Morphophysiology of yellow passion fruit seedlings under application of nitrogen and potassium and irrigation with high-salinity water

Salinity is one of the most problematic abiotic stresses in agriculture globally, especially in semi-arid regions. Thus, the application of nutrients, such as nitrogen and potassium to improve plant nutritional conditions may be a viable alternative to minimize the negative effects of saline stress. Therefore, the aim of this study was to evaluate the morphophysiological behavior of yellow passion fruit seedlings under varying nitrogen and potassium doses and irrigation with salt water. The experimental design was a randomized complete block with a 5 x 5 incomplete factorial scheme, generated from the Central Composite Design with five electrical conductivities of irrigation water (0.5, 0.98, 2.15, 3.32, and 3. 80 dS m-1) and five increasing doses of nitrogen and potassium (0.0, 29.08, 100.0, 170.92, and 200.0%). Leaf, stem, and root dry phytomass and gas exchange were evaluated 75 days after sowing. The increase in salinity had negative effects on the morphological and physiological characteristics of yellow passion fruit seedlings. The application of nitrogen and potassium positively influenced photosynthetic rate and leaf and root dry phytomasses. The application of nitrogen and potassium increased intercellular CO2 concentration and transpiration in yellow passion fruit seedlings under saline stress.

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Sensitivity of yellow passion fruit to ultraviolet-B radiation

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2012001000002 ◽

2012 ◽

Vol 47 (10) ◽

pp. 1422-1427 ◽

Cited By ~ 1

Author(s):

Inês Cechin ◽

Valéria de Jesus Rocha ◽

Terezinha de Fátima Fumis

Keyword(s):

Intercellular Co2 Concentration ◽

Co2 Concentration ◽

Ultraviolet B ◽

Passion Fruit ◽

Dry Matter Accumulation ◽

Passiflora Edulis ◽

Solar Noon ◽

Use Efficiency ◽

Yellow Passion Fruit ◽

Intercellular Co2

The objective of this work was to evaluate the effects of UV-B radiation on the vegetative growth and on the gas exchange characteristics of passion fruit plants (Passiflora edulis) grown in greenhouse. The average unweighted UV-B radiation near the apex of the plants was 8 W m-2 for the UV-B treatment (high UV-B), and 0.8 W m-2 for the control plants (low UV-B). Plants were irradiated with UV-B for 7 hours per day, centered on solar noon, during 16 days. High UV-B radiation resulted in lower shoot dry matter accumulation per plant. The content of UV-B absorbing compounds and anthocyanins was increased in the plants exposed to high UV-B radiation, when compared with the control. UV-B radiation did not affect stomatal conductance or transpiration rate, but reduced photosynthesis and instantaneous water-use efficiency, and increased intercellular CO2 concentration. The accumulation of UV-B-absorbing compounds and anthocyanins did not effectively shield plants from supplementary UV-B radiation, since the growth and photosynthetic processes were significantly reduced.

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Physiological Responses of Cowpea (Vigna unguiculata) Under Irrigation With Saline Water and Biostimulant Treatment

Journal of Agricultural Science ◽

10.5539/jas.v10n12p24 ◽

2018 ◽

Vol 10 (12) ◽

pp. 24

Author(s):

Leonardo Vieira de Sousa ◽

Rayanne Maria Paula Ribeiro ◽

Manoel Galdino dos Santos ◽

Fernando Sarmento de Oliveira ◽

Hugo Ferreira ◽

...

