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

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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PRODUÇÃO DE ALFACE SOB DIFERENTES NÍVEIS DE SALINIDADE DO SOLO

Irriga ◽

10.15809/irriga.2005v10n1p20-29 ◽

2005 ◽

Vol 10 (1) ◽

pp. 20-29 ◽

Cited By ~ 4

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.

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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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Strategies for Improved Water Use Efficiency (WUE) of Field-Grown Lettuce (Lactuca sativa L.) under a Semi-Arid Climate

Agronomy ◽

10.3390/agronomy10050668 ◽

2020 ◽

Vol 10 (5) ◽

pp. 668 ◽

Cited By ~ 5

Author(s):

Nicola Michelon ◽

Giuseppina Pennisi ◽

Nang Ohn Myint ◽

Francesco Orsini ◽

Giorgio Gianquinto

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Lactuca Sativa ◽

Irrigation Water ◽

Irrigation System ◽

Arid Climate ◽

Lactuca Sativa L ◽

Use Efficiency ◽

Irrigation Levels ◽

Semi Arid

Water use efficiency is a main research target in agriculture, which consumes 70% of global freshwater. This study aimed at identifying sustainable water management strategies for the lettuce crop in a semi-arid climate. Three independent experiments were carried out on a commercial variety of lettuce (Lactuca sativa L.) by applying different irrigation levels based on crop evapotranspiration (ETc), estimated through both the Hargreaves–Samani and Penman–Monteith equations. In the first experiment, one treatment was also guided by soil moisture sensors. In the second and third experiments, a factorial combination was used, combining the different irrigation levels with two soil mulching treatments, namely soil without mulch, and soil mulched with dried rice straw residues. The application of different irrigation levels significantly affected plant growth, yield, and physiology. Both the adoption of sensors for guiding irrigation and the application of mulching with straw promoted higher yield. As the irrigation water level was reduced, the WUE (water use efficiency) increased. WUE was also increased by covering the soil with mulch. The experiments point out that accurate management of irrigation water using a drip irrigation system associated with soil mulching increases yield and improves the WUE of lettuce crops in the Central Dry Zone, Myanmar.

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Response of drip irrigated Broccoli (Brassica oleracea var. italica) in different irrigation levels and frequencies at field level

Journal of Applied and Natural Science ◽

10.31018/jans.v10i1.1570 ◽

2018 ◽

Vol 10 (1) ◽

pp. 12-16

Author(s):

Arti Kumari ◽

Neelam Patel ◽

A. K. Mishra

Keyword(s):

Water Resources ◽

Brassica Oleracea ◽

Drip Irrigation ◽

Crop Production ◽

Agricultural Development ◽

Water Productivity ◽

Maximum Yield ◽

Irrigation Frequency ◽

Rapid Urbanization ◽

Irrigation Levels

Geometric increase in population coupled with rapid urbanization, industrialization and agricultural development are causing increased pressure on global water resources. Agriculture is the largest consumer of fresh water resources, thus the scope of enhancing water productivity in agriculture is taken to be the priority area of research. The right amount and frequency of irrigation is essential for optimum use of limited water resources for crop production as well as management. A field experiment with split plot design was carried out during November to February 2015-16 at PFDC (Precision Farming Development Centre), Water Technology Centre, IARI, New Delhi to study the effect of different irrigation levels and frequencies on Broccoli (Brassica oleracea var. italica) under drip irrigation. The experiment included three levels of irrigation frequencies: N1 (once every day), N2 (once every 2 days) and N3 (once every 3 days) with different irrigation levels of 100, 80 and 60 % of crop evapotranspiration (ETc). Results revealed that drip irrigation frequency significantly (p<0.05) affected the broccoli yield. The maximum yield (24.46±0.18 t/ha) was obtained with 80% of ETc with once in 2 days irrigation followed by 100% of ETc with once in 2 days. Lowest yield (16.53±0.1 t/ha) was obtained at 60% of ETc at once in 3 days irrigation. Overall, it was observed that irrigation on 80% of ETc with once in two days is an appropriate cycle for optimum yield of broccoli.

