scholarly journals Center pivot irrigation management in maize hybrids and the incidence of stalk rot

2020 ◽  
Vol 24 (12) ◽  
pp. 840-846
Author(s):  
Irineu E. Kühn ◽  
Mayara F. Cotrim ◽  
Ricardo Gava ◽  
Rita de C. F. Alvarez ◽  
Job T. de Oliveira ◽  
...  
Keyword(s):  
Block Design ◽  
Irrigation Management ◽  
Management Strategies ◽  
Irrigation Frequency ◽  
Maize Hybrids ◽  
Stalk Rot ◽  
Randomized Block Design ◽  
Center Pivot ◽  
Irrigation Depth ◽  
The One

ABSTRACT This study aimed to verify the incidence of Fusarium spp. in commercial maize hybrids and irrigation management strategies utilizing center pivot systems. The experiment was carried out during the second season in a randomized block design with a split-plot arrangement with five maize hybrids (2B810, MG580, AS1633, DKB290, and AG8544). The plots were irrigated with five frequencies (1, 2, 3, 4, and 5 days) in one experiment, and five water depths (at 25, 50, 75, 100, and 125% of crop evapotranspiration) in another experiment. Plant height, ear insertion height, moisture at harvest time, yield, and incidence of stalk rot were evaluated. Neither irrigation frequency nor irrigation depth influenced the incidence of disease. The one-day irrigation frequency provided the highest yield for maize hybrids. Hybrid 2B810 showed the highest yield and the lowest incidence of the disease.

scholarly journals EFEITO DE DIFERENTES LÂMINAS DE IRRIGAÇÃO NAS VARIÁVEIS DE DESENVOLVIMENTO E PRODUÇÃO DO CAFEEIRO IRRIGADO POR PIVÔ CENTRAL

Irriga ◽  
2015 ◽  
Vol 20 (3) ◽  
pp. 528-543 ◽  
Author(s):  
Marcelo Rossi Vicente ◽  
Everardo Chartuni Mantovani ◽  
ANDRÉ LUÍS TEIXEIRA FERNANDES ◽  
FÁBIO TEIXEIRA DELAZARI ◽  
EDMILSON MARQUES FIGUEREDO
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Coffea Arabica ◽  
Block Design ◽  
Irrigation Management ◽  
Randomized Block Design ◽  
Center Pivot ◽  
Irrigation Depth ◽  
Use Efficiency ◽  
Level Of Significance