Keyword(s):

Vigna Unguiculata ◽

Saline Water ◽

Net Photosynthesis ◽

Co2 Concentration ◽

Dry Mass ◽

Saline Stress ◽

Stress Effect ◽

Negative Effects ◽

Shoot Height ◽

Cowpea Cultivars

Cowpea (Vigna unguiculata) is one of the world’s main crops, and it is a fundamental source of protein for semiarid regions population. In these regions, the use of high salts concentration water in irrigation systems is one of the major factors that contributes to reduced cowpea yield. One way to alleviate the negative effects of salinity is through the biostimulants application, which is a product that has beneficial substances to the plants metabolism. The aim of this study was to evaluate the application of biostimulant in cowpea cultivars under irrigation with saline water. The study was carried out in the Agrarian Sciences Center, of the Department of Agronomic and Forest Sciences of the Federal Rural University of the Semi-Arid, in the city of Mossoró, RN. The experimental design was completely randomized, with four replications. The treatments were arranged in 5 × 2 × 2 factorial scheme, with five doses of biostimulant (0, 15, 30, 45 and 60 mL L-1), two electrical conductivities of the irrigation water (0.5 and 5.0 dS m-1), and two cowpea cultivars (IPA-206 and BRS Guariba). The evaluated characteristics were: chlorophyll content index, stomatal conductance, net photosynthesis, internal CO2 concentration, transpiration rate, shoot height, stem diameter and shoot dry mass. The biostimulant application was not efficient in attenuating the salinity stress effect on the development of cowpea cultivars. The higher biostimulant concentrations along with the use of saline water increased the negative effects of salinity on the cowpea plants physiology. There was no difference between the cultivars regarding the tolerance to saline stress and the application of biostimulant.

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Gas exchange in yellow passion fruit under irrigation water salinity and nitrogen fertilization

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v26n2p135-141 ◽

2022 ◽

Vol 26 (2) ◽

pp. 135-141

Author(s):

José A. C. Wanderley ◽

Carlos A. V. de Azevedo ◽

Marcos E. B. Brito ◽

Fagner N. Ferreira ◽

Mailson A. Cordão ◽

...

Keyword(s):

Gas Exchange ◽

Irrigation Water ◽

Nitrogen Fertilization ◽

Co2 Concentration ◽

Passion Fruit ◽

Water Salinity ◽

Irrigation Water Salinity ◽

Electrical Conductivities ◽

Salinity Levels ◽

Internal Co2

ABSTRACT The objective of this study was to evaluate the gas exchange of ‘Redondo Amarelo’ passion fruit seedlings under the mitigating action of nitrogen fertilization on the salinity of irrigation water. The experiment was carried out in a greenhouse of the Universidade Federal de Campina Grande (CCTA-UFCG), Campus of Pombal, PB, Brazil, The experimental design was in randomized blocks, split plots, comprising five irrigation water electrical conductivities (plot) (ECw) (0.3; 1.0; 1.7; 2.4 and 3.1 dS m-1) and five doses of nitrogen (subplot) (60; 80; 100; 120 and 140% of 300 mg of N dm-3), in five blocks. Plants were grown in pots (Citropote JKS®) with volume of 3.780 mL, filled with soil, bovine manure, wood shavings in a proportion of 2:1:0.5 (mass basis), respectively. Water with salinity levels was applied in the period from 40 to 85 days after sowing. The internal CO2 concentration, transpiration, stomatal conductance and photosynthesis were measured at 55 and 70 days after sowing. There was an attenuating effect of nitrogen doses at irrigation water electrical conductivities of 1.7 and 2.4 dS m-1 on photosynthesis at 55 DAS. Irrigation water salinity reduces most of the variables evaluated, especially at the highest level studied (3.1 dS m-1).

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PRODUTIVIDADE DA CULTURA DO AMENDOIM SOB DIFERENTES SUPRESSÕES DA IRRIGAÇÃO COM ÁGUA SALINA

Irriga ◽

10.15809/irriga.2021v26n2p210-220 ◽

2021 ◽

Vol 26 (2) ◽

pp. 210-220

Author(s):

Geovana Ferreira Goes ◽

Geocleber Gomes de Sousa ◽

Samuel de Oliveira Santos ◽

Francisco Barroso da Silva Júnior ◽

Emanuel D'Araújo Ribeiro de Ceita ◽

...