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Pengaruh Penambahan Ca(NO3)2 Terhadap Hasil Tanaman Selada Kriting (Lactuca Sativa L.) pada Sistem Hidroponik Deep Flow Technique (DFT)

Agrotrop : Journal on Agriculture Science ◽

10.24843/ajoas.2020.v10.i02.p08 ◽

2020 ◽

Vol 10 (2) ◽

pp. 190

Author(s):

NI NYOMAN SURYANTINI ◽

GEDE WIJANA ◽

RINDANG DWIYANI

Keyword(s):

Lactuca Sativa ◽

Maximum Yield ◽

Calcium Nitrate ◽

Vegetable Crops ◽

Hydroponic System ◽

Lactuca Sativa L ◽

Deep Flow Technique ◽

The Moment ◽

Require Composition ◽

Nutrient Solutions

The Effect of Addition of Ca(NO3)2 to the Results of Lettuce (Lactuca sativa L.) in the Hydroponic System of Deep Flow Technique (DFT). Plants, in general, require composition, concentration, and volume of nutrient solutions which different depends on the type and phase of plant growth. Leaf vegetable crops such as lettuce (Lactuca sativa L.) require higher Nitrogen (N) nutrients than other vegetable crops, but the problem we faced at the moment is the hydroponic nutrients that are traded only in the general form of nutrient, therefore the addition of N nutrients in the form of calcium nitrate (Ca(NO3)2) needs to be done to meet the needs of lettuce plants. This study was aimed to determine the effect of the addition of Ca(NO3)2 and to find the optimum dosage of the addition of Ca(NO3)2 to the general hydroponic nutrition of vegetables on lettuce use DFT hydroponic system. The treatments consisted of five levels which are nutrition AB Mix general vegetable as a control, and nutrition AB Mix with the addition of 30 g, 60 g, 90 g, and 120 g Ca(NO3)2. The results of the observation showed that the treatment of the addition of Ca(NO3)2 fertilizer had a very significant effect on all observed variables, except for the diameter of the lettuce plant. The optimum addition of Ca(NO3)2 for lettuce was found at 90.04 g with a maximum yield of 207.92 g.

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ALFACE AMERICANA CULTIVADA EM AMBIENTE PROTEGIDO SUBMETIDA A DOSES DE POTÁSSIO E LÂMINAS DE IRRIGAÇÃO

Irriga ◽

10.15809/irriga.2016v21n3p620-630 ◽

2018 ◽

Vol 21 (3) ◽

pp. 620 ◽

Cited By ~ 3

Author(s):

Taynara Tuany Borges Valeriano ◽

Márcio José de Santana ◽

Lázaro José Macedo Machado ◽

Ana Flávia Oliveira

Keyword(s):

Lactuca Sativa ◽

Irrigation Water ◽

Irrigation Management ◽

Weight Ratio ◽

Water Levels ◽

Lactuca Sativa L ◽

Federal Institute ◽

Irrigation Depth ◽

Education Science ◽

Irrigation Levels

ALFACE AMERICANA CULTIVADA EM AMBIENTE PROTEGIDO SUBMETIDA A DOSES DE POTÁSSIO E LÂMINAS DE IRRIGAÇÃO TAYNARA TUANY BORGES VALERIANO1;MÁRCIO JOSÉ DE SANTANA2;ANA FLÁVIA OLIVEIRA3 E LÁZARO JOSÉ MACEDO MACHADO4 1 Eng. Agrônoma, Departamento de Ciências Exatas, Universidade Estadual Paulista/ Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal – SP, CEP São Paulo - CEP 14884-900 – Brasil. [email protected] 2 Eng. Agrônomo, Prof. Dr. em Irrigação e Drenagem, Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro, Uberaba, Uberaba, CEP 38064-300, Uberaba – MG, Brasil. [email protected] Eng. Agrônoma, Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro, Uberaba – MG, Brasil. [email protected] Eng. Agrônomo, Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro, Uberaba – MG, Brasil. [email protected] 1 RESUMO O cultivo de alface em ambiente protegido tem crescido bastante nos últimos anos devido ao maior controle dos fatores ambientais, aliado ao emprego de práticas de irrigação e adubação pode contribuir com o aumento da produtividade e melhoria na qualidade do produto. A partir do exposto, um experimento foi conduzido em casa de vegetação no Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro/IFTM, no município de Uberaba-MG, com o objetivo de avaliar o efeito da aplicação de doses de potássio e lâminas de irrigação na produção de alface americana. O delineamento experimental foi em blocos casualizados, em esquema fatorial 4x4 com três repetições, totalizando 48 unidades experimentais. Foram estudadas quatro doses de potássio (30, 60, 90 e 120 kg ha-1) e quatro lâminas de irrigação (60, 80, 100 e 120% da evapotranspiração da cultura - ETc). Aos 66 dias após o transplantio, determinou-se o diâmetro do caule, a circunferência da cabeça, o número de folhas externas e internas, o peso total da planta e o peso comercial da cabeça. Foi determinada ainda a eficiência do uso da água (EUA) com base na relação peso comercial da cabeça/lâmina de irrigação total aplicada. Observou-se efeito significativo apenas entre as lâminas de irrigação para todas as variáveis estudadas, com resposta crescente até valores próximos a 100% da ETc. A maior EUA de 1,8 g mm-1 foi obtida com a aplicação de 60% da ETc. Palavras-chave: Lactuca sativa L., nutrição, manejo de irrigação. VALERIANO, T. T. B.; SANTANA, M. J.; OLIVEIRA, A. F.; MACHADO, L. J. M. POTASSIUM AND IRRIGATION LEVELS IN THE PRODUCTION OF LETTUCE GROWN IN GREENHOUSES2 ABSTRACTLettuce grown in greenhouses has increased considerably in recent years due to superior control of environmental factors, coupled with the use of irrigation and fertilization practices that contribute to increased yield and improved product quality. Therefore, an experiment was conducted in a greenhouse at the Federal Institute of Education, Science and Technology of the Mineiro Triangle / IFTM, in Uberaba-MG, in order to evaluate the effect of application of potassium doses and irrigation water in the production of lettuce. The experimental design was randomized blocks in a 4x4 factorial design with three replications, totaling 48 experimental units. We studied four potassium doses (30, 60, 90 and 120 kg ha-1) and four irrigation levels (60, 80, 100 and 120% of crop evapotranspiration - ETc). 66 days after transplanting, the stem diameter, head circumference, the number of internal and external leaves, the total weight of the plant and the commercial weight of the head were determined. Water use efficiency (WUE) was also determined based on the commercial weight ratio of the head / Total irrigation depth applied. There was significant effect, among irrigation water levels, for all variables studied, with growing response to values close to 100% of ETC. The superior USA 1.8 g mm-1 was obtained by applying 60% of the ETC.Keywords: Lactuca sativa L., mineral nutrition, irrigation management.

