for this variable. The lettuce plant yield was not influenced by tunnel orientation, but there were significant differences on plant yield among beds inside each tunnel. Keywords: evaporation, irrigation, greenhouse. SOUZA, C. M. P., KLAR, A. E., DUENHAS, L. H. AVALIAÇÃO DE ELEMENTOS METEOROLÓGICOS E PRODUÇÃO DE ALFACE (Lactuca sativa L.) AFETADOS PELA ORIENTAÇÃO GEOGRÁFICA DE ESTUFAS DE POLIETILENO. 2 RESUMO O experimento foi realizado na área experimental do Departamento de Engenharia Rural da Faculdade de Ciências Agronômicas – Unesp/Botucatu, Estado de São Paulo, em duas estufas dispostas em diferentes orientações geográficas, Leste/Oeste e Norte/Sul. A alface (Lactuva sativa L.) cv. Elisa foi cultivada em ambas estufas, sendo semeada em 05/05/99, transplantada em 29/05/99 e colhida em 31/06/99. Utilizou-se tensiômetros para monitorar o potencial de água no solo para realizar o manejo do sistema de irrigação por gotejamento. Microevaporímetros eqüidistantes de 3 m e colocados em 3 alturas, 0.50, 1.00 e 1.50 m, termohigrógrafos e tanques Classe “A” foram instalados nas duas estufas. Através de análise geoestatística, não se observou dependência espacial nem variabilidade espacial da evaporação nas duas estufas. Entretanto, a altura dos evaporímetros apresentou diferenças significativas: a evaporação à altura de 1.50 foi menor que nas outras duas.As médias de temperatura, umidade relativa e déficit de pressão de vapor do arnão diferiram estatisticamente entre as estufas e o ambiente externo. Os valores médios de evaporação de água no tanque Classe “A” instalado fora das estufas diferiram estatisticamente quando comparados com os instalados no interior das estufas, porém, entre as orientações não se constatou diferença significativa. Pôde-se verificar que não houve diferença significativa das características agronômicas da alface em ambas orientações estudadas. No entanto, houve diferença significativa para essas características entre os canteiros no interior das mesmas, havendo variância espacial para os dados de matéria fresca apenas na estufa N/S. UNITERMOS: evaporação, irrigação, estufa.

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ANÁLISE DE CUSTOS E DESEMPENHO AGRONÔMICO NA PRODUÇÃO DE ALFACE SUBMETIDA A NÍVEIS DE IRRIGAÇÃO E USO DE HIDRORRETENTOR

Irriga ◽

10.15809/irriga.2018v1n1p55-70 ◽

2018 ◽

Vol 1 (1) ◽

pp. 55-70

Author(s):

João de Jesus Guimarães ◽

LEANDRO Caixeta Salomão ◽

WELCIO RODRIGUES DA SILVA ◽

HENRIQUE FONSECA ELIAS DE OLIVEIRA ◽

DÉBORA REGINA MARQUES PEREIRA ◽

...

Keyword(s):