Keyword(s):

Water Deficit ◽

Arachis Hypogaea ◽

Saline Water ◽

Salt Water ◽

Water Suppression ◽

Saline Stress ◽

High Salinity Water ◽

Arachis Hypogaea L ◽

Salinity Water ◽

E Mail

PRODUTIVIDADE DA CULTURA DO AMENDOIM SOB DIFERENTES SUPRESSÕES DA IRRIGAÇÃO COM ÁGUA SALINA GEOVANA FERREIRA GOES1; GEOCLEBER GOMES DE SOUSA2; SAMUEL DE OLIVEIRA SANTOS1; FRANCISCO BARROSO DA SILVA JUNIOR3; EMANUEL D’ ARAÚJO RIBEIRO DE CEITA4 E KELLY NASCIMENTO LEITE5 1 Graduandos no curso de Agronomia da Universidade da Integração Internacional da Lusofonia Afro-Brasileira (Avenida da Abolição, 3, centro, 62.790-000, Redenção/Ce, Brasil). E-mails: [email protected]; [email protected]. 2 Prof. Doutor, Instituto de Desenvolvimento Rural, Universidade da Integração Internacional da Lusofonia Afro-Brasileira (Avenida da Abolição, 3, centro, 62.790-000, Redenção/Ce, Brasil). E-mail:[email protected]. 3Mestrando pelo Programa de Pós-graduação em Ciência do Solo da Universidade Federal do Ceará, Campus do Pici (Avenida Mister Hull, 2977, Pici, 60.021-970, Fortaleza/Ce, Brasil) Email: [email protected]. 4Mestrando pelo Programa de Pós-graduação em Agronomia (Ciência do Solo) da Faculdade de Ciências Agrárias e Veterinárias (Rua: Prof. Paulo Donato Castellane, SN, 14.004-900, Jaboticabal/SP, Brasil) E-mail: [email protected]. 5Prof. Doutora, Centro Multidisciplinar da Universidade Federal do Acre, Campus Floresta (Rua Estrada da Canela Fina, KM 12 Gleba Formoso - São Francisco, 69.895-000, Cruzeiro do Sul/AC). E-mail: [email protected]. 1 RESUMO O déficit hídrico associada ao estresse salino afetam a produtividade das culturas agrícolas. Objetivou-se avaliar a produtividade da cultura de amendoim irrigado com água de baixa e alta salinidade submetida a diferentes intervalos de supressão. O experimento foi conduzido em condições de campo, no período de agosto a outubro de 2019 na Fazenda Experimental de Piroás, Redenção-CE. O delineamento experimental utilizado foi o de blocos ao acaso em arranjo fatorial, sendo o primeiro fator a salinidade das águas de irrigação (1,0 e 4,0 dS m-¹) e o segundo fator, quatro intervalos de supressões (IS1= 40 a 55 DAS; IS2 = 55 a 70 DAS; IS3 = 70 a 85 DAS e IS4 = sem intervalos de supressão), com quatro repetições. Foram avaliadas as seguintes variáveis: número, massa, comprimento e diâmetro de vagem e a produtividade. O tratamento sem intervalo de supressão hídrica associado a água de menor salinidade proporcionam maior número e diâmetro de vagem. A água de maior salinidade afeta a massa e comprimento de vagem. A utilização da água de maior ou menor salinidade sem intervalo de supressão da irrigação proporciona maior produtividade da cultura do amendoim. PALAVRAS CHAVES: Arachis hypogaea L., déficit hídrico, estresse salino GOES, G. F.; SOUSA, G. G.; SANTOS, S. O.; SILVA JUNIOR, F. B.; CEITA, E. A. R.; LEITE, K. N.PEANUT CULTURE YIELD UNDER DIFFERENT SALT WATER IRRIGATION SUPPRESSIONS 2 ABSTRACT The water deficit associated with salt stress affects the productivity of agricultural crops. The objective was to evaluate the productivity of peanut culture irrigated with low and high salinity water submitted to different suppression intervals. The experiment was conducted under field conditions, from August to October 2019 at the Experimental Farm of Piroás, Redenção-CE. The experimental design used for the randomized blocks in a factorial arrangement, with the first factor is the salinity of the irrigation water (1.0 and 4.0 dS m-¹) and the second factor, four suppression intervals (IS1 = 40 a 55 DAS; IS2 = 55 to 70 DAS; IS3 = 70 to 85 DAS and IS4 = without suppression intervals), with four repetitions. The following variables were evaluated: number, mass, pod length and diameter and yield. Treatment without water suppression interval associated with less saline water provides a greater number and diameter of pods. Higher salinity water affects pod mass and length. The use of water of greater or lesser salinity without interval of suppression of irrigation offers the highest yield of the peanut culture. Keywords: Arachis hypogaea L., water déficit, saline stress.