EFEITO DE DIFERENTES LÂMINAS DE IRRIGAÇÃO NAS VARIÁVEIS DE DESENVOLVIMENTO E PRODUÇÃO DO CAFEEIRO IRRIGADO POR PIVÔ CENTRAL  MARCELO ROSSI VICENTE1; EVERARDO CHARTUNI MANTOVANI2; ANDRÉ LUÍS TEIXEIRA FERNANDES3; FÁBIO TEIXEIRA DELAZARI4 E EDMILSON MARQUES FIGUEREDO5 1 Instituto Federal do Norte de Minas Gerais, Salinas, MG, [email protected] Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, Viçosa, MG, [email protected] Universidade de Uberaba, Uberaba, MG, Fábio Teixeira Delazari, [email protected] Departamento de Fitotecnia, Universidade Federal de Viçosa, Viçosa, MG, [email protected] Bahia Farm Show, Luís Eduardo Magalhães, BA, [email protected]  1      RESUMO O presente trabalho foi conduzido com objetivo de avaliar o efeito de diferentes lâminas de irrigação nas variáveis de produção, estádios maturação de frutos e eficiência no uso da água pela cultura do cafeeiro irrigado por pivô central equipado com emissores LEPA, na região Oeste da Bahia. Realizou-se o trabalho na fazenda Café do Rio Branco, localizada em Barreiras - BA em cafeeiros adultos da variedade Catuaí IAC 144. O experimento obedeceu ao delineamento de blocos casualizados, composto de cinco tratamentos correspondentes à 70, 85, 100, 125 e 150% da lâmina de irrigação determinada pelo software Irriplus. As produtividades, os estádios de maturação dos frutos e eficiência no uso da água do cafeeiro foram submetidos à análise de variância e regressão, em que os modelos foram escolhidos baseados na significância dos coeficientes de regressão utilizando-se o teste t de 1 a 10% de probabilidade. Diante dos resultados obtidos, pode-se concluir que, a produtividade da cultura do café foi expressivamente dependente da lâmina de água aplicada, sendo que a maior produtividade (60 sc ha-1) foi alcançada com a lâmina de irrigação acumulada de 661 mm ano-1, correspondente à 96% da lâmina de irrigação determinada pelo software Irriplus. A lâmina que proporcionou a máxima porcentagem de frutos cereja (44,1%) foi de 723 mm ano-1 (105%). A lâmina que proporcionou a maior eficiência no uso da água foi de 480 mm ano-1 (70%). Palavras-Chave: Coffea arabica, manejo da irrigação, emissor LEPA, uso eficiente da água.  VICENTE, M. R.; MANTOVANI, E. M.; FERNANDES, A. L. T.; DELAZARI, F. T.; FIGUEREDO, E. M.EFFECTS OF DIFFERENT LEVELS OF IRRIGATION DEPTHS   ON GROWTH AND PRODUCTION VARIABLES OF COFFEE UNDER CENTER PIVOT  IRRIGATION     2        ABSTRACT This study aimed to evaluate the effect of different irrigation depths on yield, ripening stages and water use efficiency by the   coffee crop irrigated by center pivot with LEPA emitters in western Bahia. The experiment was carried out at the Café Rio Branco farm, in Barreiras city, Bahia state, using  adult coffee trees of cv. Catuaí IAC 144. A completely randomized block design was used with five treatments consisting of 70, 85, 100, 125 and 150 % of ETc, determined by the Irriplus software.  Data of yield, fruit ripening stage and water use efficiency were evaluated   using analyses of variance  and regression. Models were chosen based on level of significance of   regression coefficients using the Student´s t-test, 1 to  10% probability.  Based on the results,  coffee crop yield was highly dependent on  the water depth applied. The highest yield (3.6 ton/ha) was achieved  using accumulated irrigation depth of 661 mm year -1 (96 % of Etc).  Water depths of   723 mm year-1 (105 %) and 480 mm year-1 (70% ETc)  provided the highest percentage of cherry fruit (44.1%) and the highest water use efficiency, respectively. Keywords: Coffea arábica, irrigation management, LEPA emitter, water use efficiency.

scholarly journals COMPORTAMENTO PRODUTIVO DO MELOEIRO EM RELAÇÃO À SALINIDADE E FREQUENCIA DE IRRIGAÇÃO1

Irriga ◽  
2003 ◽  
Vol 8 (1) ◽  
pp. 44-50 ◽  
Author(s):  
Adilson David de Barros ◽  
Antonio De Pádua Sousa ◽  
José Francismar de Medeiros
Keyword(s):  
Cucumis Melo ◽  
Block Design ◽  
Water Salinity ◽  
Irrigation Frequency ◽  
Randomized Block Design ◽  
Salinity Levels ◽  
The One ◽  
Production Frequency ◽  
Cucumis Melo L ◽  
E Mail