Lactuca Sativa ◽

Mato Grosso ◽

Lactuca Sativa L ◽

Federal Institute ◽

Four Levels ◽

And Performance ◽

The Cost ◽

Irrigation Levels ◽

Different Levels ◽

Different Doses

ANÁLISE DE CUSTOS E DESEMPENHO AGRONÔMICO NA PRODUÇÃO DE ALFACE SUBMETIDA A NÍVEIS DE IRRIGAÇÃO E USO DE HIDRORRETENTOR 1JOÃO DE JESUS GUIMARÃES; LEANDRO CAIXETA SALOMÃO2; WELCIO RODRIGUES DA SILVA3; HENRIQUE FONSECA ELIAS DE OLIVEIRA4; DÉBORA REGINA MARQUES PEREIRA5 E MANOEL HENRIQUE REIS DE OLIVEIRA6 1 Departamento de Engenharia Agrícola, Faculdade de Ciências Agronômicas – FCA – Unesp, Câmpus Botucatu, Avenida Universitária, 3780, CEP 18610-034, Altos do Paraíso, Botucatu-SP, Brasil, [email protected] 2 Departamento de Engenharia Agrícola, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] 3 Universidade Estadual de Goiás, Campus Goianésia, Rua 35, nº 436, Setor Sul, Goianésia-GO, Brasil, [email protected] 4 Departamento de Irrigação e Drenagem, Instituto Federal de Educação Ciência e Tecnologia Goiano-- Campus Ceres, Rodovia GO 154, Km 03, s/n, Zona Rural, Ceres-GO, Brasil, [email protected] 5 Prefeitura Municipal de Goianésia, Av. Mato Grosso, nº 61 - Setor Universitário, Goianésia-GO, Brasil, [email protected] 6 Departamento de Irrigação no Cerrado, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Ceres, Rodovia GO 154, Km 03, s/n, Zona Rural, Ceres-GO, Brasil, [email protected] 1 RESUMO Objetivou-se com este trabalho realizar a análise de custo e desempenho agronômico da alface crespa produzida em ambiente protegido submetida a diferentes níveis de irrigação e diferentes doses de solução hidroretentora. O trabalho foi realizado na área experimental do Instituto Federal Goiano - Campus Urutaí-GO, cujas coordenadas geográficas são latitude 17º29’10” S, longitude 48º12’38” O e altitude de 697 m, no período de dezembro de 2017 a janeiro de 2018. O delineamento experimental utilizado foi o de blocos ao acaso, em esquema fatorial (4x5), com parcela subdividida e quatro blocos, em que se utilizaram quatro níveis de irrigação (50, 75, 100 e 125%) da evaporação obtida diariamente, junto ao tanque Classe A e cinco doses de solução de hidrogel (0, 50, 100, 150 e 200 g). Analisou-se o custo de produção considerando os gastos efetivos realizados durante o ciclo produtivo além das variáveis produtividade (PRO) e a eficiência do uso da água (EUA). Os níveis de irrigação e doses de solução hidrorretentora utilizados influenciaram significativamente as variáveis PRO e EUA. A lucratividade cresceu com o aumento das lâminas de irrigação e decresceu com a utilização do hidrogel. Palavras-chave: análise econômica, hidrogel, Lactuca sativa L., viabilidade, lâminas de irrigação. GUIMARÃES, J. J.1; SALOMÃO, L. C.2; SILVA, W. R.3; OLIVEIRA, H. F. E.4; PEREIRA, D. R. M.5; OLIVEIRA, M. H. R.6 ANALYSIS OF COSTS AND AGRONOMIC PERFORMANCE IN LETTUCE PRODUCTION SUBMITTED TO LEVELS OF IRRIGATION AND USE OF HYDRO RETAINER 2 ABSTRACT The objective of this work was to perform an analysis of the cost and performance of crisp lettuce in a protected model, with different levels of irrigation and different doses of hidroretentora solution. The work was carried out in the experimental area of Goiás Federal Institute - Campus Urutaí-GO, geographic positions are latitude 17º29'10 "S, longitude 48º12'38" W and altitude 697 m, excluding the period from December 2017 to January 2018 (4x5), with subdivision of blocks using four levels of irrigation (50, 75, 100 and 125%) of the evaporation obtained daily, to tank Class A and five doses of hydrogel solution (0, 50, 100, 150 and 200 g). The product was analyzed with the advantage of having achieved, during the productive cycle, productive changes and efficiency in water use (USA). Irrigation levels and doses of hydrocortisone solution may significantly influence PRO and US variables. Profitability increased with the increase of irrigation slides and decreased with the use ofhydrogel. Keywords: economic analysis, hydrogel, Lactuca sativa L., viability, irrigation blade.

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GERMINATION AND DEVELOPMENT OF AMERICAN LETTUCE SEEDLINGS (Lactuca sativa L.) IRRIGATED WITH HOME AND INDUSTRIAL EFFLUENT-RECEIVING WATER

Irriga ◽

10.15809/irriga.2004v9n3p207-216 ◽

2004 ◽

Vol 9 (3) ◽

pp. 207-216

Author(s):

Guilherme Augusto Biscaro ◽

Rodrigo De Menezes Trigueiro ◽

Raimundo Leite Cruz ◽

Marcelo Domingos Chamma Lopes

Keyword(s):