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Foliar application of H2O2 as salt stress attenuator in ‘BRS Rubi do Cerrado’ sour passion fruit

Semina Ciências Agrárias ◽

10.5433/1679-0359.2021v42n4p2253 ◽

2021 ◽

Vol 42 (4) ◽

pp. 2253-2270

Author(s):

Jailton Garcia Ramos ◽

◽

Geovani Soares de Lima ◽

Vera Lucia Antunes de Lima ◽

Francisco Jean da Silva Paiva ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Salt Stress ◽

Gas Exchange ◽

Foliar Application ◽

Saline Water ◽

Intercellular Co2 Concentration ◽

Co2 Concentration ◽

Passion Fruit ◽

Water Salinity ◽

Sour Passion Fruit

Irrigation with saline water causes a reduction in yield, especially in semi-arid regions. Cultivation strategies have been developed to mitigate salt stress on plants, such as the use of hydrogen peroxide. The objective of this study was to evaluate the attenuating effect of hydrogen peroxide on the gas exchange and growth of ‘BRS Rubi do Cerrado’ sour passion fruit cultivated under irrigation with saline water. The design was completely randomized in split-plot plots, with water salinity levels ECw (0.6, 1.2, 1.8, 2.4, and 3.0 dS m-1) considered the plots and the concentrations of hydrogen peroxide H2O2 (0, 15, 30, and 45 μM) considered the subplots, with three replicates. Gas exchange (stomatal conductance, transpiration, CO2 assimilation rate, intercellular CO2 concentration, instantaneous water use efficiency, and instantaneous carboxylation efficiency), and absolute and relative growth rates in stem diameter were evaluated. An increase in irrigation water salinity from 0.6 dS m-1 reduced gas exchange, and exogenous application of hydrogen peroxide did not promote a significant effect on gas exchange. However, foliar application of hydrogen peroxide at 15 μM increased the growth of ‘BRS Rubi do Cerrado’ sour passion fruit.

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Growth and Development of Passion Fruit Seedlings under Irrigation with Salt Water and Biofertilizer

Journal of Experimental Agriculture International ◽

10.9734/jeai/2019/v40i230360 ◽

2019 ◽

pp. 1-13

Author(s):

Francisco De Oliveira Mesquita ◽

Patricya Lorenna De Brito Rodrigues ◽

Ana Célia Maia Meireles ◽

José Leonardo Noronha Cardoso ◽

Thiago De Souza Ribeiro ◽

...