COMPORTAMENTO PRODUTIVO DO MELOEIRO EM RELAÇÃO À SALINIDADE E FREQUENCIA DE IRRIGAÇÃO1  Adilson David de BarrosDepartamento de Engenharia Agrícola, Centro de Ciências e Tecnologia, Universidade Federal de Campina Grande, Campina Grande, PB. CEP 58109-97. E-mail: [email protected]ônio de Pádua SousaDepartamento de Engenharia Rural,Faculdade de Ciências Agronômicas,Universidade Estadual Paulista, Botucatu, SP. CP 237, CEP 18603-970. E-mail:pá[email protected]é Francismar de MedeirosDepartamento de Engenharia Agrícola, Escola Superior de Agricultura de Mossoró, Mossoró,RN. CEP 59625-900. E-mail: [email protected]  1 RESUMO  Neste trabalho, estudou-se o efeito da água com diferentes níveis salinos em termos de condutividade elétrica (CE = 1,1; 2,5 e 4,5 dS.m-1) e duas frequências de irrigação (1 e 2 dias) na produção da cultivar de melão do tipo HoneyDew (Orange Flesh) e a do tipo cantaloupe (Trusty), em solos de textura franco-arenosa na Fazenda São João Ltda, município de Mossoró-RN. Adotou-se o delineamento experimental em blocos ao acaso no esquema fatorial 3x2x2 com quatro repetições. Dos resultados obtidos, concluiu-se que mesmo sob estresse, a produção de melão irrigado com águas nos níveis salinos de 1,1 dS.m-1 até 2,5 dS.m-1, consegue-se produções economicamente viáveis em relação ao irrigado com as águas de 4,5 dS.m-1. A cultivar Orange Flesh mostrou ser mais sensível aos efeitos dos sais que a Trusty em todos os parâmetros avaliados, demonstrando ser esta última medianamente tolerante aos efeitos deletéricos, reduzindo sua produtividade apenas no nível salino 4,5 dS.m-1, em conformidade com a literatura.  UNITERMOS: Cucumis melo L., salinidade, produção, freqüência  BARROS, A. D.; SOUSA, A. P.; MEDEIROS, J. F. MELON PRODUCTIVE BEHAVIOR IN RELATION TO WATER SALINITY AND IRRIGATION FREQUENCY  2 ABSTRACT  This work has studied the effect of different water salinity levels in terms of electrical conductivity (CE = 1.1; 2.5 and 4.5 dS.m-1) and two irrigation frequencies (1 and 2 days) on HoneyDew (Orange Flesh) and cantaloupe (Trusty) melon production, in loam sand soils in São João Ltda farm, municipal district of Mossoró-RN. The experiment was a 3x2x2 factorial randomized block design with four replications. The results allowed to conclude that even under stress, irrigated melon production at 1.1 dS.m-1 up to 2.5 dS.m-1 saline level water , make production economically feasible in relation to the one at 4.5 dS.m-1 saline level water. Orange Flesh seemed to be more sensitive to the salt effects than the Trusty cultivar in all appraised parameters. Trusty cultivar has shown to be reasonably tolerant to the deleterious effects, decreasing its  productivity only at  4.5 dS.m-1 saline level , which is according to the literature.  KEY-WORDS: Cucumis melo L., salinity, production, frequency

scholarly journals RESPOSTA DA CULTURA DO RABANETE SOB CULTIVO ORGÂNICO AOS FATORES DE PRODUÇÃO ÁGUA E COBERTURA DO SOLO

Irriga ◽  
2021 ◽  
Vol 26 (1) ◽  
pp. 42-54
Author(s):  
Antonio Vanklane de Almeida ◽  
Alexsandro Oliveira Silva ◽  
Jenyffer da Silva Gomes Santos ◽  
Janiquelle da Silva Rabello ◽  
Valsergio Barros da Silva ◽  
...  
Keyword(s):  
Raphanus Sativus ◽  
Block Design ◽  
Irrigation Management ◽  
Ground Cover ◽  
Organic Cultivation ◽  
Randomized Block Design ◽  
Raphanus Sativus L ◽  
Irrigation Depth ◽  
Semi Arid Region ◽  
E Mail