Lactuca Sativa ◽

Industrial Effluent ◽

Germination Percentage ◽

Final Size ◽

Mato Grosso ◽

Lactuca Sativa L ◽

Creek Water ◽

Engineering Department ◽

Number Of Leaves ◽

Receiving Water

GERMINATION AND DEVELOPMENT OF AMERICAN LETTUCE SEEDLINGS (Lactuca sativa L.) IRRIGATED WITH HOME AND INDUSTRIAL EFFLUENT-RECEIVING WATER Guilherme Augusto Biscaro1; Rodrigo de Menezes Trigueiro2; Raimundo Leite Cruz2; Marcelo Domingos Chamma Lopes2State University of Mato Grosso do Sul, Cassilândia, MS, (Brazil), [email protected] Engineering Department, Agronomic Science College,Paulista State University , Botucatu-SP (Brazil). 1 ABSTRACT This work has evaluated germination and formation of American lettuce seedlings (Lactuca sativa L.) “Tainá” variety, irrigated with urban effluent-receiving water from Lavapés Creek, a water body which receives all home and industrial sewage of the city of Botucatu, SP (Brazil). The sowing was carried out in 12 plastic foam trays with 32 germination cells each. At 41 days after planting (41-DAP), the seed germination percentage, seedling final size, final number of leaves, the mass of shoot and root dry matter were evaluated. Also, two sorts of substrates were investigated: Multiplantâ and Plug Mixâ. No complementary fertilization was done, so the only available nutrients were the ones originally present in the substrates and in the creek water. For compararison an evaluation was performed using a source of treated water instead of the creek water. Results pointed out that all sown seeds presented 100% of germination. Treatments with Multiplantâ presented the greatest values for plant height. Treatments irrigated with Lavapés Creek water presented a greater number of leaves at 41-DAP. KEYWORDS: Seedling germination, Lactuca sativa L., effluent receiving water. BISCARO, G. A.; TRIGUEIRO, R. M.; CRUZ, R. L.; LOPES, M. D. C. GERMINAÇÃO E DESENVOLVIMENTO DE MUDAS DE ALFACE AMERICANA (Lactuca sativa L.) IRRIGADOS COM ÁGUAS RECEPTORAS DE EFLUENTES DOMÉSTICOS E INDUSTRIAIS 2 RESUMO O trabalho avaliou a germinação e a formação de mudas de alface americana (Lactuca sativa L.) variedade “Tainá”, irrigada com águas receptoras de efluentes urbanos do Ribeirão Lavapés, curso d’água que recebe todo o esgoto doméstico e industrial da cidade de Botucatu – SP (Brasil). A semeadura foi realizada em 12 bandejas de isopor com 32 células de germinação cada. Foram analisados com 41 dias após o plantio (41-DAP), a porcentagem de germinação das sementes, o tamanho final das mudas, o número final de folhas, a massa de matéria seca da parte aérea e de raízes. Também foram estudados dois tipos de substrato: Multiplantâ e Plug Mixâ. Não foi utilizada nenhuma adubação complementar, estando disponível apenas os nutrientes presentes originalmente nos substratos e na água do ribeirão. Para efeito comparativo, realizou-se a mesma avaliação utilizando uma fonte de água tratada. Os resultados indicaram que todas as células semeadas apresentaram 100% de germinação. Os tratamentos que utilizaram o Multiplantâ apresentaram maiores valores de altura de plantas e os irrigados com a água do Ribeirão Lavapés, apresentaram maior número de folhas com 41-DAP. UNITERMOS: Germinação de mudas, Lactuca sativa L., águas receptoras de efluentes.

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EFFECT OF DIFFERENT SOIL MOISTURE LEVELS AND NITROGEN SOURCES ON LETTUCE YIELD (Lactuca sativa L.) UNDER SURFACE AND DRIP IRRIGATION SYSTEMS IN CLAY LOAM SOILS

Journal of Plant Production ◽

10.21608/jpp.2015.52123 ◽

2015 ◽

Vol 6 (12) ◽

pp. 1957-1974 ◽

Cited By ~ 1

Author(s):

Seham Ali ◽

T. Eid ◽

A. Abd Elhady

Keyword(s):

Soil Moisture ◽

Lactuca Sativa ◽

Drip Irrigation ◽

Nitrogen Sources ◽

Clay Loam ◽

Irrigation Systems ◽

Lactuca Sativa L ◽

Lettuce Yield

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PENGARUH DOSIS PUPUK KANDANG AYAM YANG DIBERIKAN DENGAN CARA YANG BERBEDA TERHADAP SIFAT TANAH DAN HASIL TANAMAN SELADA (Lactuca sativa L.) DI MEDIA GAMBUT

JURNAL AGROTEKNOLOGI ◽

10.24014/ja.v11i2.11071 ◽

2021 ◽

Vol 11 (2) ◽

pp. 85

Author(s):