Keyword(s):

Irrigation Water ◽

Growth And Development ◽

Saline Water ◽

Salt Water ◽

Passion Fruit ◽

Seedling Production ◽

Randomized Design ◽

Irrigation Water Salinity ◽

Completely Randomized Design ◽

Yellow Passion Fruit

The yellow passion fruit is a plant climbing botanically that has a good geographical distribution in Brazil, with more than 150 species in the country. The presence of salts in soil and irrigation water is one of the main obstacles in agriculture in the world, caused by low rainfall and high evapotranspirative rates causing the salts to accumulate in the soil. However, alternatives have been sought to try to mitigate such limitations of seedling production, such as the use of biofertilizers in the soil. In this way, the objective was to evaluate the growth and development of yellow passion fruit seedlings under the effects of irrigation water salinity and the use of bovine biofertilizer on the substrate. An experiment was carried out in a greenhouse in the Center for Agrarian Sciences and Biodiversity, from october/2017 tomarch/2018, in county of Crato-Ceara, Brazil. The substrate used was the first 20 cm material of a yellow Red Argisol. The experimental design was completely randomized design (C.R.D) in a factorial scheme 5x2, referring to the electrical conductivity values of the irrigation water: 0.5; 1.0; 2.0; 3.0 and 4.0 dS m-1, in the soil without and with common biofertilizer, with three replicates. The biofertilizer, after being diluted in non-saline water (0.5 dS m-1) in the ratio of 1:3, was applied only once to 10% of the substrate volume two days before sowing. The increase in the salinity of irrigation water negatively affected the initial behavior of the passion fruit seedlings in terms of growth and development, especially in the treatments that did not receive the organic feed.

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Gas exchange, growth, and quality of passion fruit seedlings cultivated with saline water

Semina Ciências Agrárias ◽

10.5433/1679-0359.2021v42n1p137 ◽

2021 ◽

Vol 42 (1) ◽

pp. 137-154

Author(s):

Geovani Soares de Lima ◽

◽

José Nathanael Ferreira de Andrade ◽

Mizael Nabor Vaz de Medeiros ◽

Lauriane Almeida dos Anjos Soares ◽

...

Keyword(s):

Gas Exchange ◽

Saline Water ◽

Block Design ◽

Intercellular Co2 Concentration ◽

Relative Yield ◽

Co2 Concentration ◽

Co2 Assimilation ◽

Passion Fruit ◽

Water Salinity

This study was conducted to evaluate the gas exchange, growth, and quality of passion fruit cultivars under irrigation with waters of different salinity levels. The experiment was conducted in a greenhouse, in Pombal-PB, Brazil, using a randomized block design in a 5 ? 2 factorial arrangement, with five levels of electrical conductivity of irrigation water (0.3, 1.1, 1.9, 2.7, and 3.5 dS m-1) and two passion fruit cultivars (BRS Sol do Cerrado and Guinezinho), with three plants per plot and four replicates. The reduction in transpiration, intercellular CO2 concentration and CO2 assimilation rate in passion fruit plants grown with saline water was related to factors of stomatal and non-stomatal origin. Gas exchange and growth of passion fruit cultivars were negatively affected by water salinity from 0.3 dS m-1 at 75 days after sowing. Despite the reduction in the growth of the passion fruit cultivars, irrigation with water of up to 3.5 dS m-1 could be used to obtain seedlings with acceptable quality. Based on the relative yield of total dry phytomass, the passion fruit cultivars BRS Sol do Cerrado and Guinezinho were classified as moderately sensitive to water salinity during the seedling phase.

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PRODUÇÃO DO MARACUJAZEIRO-AMARELO IRRIGADO COM ÁGUA SALINA EM COVAS PROTEGIDAS CONTRA PERDAS HÍDRICAS

Irriga ◽

10.15809/irriga.2005v10n3p229-240 ◽

2005 ◽

Vol 10 (3) ◽

pp. 229-240 ◽

Cited By ~ 3

Author(s):

Lourival Ferreira Cavalcante ◽

José Ronaldo Medeiros Costa ◽

Fernando Kidelmar Dantas de Oliveira ◽

Italo Helbert Lucena Cavalcante ◽

Fernanda Aspazia Rodrigues de Araújo

Keyword(s):