RESPOSTA DA CULTURA DO RABANETE SOB CULTIVO ORGÂNICO AOS FATORES DE PRODUÇÃO ÁGUA E COBERTURA DO SOLO     ANTONIO VANKLANE DE ALMEIDA1; ALEXSANDRO OLIVEIRA DA SILVA1; JENYFFER DA SILVA GOMES SANTOS2; JANIQUELLE DA SILVA RABELO3; VALSERGIO BARROS DA SILVA1 E ALFREDO MENDONÇA DE SOUSA1   1 Departamento de Engenharia Agrícola, Universidade Federal do Ceará, UFC, Av. Mr. Hull, s/n, Pici, CEP:60356-001, bloco 804, Fortaleza, Ceará, Brasil. E-mail: [email protected],  [email protected], [email protected], [email protected]    2 Faculdade de Engenharia Agrícola, Universidade Estadual de Campinas, UNICAMP, Av. Cândido Rondon, 501 - Cidade Universitária, CEP: 13083-875, Campinas, São Paulo, Brasil. E-mail: [email protected] 3 Departamento de Fitotecnia, Universidade Federal do Ceará, UFC, Av. Mr. Hull, s/n, Pici, CEP:60356-001, bloco 805, Fortaleza, Ceará, Brasil. E-mail: [email protected]     1 RESUMO   Em regiões com limitações de recursos hídricos, como semiárido cearense, o uso eficiente da água torna-se a cada dia imprescindível para a produção de hortaliças irrigadas nestas regiões. Neste sentido, a presente pesquisa teve como objetivo a avaliação técnica e econômica do efeito dos fatores de produção água e níveis de cobertura do solo da bagana de carnaúba sobre a produtividade da cultura do rabanete. A pesquisa foi conduzida no período de junho a agosto de 2018 em dois ciclos de produção em área pertencente ao Prece (Programa de Educação em Células Cooperativas), localizado no município de Pentecoste-CE. O experimento foi conduzido em um delineamento em blocos casualizados com quatro repetições. Os tratamentos foram constituídos por cinco lâminas de irrigação (50%; 75%; 100%; 125% e 150% da evapotranspiração das culturas localizada, ETcloc) e cinco diferentes níveis de cobertura morta constituída de bagana de carnaúba:  25%; 50%; 75% e 100% além da testemunha com o solo sem cobertura 0%, totalizando 100 parcelas experimentais. Os resultados permitiram concluir que a bagana de carnaúba apresentou potencial para utilização como cobertura morta no cultivo de rabanete, proporcionando incremento no rendimento da cultura em condições de estratégia de irrigação com déficit para o uso de 16 t ha-1 de cobertura morta. A cultura rabanete responde de forma crescente às diferentes lâminas de irrigação até a ETcloc de 100%, podendo-se obter ganhos econômicos quando associadas à utilização de cobertura morta no solo.   Palavras-chave: Cobertura do solo. Manejo da irrigação. Função de produção. Raphanus sativus L.     ALMEIDA, A. V.; SILVA, A. O.; SANTOS, J. S. G.; RABELO, J. R.; SILVA, V. B.; SOUSA, A. M.  RESPONSE OF RABANET CULTURE UNDER ORGANIC CULTIVATION TO PRODUCTION FACTORS WATER AND SOIL COVERAGE         2 ABSTRACT   In regions with limited water resources, such as the semi-arid region of Ceará, the efficient use of water becomes indispensable every day for the production of irrigated vegetables in this region. In this sense, this research had as objective the technical and economic evaluation of the effect of the factors of production water and levels of the cover of the soil of the bagana on the productivity of the radish culture. The research was conducted in the period from June to August 2018 in two production cycles in area belonging to Prece (Cooperative Cell Education Program), located in the municipality of Pentecoste-CE. The experiment was conducted in a randomized block design with four replicates. The treatments consisted of five irrigation depth (50%, 75%, 100%, 125% and 150% of crop localized evapotranspiration, ET cloc) and five levels of ground cover consisting of carnauba bagana: 25%; 50%; 75% and 100% beyond the control with the soil without 0% coverage, totalizing 100 experimental units. The results allowed to conclude that the carnauba bagana presented potential for use as ground cover in the cultivation of radish, providing an increase in the yield of the crop under conditions of deficit irrigation strategy to use 16 t ha-1 of ground cover. The radish crop significantly responds to the different irrigation depth, up to 100% ET cloc, and economics gains can be obtained when associated with the use of ground cover in soil.   Keywords: Soil cover. Irrigation management. Production function. Raphanus sativus L.