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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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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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Phosphorus requirements of winter-planted lettuce (Lactuca sativa L.) on a Karrakatta sand and the residual value of phosphate as determined by soil test

Australian Journal of Experimental Agriculture ◽

10.1071/ea9960897 ◽

1996 ◽

Vol 36 (7) ◽

pp. 897 ◽

Cited By ~ 1

Author(s):

IR McPharlin ◽

RC Jeffery ◽

DH Pitman

Keyword(s):

Lactuca Sativa ◽

Maximum Yield ◽

Relative Yield ◽

Phosphorus Recovery ◽

Yield Response ◽

Soil Test ◽

Recovery Efficiency ◽

Lactuca Sativa L ◽

Soil Test P ◽

Whole Plants

The phosphorus (P) requirements of crisphead lettuce (Lactuca sativa L. cv. Oxley) was measured over 2 consecutive winter plantings using superphosphate that was freshly applied and applied 9 months before planting, at 0-600 kg/ha on a newly cleared Karrakatta sand of low natural P fertility. There was a significant (P<0.001) head yield response to level of applied P in both years. Phosphorus uptake by whole plants and plant shoots was related to level of applied P in Mitscherlich relationships (R2 = 0.88). Phosphorus recovery efficiency (fertiliser P uptake by shoots/P applied, both in kg/ha) by shoots decreased from 0.16 at 50 to 0.04 at 600 kg applied P/ha. Phosphorus recovery efficiency by whole plants (shoots plus roots) decreased from 0.18 at 50 to 0.05 at 600 kg P/ha. The level of freshly applied P required for either 95 or 99% of maximum relative yield over the 2 years (maximum yield, 86 t/ha) was 276 and 427 kg P/ha (Mitscherlich relationship, R2 = 0.95), respectively at <10 �g/g soil test P (newly cleared sites). The marketable yield was 82 and 95% of total yield at 276 and 427 kg P/ha respectively. Bicarbonate-soluble P extracted from the top 15 cm of soil was determined on residual P sites over 2 years where P was applied at 0-600 kg/ha. These soil test levels were related to head yield in a Mitscherlich relationship (R2 = 0.88). The critical soil test P values required for either 95 or 99% of maximum relative yield, over the 2 years, were 80 and 115 �g/g, respectively. Phosphorus in the wrapper leaf at early heading required for 95 or 99% of maximum yield was 0.59 � 0.03 and 0.61 � 0.03% (spline regression, R2 = 0.80), respectively. Soil and plant testing could be used to assist in reducing fertiliser costs, improving utilisation of freshly- and previously-applied fertiliser P by lettuce and reducing P losses to water systems on the Swan Coastal Plain in Western Australia.

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