Arid Zone ◽

Saline Water ◽

Irrigation System ◽

Rio Grande ◽

Fruit Production ◽

Passion Fruit ◽

Santa Cruz ◽

Passiflora Edulis ◽

High Salinity Water ◽

Yellow Passion Fruit

PRODUÇÃO DO MARACUJAZEIRO-AMARELO IRRIGADO COM ÁGUA SALINA EM COVAS PROTEGIDAS CONTRA PERDAS HÍDRICAS Lourival Ferreira Cavalcante1; José Ronaldo Medeiros Costa2; Fernando Kidelmar Dantas de Oliveira3; Ítalo Herbert Lucena Cavalcante4; Fernanda Aspazia Rodrigues de Araújo21DSER/CCA/Universidade Federal da Paraiba, Areia, PB, [email protected]/ Universidade Federal da Paraiba, Areia-PB3Prodesiano/Banco do Nordeste do Brasil, Santa Cruz – RN4Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Jaboticabal, SP 1 RESUMO Um experimento de campo foi conduzido no município de Santa Cruz, zona semi-árida do Rio Grande do Norte, para avaliar o comportamento produtivo do maracujazeiro-amarelo, Passiflora edulis f. flavicarpa Deg., e a salinidade do solo irrigados com água salina. Os tratamentos foram dispostos em blocos casualizados, com quatro repetições e 15 plantas por parcela, em esquema fatorial 5 x 2, referente ao revestimento das faces laterais das covas com filme de polietileno (0, 1, 2, 3 e 4 faces), irrigadas diariamente por gotejamento com 5 e 10 litros de água de condutividade elétrica 3,2 dSm-1, do tipo C4S3, fortemente salina. O plantio foi feito no espaçamento de 2m entre linhas e 4m nas linhas, usando espaldeira com um arame liso nº 12 instalado a 2m de altura. A interação volumes de água x revestimento das covas não exerceu efeito significativo sobre nenhuma das variáveis estudadas, mas o revestimento das faces laterais das covas com filme de polietileno contribuiu para o aumento do número de frutos colhidos, produção por planta, e manteve o solo mais úmido e com menor índice de salinidade. UNITERMOS: Irrigação, Passiflora, sistema de produção. CAVALCANTE, L. F.; COSTA, J. R. M.; OLIVEIRA, F. K. D.; CAVALCANTE, I. H. L.; ARAUJO, F. A. R. YELLOW PASSION FRUIT PRODUCTION IRRIGATED WITH SALINE WATER IN COVERED HOLES TO REDUCE WATER LOSS 2 ABSTRACT This study aimed to evaluate the production of yellow passion fruit plants, Passiflora edulis f. flavicarpa Deg., and the soil salinity when irrigated with saline water. The experiment was carried out in Santa Cruz, located in the semi arid zone of the state of Rio Grande do Norte, Brazil. The treatments were distributed in randomized blocks, with four replications and 15 plants in each plot, using a factorial design 5 x 2, which referred to the lateral covered cave with polyethylene film (0, 1, 2, 3 and 4 sides). The plants were irrigated daily using a drip irrigation system with 5 and 10 liters of high salinity water and electrical conductivity of 3.2 dSm-1. Planting distances were 2m between lines and 4m between plants, using number 12 flat wire shoulder-piece at the height of 2m. Lateral cave covering had a positive effect on fruit number, production by plant and yield of yellow passion fruit and contributed to keep the soil the more humid and with lower salinity rate.. KEYWORDS: Irrigation, Passiflora, production system.

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Production of Seedlings of Yellow Passion Fruit Plant in Different Substrates and Saline Levels

Journal of Agricultural Science ◽

10.5539/jas.v10n9p244 ◽

2018 ◽

Vol 10 (9) ◽

pp. 244

Author(s):

Camile Dutra Lourenço Gomes ◽

Jolinda Mércia de Sá ◽

Erllan Tavares Costa Leitão ◽

Marilia Hortência Batista Silva Rodrigues ◽

Valeria Fernandes de Oliveira Sousa ◽

...

