Phosphorus doses alter the ionic homeostasis of cowpea irrigated with saline water

HIGHLIGHTS Irrigation using water with electrical conductivity above 2.5 dS m-1 is not adequate for ‘Paulistinha’ cowpea. Increment in phosphorus dose does not increase phosphorus content in cowpea plant. Under salt stress conditions, cowpea plants require lower doses of phosphorus.

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Formation of ‘Crioula’ guava rootstock under saline water irrigation and nitrogen doses

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v20n8p739-745 ◽

2016 ◽

Vol 20 (8) ◽

pp. 739-745 ◽

Cited By ~ 4

Author(s):

Leandro de P. Souza ◽

Reginaldo G. Nobre ◽

Evandro M. da Silva ◽

Geovani S. de Lima ◽

Francisco W. A. Pinheiro ◽

...

Keyword(s):

Electrical Conductivity ◽

Salt Stress ◽

Experimental Design ◽

Deleterious Effect ◽

Saline Water ◽

Dry Weight ◽

Saline Water Irrigation ◽

N Dose

ABSTRACT The objective of this research was to evaluate the growth and formation of fresh and dry weight of ‘Crioula’ guava rootstock irrigated with waters of different saline levels and nitrogen (N) doses, in an experiment conducted in plastic tubes under greenhouse conditions. The experimental design was randomized blocks, in a 5 x 4 factorial scheme with four replicates, and the treatments consisted of five levels of water electrical conductivity - ECw (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the cultivation of guava seedlings, cv. ‘Paluma’). The dose referring to 100% corresponds to 773 mg of N dm-3. The highest growth of ‘Crioula’ guava rootstock was obtained with ECw of 0.3 dS m-1 and fertilization of 541.1 mg N dm-3 of soil; increasing N doses did not reduce the deleterious effect of the salt stress on the growth and phytomass formation of ‘Crioula’ guava rootstock; irrigation with water of up to 1.75 dS m-1, in the production of guava rootstocks, promotes acceptable reduction of 10% in growth and quality of the seedlings.

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SALICYLIC ACID AS AN ATTENUATOR OF SALT STRESS IN SOURSOP

Revista Caatinga ◽

10.1590/1983-21252020v33n424rc ◽

2020 ◽

Vol 33 (4) ◽

pp. 1092-1101

Author(s):

ANDRÉ ALISSON RODRIGUES DA SILVA ◽

GEOVANI SOARES DE LIMA ◽

CARLOS ALBERTO VIEIRA DE AZEVEDO ◽

LUANA LUCAS DE SÁ ALMEIDA VELOSO ◽

HANS RAJ GHEYI

Keyword(s):

Electrical Conductivity ◽

Salicylic Acid ◽

Salt Stress ◽

Stomatal Conductance ◽

Gas Exchange ◽

Irrigation Water ◽

Saline Water ◽

Stress Effects ◽

Saline Waters ◽

Induced Tolerance

ABSTRACT The search for alternatives that enable the use of saline waters in agriculture has become constant. In this context, the objective was to evaluate the effects of salicylic acid in mitigating salt stress effects on the growth and gas exchange of soursop cv. ‘Morada Nova’. The study was conducted in a greenhouse, in the municipality of Campina Grande - PB, Brazil. Treatments were distributed in randomized blocks, in a 5 x 4 factorial arrangement, corresponding to five levels of electrical conductivity of irrigation water - ECw (0.8; 1.6; 2.4; 3.2 and 4.0 dS m-1) and four concentrations of salicylic acid - SA (0; 1.2; 2.4 and 3.6 mM), with three replicates. Irrigation with saline water compromised the growth and gas exchange of soursop cv. ‘Morada Nova’. However, exogenous application of salicylic acid induced tolerance to salt stress in soursop plants, as their growth, transpiration, stomatal conductance, photosynthesis and instantaneous carboxylation efficiency were favored by the application of salicylic acid, even when exposed to water salinity.

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Gas exchanges and growth of passion fruit seedlings under salt stress and hydrogen peroxide1

Pesquisa Agropecuária Tropical ◽

10.1590/1983-40632019v4955671 ◽

2019 ◽

Vol 49 ◽

Author(s):

André Alisson Rodrigues da Silva ◽

Geovani Soares de Lima ◽

Carlos Alberto Vieira de Azevedo ◽

Hans Raj Gheyi ◽

Leandro de Pádua Souza ◽

...