scholarly journals Response of bell pepper crop subjected to irrigation depths calculated by different methodologies

2018 ◽  
Vol 22 (1) ◽  
pp. 45-50
Author(s):  
Gustavo H. da Silva ◽  
Mariane G. Ferreira ◽  
Silvio B. Pereira ◽  
Fábio T. Delazari ◽  
Derly J. H. da Silva
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Block Design ◽  
Irrigation Management ◽  
Fruit Production ◽  
Accurate Estimation ◽  
Randomized Block Design ◽  
Irrigation Depth ◽  
Growth Production ◽  
Use Efficiency

ABSTRACT Water must be supplied to a crop in the proper amount and in a timely manner. Vegetables require a good water availability in soil during their entire cycle. Thus, it is very important the implementation of an irrigation management and accurate estimation of water requirement. The objective of this work was to evaluate the effect of five irrigation depths estimated by the dual-Kc and single-Kc methodologies on the characteristics of growth, production and water use efficiency in the pepper crop. A randomized block design was adopted in a split plot arrangement. The effect of five irrigation depths (50, 75, 100, 125 and 150% of crop evapotranspiration - ETc) was evaluated in the plots, and the methodologies were evaluated in the subplots. It was evaluated the root dry matter, total fruit production, leaf temperature, number of aborted flowers and water use efficiency. The interaction between both effects was not significant for any of the variables. The effect of methodology was observed only on the number of aborted flowers. The effect of the irrigation depths was significant on all variables. The irrigation depths that lead to the best agronomic characteristics were superior to 100% of ETc. The ratio between the irrigation depths estimated by single-Kc and dual-Kc methodologies was 1.14. Single-Kc methodology and irrigation depth of 143% ETc were more suitable for the horticulturist. The most efficient irrigation depth in the use of water was 105% ETc.

scholarly journals DESENVOLVIMENTO DE MUDAS MICROPROPAGADAS DE BANANEIRA SUBMETIDAS A DIFERENTES LÂMINAS E FREQUÊNCIAS DE IRRIGAÇÃO EM AMBIENTE PROTEGIDO

Irriga ◽  
2009 ◽  
Vol 14 (2) ◽  
pp. 180-189
Author(s):  
John Hebert Ferreira Sindeaux ◽  
Benito Moreira de Azevedo ◽  
Thales Vinícius de Araújo Viana ◽  
Ana Cristina Portugal Pinto de Carvalho ◽  
Raquel Aparecida Furlan
Keyword(s):  
Block Design ◽  
Irrigation Management ◽  
Irrigation Frequency ◽  
Irrigation Level ◽  
Musa Spp ◽  
Banana Tree ◽  
Randomized Block Design ◽  
Coir Dust ◽  
Micropropagated Plants