Keyword(s):

Irrigation Water ◽

Block Design ◽

Harmful Effect ◽

Passion Fruit ◽

Saline Stress ◽

Randomized Block Design ◽

Plant Experiment ◽

Nutritional Needs ◽

Goat Manure ◽

Yellow Passion Fruit

In the process of production of seedlings the formulation of substrates that supply the nutritional needs and make available appropriate humidity tenor is relevant for the success and the reduction of costs of the producing with other inputs. In this perspective, it is known that alternative substrates are rich in organic matter, which possesses extenuating action for the harmful effect of the salinity. Therefore, it was aimed at to evaluate the effect of saline waters and formulations of substrates in the production of seedlings of yellow passion fruit plant. Experiment was driven in atmosphere protected in the dependences of the Federal University of Campina Grande, Pombal, Paraíba. The randomized block design was used in factorial outline 5 × 5, being five levels of salinity of the irrigation water (0.3; 1.3; 2.3; 3.3 and 4.3 dS m-1) and five substrates: S1 = soil; S2 = soil, goat manure and bovine manure (1:1:1); S3 = soil and goat manure (3:1); S4 = soil and bovine manure (3:1); S5 = soil, goat manure and bovine manure (3:0.5:0.5). To the 52 days after the sowing the growth analyses and quality of the seedlings were checked. The growth of the passion fruit plant seedlings was inhibited by the salinity in the irrigation water. However, the use of organic inputs in the formulation of the substratum lessens the harmful effect of the saline stress, being the best substratum, soil and bovid manure in the proportion 3:1.

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POTASSIUM DOES NOT ATTENUATE SALT STRESS IN YELLOW PASSION FRUIT UNDER IRRIGATION MANAGEMENT STRATEGIES

Revista Caatinga ◽

10.1590/1983-21252020v33n423rc ◽

2020 ◽

Vol 33 (4) ◽

pp. 1082-1091

Author(s):

GEOVANI SOARES DE LIMA ◽

JAILSON BATISTA DA SILVA ◽

FRANCISCO WESLEY ALVES PINHEIRO ◽

LAURIANE ALMEIDA DOS ANJOS SOARES ◽

HANS RAJ GHEYI

Keyword(s):

Saline Water ◽

Irrigation Management ◽

Management Strategies ◽

Passion Fruit ◽

High Salinity Water ◽

Low Salinity ◽

Low Salinity Water ◽

Fruiting Stage ◽

Salinity Water ◽

Yellow Passion Fruit

ABSTRACT The objective of this study was to evaluate the gas exchange, growth and production of yellow passion fruit cv. BRS GA1, as a function of irrigation management strategies with saline water and potassium doses. The experiment was conducted under field conditions in São Domingos, PB, Brazil. A randomized block design was used in a 6 * 2 factorial scheme. The treatments consisted of six strategies of irrigation with saline waters (irrigation with low-salinity water throughout the crop cycle - SE; irrigation with high-salinity water in the vegetative stage - VE; flowering stage - FL; fruiting stage - FR; in the successive vegetative/flowering stages - VE/FL; vegetative/fruiting stages - VE/FR) and two doses of potassium (100 and 130% of the K2O recommendation), with four replicates and four plants per plot. The 100% dose corresponded to 60 g of K 2O plant-1 year-1. The effects of using high-salinity water (3.2 dS m-1) alternated with low-salinity water (1.3 dS m-1) were evaluated in different stages of the cultivation cycle. Irrigation with saline water in the fruiting stage promoted an increase in intercellular CO2 concentration and decrease in CO2 assimilation, with effects of non-stomatal origin standing out as limiting factors of photosynthetic efficiency. The highest CO 2 assimilation rate in plants subjected to water salinity of 1.3 dS m-1 throughout the cycle resulted in increments in the number of fruits and in the production per plant of the passion fruit cv. BRS GA1.

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