Arif Hidayat ◽

Ervina Aryanti ◽

Yusmar Mahmud

Keyword(s):

Lactuca Sativa ◽

Peat Soil ◽

Animal Manure ◽

Fertilizer Application ◽

Chicken Manure ◽

Total N ◽

Lactuca Sativa L ◽

Randomized Design ◽

Number Of Leaves ◽

Completely Randomized Design

Manure is a fertilizer derived from animal manure, which can improve the structure of peat soil and provide nutrients for lettuce plants (Lactuca sativa L.). Peat soil is a type of soil that has many obstacles in cultivation including acidic pH, low nutrient availability such as N, P, and K. Manure can be used in solid and liquid forms. This study aims to determine the dosage and the appropriate way of giving chicken manure to the yield of lettuce and the nature of the soil after being given chicken manure. This research has been carried out from April to June 2018 on experimental land, Agronomy Laboratory. This study used a Completely Randomized Design (CRD) with 7 treatments namely without fertilizer application (control), 37.5 g solid fertilizer of chicken manure, 75 g solid fertilizer of chicken manure, 112.5 g solid fertilizer of chicken manure, 37.5 g of solid fertilizer thawed chicken manure,75 g of solid fertilizer thawed chicken manure, 112.5 g of solid fertilizer thawed chicken manure. The results showed that 112.5 g solid manure from chicken manure was the appropriate dose to increase the growth of lettuce plants, namely plant height (15.48 cm), leaf width (11.60 cm), number of leaves (11.00 strands), weight plant (37.83 g), weight root plant (3.48 g), and increasing the total N content of the soil (0.40%).

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Pengaruh Konsentrasi Nitrogen Dan Plant Catalyst Terhadap Pertumbuhan Dan Hasil Tanaman Selada (Lactuca sativa L.) Secara Hidroponik

Jurnal Penelitian Pertanian Terapan ◽

10.25181/jppt.v15i2.117 ◽

2017 ◽

Vol 15 (2) ◽

Author(s):

Gorendva R. Warganegara ◽

Yohanes Cahya Ginting ◽

Kushendarto Kushendarto

Keyword(s):

Lactuca Sativa ◽

Nitrogen Concentration ◽

Combined Treatment ◽

Fertilizer Application ◽

Growth And Yield ◽

Experimental Unit ◽

Full Potential ◽

Time Data ◽

Liquid Fertilizer ◽

Lactuca Sativa L

Lettuce (Lactuca sativa L.) is a vegetable plant which consumption in fresh form. Color, texture, and aroma lettuce can beautify also be an ornamental dish of food. Request lettuce until now has not met its full potential, it is because there are obstacles in cultivation that influence the quality and production results. One technique that can be used in the cultivation of lettuce ie hydroponic. The purpose of this study was to: (1) To know the effect of Catalyst Plant on growth and yield of plants in hydroponic lettuce, (2) To know the effect of the concentration of nitrogen on the growth and yield of plants in hydroponic lettuce, (3) To determine the concentration of nitrogen in response to the liquid fertilizer Catalyst Plant. This study uses a randomized group design perfect (RKTS) arranged factorial (5x2) with three replications. The first factor is the nitrogen concentration of 200 ppm, 225 ppm, 250 ppm, 275 ppm, 300 ppm supplied from planting as much as 3 times a day. The second factor is the provision of liquid fertilizer Catalyst Plant (P1) and without giving liquid fertilizer (P0) with a concentration of 2 g / L of water. Interval application of liquid fertilizer once a week until harvest time. Data were analyzed by analysis of variance to investigate the influence of the treatment applied. If there are significant between the treatment continued with the separation of the middle value of Orthogonal polynomial at 5%. Of the two factors obtained 10 combined treatment with 3 replications and obtained 30 experimental units. Each experimental unit planted two plants, so that the overall use of 60 trial plants Catalyst Plant liquid fertilizer application resulted in better plant growth compared without giving liquid fertilizer. Increased nitrogen concentration of 25 ppm, the concentration of 250-300 ppm improve the growth of plant height of 0.02 cm, 0.01 cm long roots, and plant fresh weight of 0.03 grams (11:12%). There are a response to the nitrogen concentration of liquid fertilizer Catalyst Plant . Keywords: Grand Rapid lettuce, hydroponics, Catalyst Plant, the concentration of nitrogen

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

10.1101/2021.01.01.425018 ◽

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.

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