DESENVOLVIMENTO DE MUDAS MICROPROPAGADAS DE BANANEIRA SUBMETIDAS A DIFERENTES LÂMINAS E FREQUÊNCIAS DE IRRIGAÇÃO EM AMBIENTE PROTEGIDO  John Herbert Ferreira Sindeaux1; Benito Moreira de Azevedo2; Thales Vinícius de Araújo Viana2; Ana Cristina Portugal Pinto de Carvalho3; Raquel Aparecida Furlan21Recursos Hídricos e Irrigação e Drenagem, Faculdade de Tecnologia CENTEC - CARIRI, Juazeiro do Norte, CE, [email protected] de Engenharia Agrícola, Universidade Federal do Ceará, Fortaleza, CE.3Embrapa Agroindústria Tropical, Fortaleza, CE.  1 RESUMO O objetivo deste trabalho foi avaliar o desenvolvimento das mudas micropropagadas de bananeira (Musa spp.), cultivar Pacovan produzidas “in vitro” e aclimatizadas em ambiente protegido, sob diferentes lâminas e frequências de irrigação. Foram instalados dois experimentos no ambiente protegido pertencente à Embrapa Agroindústria Tropical, localizada na cidade de Fortaleza, Ceará, durante o período de maio a agosto de 2005. O delineamento estatístico utilizado foi o de blocos ao acaso, com quatro tratamentos e cinco repetições, com oito plantas cada, perfazendo um total de 40 plantas por tratamento testado. As frequências de irrigação foram constituídas de 1, 2, 3 e 4 vezes ao dia e, as lâminas de irrigação foram de 1, 2, 3 e 4 mm dia-1. Na aclimatização de mudas micropropagadas de bananeiras cultivar Pacovan em ambiente protegido, recomenda-se até os 60 dias após o transplantio (DAT), a utilização de uma lâmina de irrigação de 1 mm dia-1 com frequência de irrigação de quatro vezes por dia, e os 90 DAT, uma lâmina e frequência de irrigação de 3 mm dia-1, três vezes por dia. UNITERMOS: manejo da irrigação, pó-de-coco, banana Pacovan  SINDEAUX, J. H. F.; AZEVEDO, B. M. de; VIANA, T. V. de A.; CARVALHO, A. C. P. P. de; FURLAN, R. A. ACCLIMATIZATION OF MICROPROPAGATED BANANA PLANTS SUBMITTED TO FOUR IRRIGATION FREQUENCIES IN GREENHOUSES  2 ABSTRACT The aim of this work was to evaluate the development of the micropropagated plants of Pacovan banana tree (Musa spp.), produced “in vitro” and acclimatized in greenhouse under four different irrigation frequencies for the same irrigation level using green coir dust substrate with wormcompost (3:1) in 180 cm3 pots. The experiment was carried out in a greenhouse of the Embrapa Tropical Agroindustry located inFortaleza,State of Ceará,Brazil (3º44' S and 38º33' W), from May to August, 2005. The experiment had a randomized block design with 4 treatments, four different frequencies of irrigation: 1, 2, 3, and 4 times a day, corresponding to treatments T1, T2, T3 and T4,respectively. Each treatment had five replications with eight plants each, making a total of 40 plants for the tested treatmenst. In the acclimatization of micropropagated plants of Pacovan banana trees in protected greenhouse, the use of irrigation frequency four times a day, until 60 days after the transplantation (DAT) and three times until the 90 DAT is recommended. KEYWORDS: irrigation management, green coir dust substrate, Pacovan banana.

scholarly journals Agronomic performance of maize hybrids under supplemental irrigation depths

2019 ◽  
Vol 23 (7) ◽  
pp. 524-531 ◽  
Author(s):  
Luis H. B. Ben ◽  
Marcia X. Peiter ◽  
Adroaldo D. Robaina ◽  
Jardel H. Kirchner ◽  
Wellington Mezzomo ◽  
...  
Keyword(s):  
Grain Yield ◽  
Technical Efficiency ◽  
Block Design ◽  
Irrigation Management ◽  
Grain Weight ◽  
Crop Season ◽  
Maize Hybrids ◽  
Randomized Block Design ◽  
Use Efficiency ◽  
Technology Level

ABSTRACT The choice of a maize hybrid, considering the technology level and irrigation management, contributes to the improvement of the plant productivity and water use efficiency (WUE). Thus, the objective of this study was to evaluate the effects of irrigation depths on production components, grain yield, technical efficiency, and WUE in maize hybrids. The experiment was conducted in Santiago, RS state, Brazil, in the 2015/2016 and 2016/2017 crop seasons, using a randomized block design in factorial scheme, consisting of five irrigation depths (0, 50, 75, 100 and 125% of crop evapotranspiration - ETc) and four maize hybrids in crop season I (2015/2016), and six maize hybrids in crop season II (2016/2017). The number of ears per plant, number of grains per ear, 100-grain weight, grain yield, and WUE were evaluated. The irrigation depths affected the 100-grain weight, grain yield and WUE in both crop seasons, and the number of grains per ear in crop season I. The irrigation depths increased the productive performance of the maize hybrids from 9.9 to 41% when using irrigation depths of maximum technical efficiency, which varied from 90.1 to 105.4% ETc. The AG9025, P1630 and DKB290 maize hybrids presented the best agronomic performances, with grain yields from 13,609.1 to 16,281.3 kg ha-1.