Keyword(s):

Electrical Conductivity ◽

Hydrogen Peroxide ◽

Salt Stress ◽

Leaf Area ◽

Irrigation Water ◽

Saline Water ◽

Block Design ◽

Passion Fruit ◽

Saline Stress ◽

Gas Exchanges

ABSTRACT The semi-arid region of the Brazilian Northeast has adequate edaphoclimatic conditions for the passion fruit production, but the water used for irrigation commonly has high concentrations of salts that are harmful to the plant growth and development. A previous supply of hydrogen peroxide induces the acclimation of plants under saline stress conditions, reducing deleterious effects on their growth and physiology. This study aimed to evaluate the gas exchanges and growth of passion fruit as a function of irrigation with saline water and exogenous application of hydrogen peroxide. The experiment was carried out under greenhouse conditions, using a randomized block design, in a 4 x 4 factorial arrangement, being four levels of irrigation water electrical conductivity (0.7 dS m-1, 1.4 dS m-1, 2.1 dS m-1 and 2.8 dS m-1) and four hydrogen peroxide concentrations (0 µM, 25 µM, 50 µM and 75 µM), with four replicates and two plants per plot. The hydrogen peroxide application attenuated the deleterious effects of the irrigation water salinity on transpiration, CO2 assimilation rate, internal carbon concentration, plant height and leaf area of yellow passion fruit, at 60 days after sowing, with the concentration of 25 µM being the most efficient. Irrigation using water with electrical conductivity above 0.7 dS m-1 negatively affects the gas exchanges and growth of passion fruit, being the stomatal conductance and leaf area the most sensitive variables to the salt stress.

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Salt water and silicon application on growth, chloroplastid pigments, chlorophyll fluorescence and beet production

Revista Colombiana de Ciencias Hortícolas ◽

10.17584/rcch.2019v13i3.8489 ◽

2019 ◽

Vol 13 (3) ◽

pp. 406-415

Author(s):

José Sebastião de Melo-Filho ◽

Toshik Iarley da Silva ◽

Anderson Carlos De Melo Gonçalves ◽

Leonardo Vieira de Sousa ◽

Mario Leno Martins Véras ◽

...

Keyword(s):

Electrical Conductivity ◽

Salt Stress ◽

Chlorophyll Fluorescence ◽

Irrigation Water ◽

Saline Water ◽

Salt Water ◽

Harmful Effect ◽

Water Usage ◽

Chlorophyll Contents ◽

Central Composite

In recent years, the use of saline water in agriculture has become an alternative mainly because of water scarcity. However, plants do not tolerate high salt contents; so, the use of salt stress attenuators could enable saline water usage in agriculture. This study aimed to assess the effect of saline water and silicon applications on growth, chloroplastid pigments, chlorophyll fluorescence a and beet production. The experiment was conducted with complete randomized blocks in a 5 x 5 combined factorial arrangement according to the Central Composite of Box experiment matrix for the electrical conductivity in the irrigation water (ECw) and silicon doses (Si), with minimum (- α) and maximum (α) values from 0.5 to 6.0 dS m-1 and from 0.00 to 18.16 mL L-1, totaling nine treatments, with four replicates and three plants per plot. The irrigation water ECw increase reduced growth and beet production, but the chlorophyll contents, biomass and fluorescence production were not affected by salinity. Silicon applications via the soil increased growth and chlorophyll fluorescence a but did not reduce the harmful effect of the salt stress. The irrigation water ECw above 0.50 dS m-1 negatively affected the beet crop. The silicon dose of 9.08 mL L-1 is the most recommended application.

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Ionic homeostasis, biochemical components and yield of Italian zucchini under nitrogen forms and salt stress

Brazilian Journal of Biology ◽

10.1590/1519-6984.233567 ◽

2022 ◽

Vol 82 ◽

Author(s):

C. S. Fernandes ◽

F. V. S. Sá ◽

M. Ferreira Neto ◽

N. S. Dias ◽

L. B. L Reges ◽

...

Keyword(s):

Electrical Conductivity ◽

Salt Stress ◽

Experimental Design ◽

Irrigation Water ◽

Nutrient Accumulation ◽

Nitrogen Forms ◽

Ammonium Ions ◽

Ionic Homeostasis ◽

Hydroponic System ◽

Biochemical Components

Abstract This research was carried out aiming at evaluating the effects of nitrate and ammonium ions on nutrient accumulation, biochemical components and yield of Italian zucchini (cv. Caserta) grown in a hydroponic system under salt stress conditions. The experiment was carried out in a greenhouse utilizing an experimental design in randomized blocks, arranged in a 2 x 5 factorial scheme, with 4 replications. The treatments consisted of two forms of nitrogen (nitrate - NO3- and ammonium - NH4+) and 5 electrical conductivity levels of irrigation water (ECw) (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1). The analysis of the results indicated that supply of N exclusively in NH4+ form promotes greater damage to the leaf membrane and reduction in accumulation of macronutrients and higher Na+/K+, Na+/Ca++ and Na+/Mg++ ratios in the shoots of zucchini plants. Electrical conductivity of irrigation water above 2.0 dS m-1 reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant. The toxicity of NH4+ under Italian zucchini plants overlap the toxicity of the salinity, since its fertilization exclusively with this form of nitrogen inhibits its production, being the NO3- form the most suitable for the cultivation of the species.

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