scholarly journals Drip irrigation in coffee crop under different planting densities: Growth and yield in southeastern Brazil

2014 ◽  
Vol 18 (11) ◽  
pp. 1116-1123 ◽  
Author(s):  
Gleice A. de Assis ◽  
Myriane S. Scalco ◽  
Rubens J. Guimarães ◽  
Alberto Colombo ◽  
Anderson W. Dominghetti ◽  
...  
Keyword(s):  
Plant Density ◽  
Block Design ◽  
Irrigation Management ◽  
Growth And Yield ◽  
Southeastern Brazil ◽  
Soil Water Tension ◽  
Randomized Block Design ◽  
Coffee Plants ◽  
Coffee Cultivation ◽  
Water Tension

Irrigation associated to reduction on planting spaces between rows and between coffee plants has been a featured practice in coffee cultivation. The objective of the present study was to assess, over a period of five consecutive years, influence of different irrigation management regimes and planting densities on growth and bean yield of Coffea arabica L.. The treatments consisted of four irrigation regimes: climatologic water balance, irrigation when the soil water tension reached values close to 20 and 60 kPa; and a control that was not irrigated. The treatments were distributed randomly in five planting densities: 2,500, 3,333, 5,000, 10,000 and 20,000 plants ha-1. A split-plot in randomized block design was used with four replications. Irrigation promoted better growth of coffee plants and increased yield that varied in function of the plant density per area. For densities from 10,000 to 20,000 plants ha-1, regardless of the used irrigation management, mean yield increases were over 49.6% compared to the non-irrigated crop.

scholarly journals Cycle pruning programmed on the grain yield of arabica coffee

2019 ◽  
Vol 43 ◽  
Author(s):  
Diego Corona Baitelle ◽  
Abraão Carlos Verdin Filho ◽  
Sílvio de Jesus Freitas ◽  
Guilherme Bessa Miranda ◽  
Henrique Duarte Vieira ◽  
...  
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Production Capacity ◽  
Additional Treatment ◽  
Control Treatment ◽  
Arabica Coffee ◽  
Randomized Block Design ◽  
Canopy Area ◽  
Plagiotropic Branches ◽  
Productive Development

ABSTRACT The cycle pruning programmed is a reinvigoration technique widely employed in Conilon coffee. This strategy may also be adopted for Arabica coffee to increase its crop longevity and yield. In this scenario, the present study proposes to examine the influence of the cycle pruning programmed on the vegetative and productive development of Arabica coffee. The experiment was developed in the field as a randomized-block design with four replicates. Treatments were tested in a 4 × 2 factorial arrangement consisting of four stem densities (4000, 8000, 12000 or 16000 stems ha-1) and two management strategies for the removal of plagiotropic branches (annual or biennial removal of branches which had reached 70% or more of their production capacity). For some variables, the treatments were organized as a 4 × 2 × 2 factorial arrangement in which the last factor corresponded to two regions of data collection in the plant (upper or lower). For all factorial arrangements, an additional treatment (control) was employed corresponding to traditional pruning (recepa). Annual or biennial removal of plagiotropic branches which had attained 70% or more of their production capacity can be adopted with no losses to crop yield. The cycle pruning programmed improves the distribution of branches, increases canopy area and prevents the occurrence of the “naked neck” phenomenon, observed in control treatment. Additionally, it provides better agronomic and productive performance; therefore, it can be used as a substitute for recepa.

scholarly journals Effect of Hydrogen Peroxide in the Growth of Yellow Passion Fruit Seedlings Under Salinity Stress

2018 ◽  
Vol 10 (10) ◽  
pp. 151 ◽  
Author(s):  
Adriana da S. Santos ◽  
Railene H. C. R. Araújo ◽  
Reginaldo G. Nobre ◽  
Valéria F. de O. Sousa ◽  
Marília H. B. S. Rodrigues ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Salinity Stress ◽  
Irrigation Water ◽  
Block Design ◽  
Harmful Effect ◽  
Passion Fruit ◽  
Biotic And Abiotic Stress ◽  
Randomized Block Design ◽  
The One ◽  
Yellow Passion Fruit

Hydrogen peroxide (H2O2) is a molecule that can flag plants under biotic and abiotic stress conditions. Among the kinds of stress, the salinity stress is the one that most usually affects plants. Consequently, the purpose hereof was to use hydrogen peroxide (H2O2) to mitigate the possible harmful effects of salinity in yellow passion fruit seedlings. We employed a randomized block design, in a 5 × 3 factorial scheme, corresponding to five irrigation water electric conductivity levels (0.3; 1.3; 2.3; 3.3; and 4.3 dS m-1) and three hydrogen peroxide concentrations (0; 5; and 15 μmol L-1), with four repetitions. The treatments were applied foliarly 7 and 15 days after the seedlings’ germination with hand sprayers. Sixty days after sowing, we evaluated the seedlings’ growth and quality variables, which finally proved that hydrogen peroxide mitigates the harmful effect of the irrigation water’s salinity up to 2 dS m-1 in the growth of yellow passion fruit seedlings at the concentration of 5 μmol/L. Nonetheless, excessive concentrations (15 μmol L-1) associated with high salt concentrations were proven detrimental to the seedlings’ phenological growth and quality.

scholarly journals IRRIGATION FREQUENCIES FOR Eucalyptus grandis SEEDLINGS

2020 ◽  
Vol 28 ◽  
pp. 364-374
Author(s):  
Gustavo Henrique Miguel da Cruz ◽  
Fernando França da Cunha ◽  
Epitácio José de Souza ◽  
Andrisley Joaquim da Silva ◽  
Roberto Filgueiras
Keyword(s):  
Seed Quality ◽  
Block Design ◽  
Irrigation Management ◽  
Eucalyptus Grandis ◽  
Volume Ratio ◽  
Crop Coefficient ◽  
Experimental Period ◽  
Dry Mass ◽  
Irrigation Depth ◽  
Total Seed

One of the bottlenecks in relation to the production of forest seedlings is irrigation, especially in less-tech nurseries. The small volumes of substrate, where the seedlings develop, lead to low water storage. This fact can lead to water deficit and significant losses in the production of seedlings, generating even mortality. The objective of this study was to determine the best irrigation frequencies for Eucalyptus grandis seedling production in less-tech nurseries. The experiment was conducted between 2013/08/04 and 2013/23/07 (106 days) and conducted in Chapadão do Sul county, Brazil. The experiment was set up in a randomized complete block design, with five replications. Four irrigation frequencies were tested: IF1 (one daily irrigation - 11:00 a.m.), IF2 (two daily irrigations - 11:00 a.m. and 7:00 p.m.), IF3 (three daily irrigations - 07:00 a.m., 11:00 a.m. and 7:00 p.m.) and IF4 (four daily irrigations - 07:00 a.m., 11:00 a.m., 3:00 p.m. and 7:00 p.m.). The sample units were composed of eight seedlings in 50 cm3 conical tubes filled with soil and vermiculite in a volume ratio of 1:1. The irrigation depth was estimated by reference evapotranspiration (Penman-Monteith) multiplied by a crop coefficient equal to two. Plant height, number of definitive leaves, shoot dry mass (root and total), seed quality index, survival and efficiency of water use by eucalyptus seedlings were evaluated. The average daily irrigation depth in the experimental period was 5.2 mm. Based on the results, it is recommended for eucalyptus seedling producers, in less-tech nursery, irrigation management twice per days. (11:00 a.m. and 7:00 p.m.).

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