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

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.

scholarly journals GAS EXCHANGE, CHLOROPLAST PIGMENTS AND GROWTH OF PASSION FRUIT CULTIVATED WITH SALINE WATER AND POTASSIUM FERTILIZATION 1

2020 ◽  
Vol 33 (1) ◽  
pp. 184-194
Author(s):  
GEOVANI SOARES DE LIMA ◽  
COSMO GUSTAVO JACOME FERNANDES ◽  
LAURIANE ALMEIDA DOS ANJOS SOARES ◽  
HANS RAJ GHEYI ◽  
PEDRO DANTAS FERNANDES
Keyword(s):  
Gas Exchange ◽  
Saline Water ◽  
Block Design ◽  
Co2 Assimilation ◽  
Passion Fruit ◽  
Water Salinity ◽  
Chloroplast Pigments ◽  
Potassium Fertilization ◽  
Randomized Block Design ◽  
Fruit Plants

ABSTRACT The objective of this study was to evaluate the gas exchange, chloroplast pigments and growth of ‘BRS Rubi do Cerrado’ passion fruit as a function of irrigation with saline water and potassium fertilization in the seedling formation stage. The experiment was conducted under greenhouse conditions in the municipality of Pombal-PB, Brazil. A randomized block design was used in 5 x 2 factorial scheme, corresponding to five levels of water electrical conductivity - ECw (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and two doses of potassium - KD (50 and 100% of the recommendation), with four replicates and two plants per plot. Water salinity from 0.3 dS m-1 reduced the stomatal opening, transpiration, CO2 assimilation and inhibited the growth of ‘BRS Rubi do Cerrado’ passion fruit plants, at 40 days after sowing. There was no CO2 restriction in the substomatal cavity of passion fruit plants grown under water salinity from 0.3 dS m-1. Potassium dose of 150 mg kg-1 of soil, corresponding to 100%, intensified the effect of salt stress on the assimilation rate and instantaneous carboxylation efficiency in 'BRS Rubi do Cerrado' passion fruit. There was interaction between water salinity levels and potassium doses for the chlorophyll a and b contents of 'BRS Rubi do Cerrado' passion fruit.

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

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.

scholarly journals Gas exchange, growth, and production of mini-watermelon under saline water irrigation and phosphate fertilization

2020 ◽  
Vol 41 (6supl2) ◽  
pp. 3039-3052
Author(s):  
Geovani Soares de Lima ◽  
◽  
Charles Macedo Félix ◽  
Saulo Soares da Silva ◽  
Lauriane Almeida dos Anjos Soares ◽  
...  
Keyword(s):  
Salt Stress ◽  
Gas Exchange ◽  
Saline Water ◽  
Block Design ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Co2 Assimilation ◽  
Northeastern Brazil ◽  
Randomized Block Design ◽  
Semi Arid Region

In the semi-arid region of Northeastern Brazil, due to the occurrence of excess salts, both in the water and soil, plants are constantly exposed to various conditions of abiotic stress. Thus, it is extremely important to identify methods capable of minimizing the effects of salt stress on plants as a way to ensure the expansion of irrigated areas. In this context, the objective of this study was to evaluate the gas exchange, growth, and production of mini-watermelon irrigated with saline waters and fertilized with phosphorus. The experiment was conducted in pots under greenhouse conditions in Pombal, PB, Brazil, using a randomized block design in a 5 x 4 factorial scheme, corresponding to five levels of electrical conductivity of irrigation water—ECw (0.3, 1.3, 2.3, 3.3, and 4.3 dS m-1), four phosphorus doses— PD (60, 80, 100, and 120% of the recommendation), and with three replicates. Watermelon plants cv. Sugar Baby were sensitive to water salinity greater than 0.3 dS m-1, with more pronounced inhibition of gas exchange, growth, and production. Reduction in the CO2 assimilation rate of watermelon plants cv. Sugar Baby was associated with factors of stomatal and non-stomatal origin. Phosphorous doses corresponding to 73 and 88% of the recommended values promoted an increase in the intercellular CO2 concentration and stem diameter of mini-watermelon plants. P2O5 doses ranging from 60 to 120% of the recommendation did not mitigate the effects of salt stress on the cultivation of watermelon cv. Sugar Baby.

scholarly journals Physiological alterations and production of guava under water salinity and nitrogen fertilizer application

2018 ◽  
Vol 39 (5) ◽  
pp. 1945 ◽  
Author(s):  
Idelfonso Leandro Bezerra ◽  
Hans Raj Gheyi ◽  
Reginaldo Gomes Nobre ◽  
Joicy Lima Barbosa ◽  
Reynaldo Teodoro de Fátima ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Transpiration Rate ◽  
Saline Water ◽  
Co2 Concentration ◽  
Fertilizer Application ◽  
Co2 Assimilation ◽  
Fruit Weight ◽  
Water Salinity ◽  
Physiological Variables ◽  
Equatorial Diameter

Adequate management of saline water irrigation and nitrogen (N) fertilizer application in agriculture can contribute substantially to expanding guava cultivation in the semi-arid region of Northeast Brazil. This study aimed to evaluate gas exchange and production of ‘Paluma’ guava cultivated with different levels of water salinity and N. The experiment was carried out in drainage lysimeters under field conditions in an experimental area of the Federal University of Campina Grande (UFCG), Campus of Pombal, PB, Brazil. The experimental design was randomized blocks, in a 5 × 4 factorial scheme, with five levels of water salinity – ECw (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four doses of N (70, 100, 130 and 160% of the recommendation) with three replicates. The dose relative to 100% corresponded to 541.1 mg of N dm-3 of soil. The following production components were evaluated: number of fruits, mean fruit weight, polar and equatorial diameter of fruits, and polar diameter/equatorial diameter ratio. In addition, the following physiological variables were evaluated at 180 days after fruit pruning: stomatal conductance, CO2 assimilation rate, internal CO2 concentration and transpiration rate. CO2 assimilation and transpiration rate were used to calculate instantaneous water use efficiency. The interaction between water salinity and N doses did not cause significant effects on any variable studied. Irrigation water salinity above 0.3 dS m-1 hampered gas exchange at 180 days after fruit pruning and negatively affected production components.

scholarly journals PHYSIOLOGICAL INDICES AND GROWTH OF ‘PALUMA’ GUAVA UNDER SALINE WATER IRRIGATION AND NITROGEN FERTIGATION

2018 ◽  
Vol 31 (4) ◽  
pp. 808-816
Author(s):  
Idelfonso Leandro Bezerra ◽  
Reginaldo Gomes Nobre ◽  
Hans Raj Gheyi ◽  
Geovani Soares De Lima ◽  
Joicy Lima Barbosa
Keyword(s):  
Irrigation Water ◽  
Saline Water ◽  
Block Design ◽  
Co2 Concentration ◽  
Co2 Assimilation ◽  
N Fertilization ◽  
Water Salinity ◽  
Relative Growth Rates ◽  
Randomized Block Design ◽  
Irrigation Water Salinity

ABSTRACT The cultivation of irrigated guava in semi-arid areas highlights the need for information regarding its responses to irrigation water quality and the fertilization management that enables its exploitation. Thus, this study aimed to evaluate the effect of water salinity and nitrogen (N) doses on the growth and physiology of the guava cv. ‘Paluma’. The experiments was conducted in drainage lysimeters under field conditions in an experimental area at the Center of Sciences and Agri-Food Technology of the Federal University of Campina Grande (CCTA/UFCG), Campus II, in Pombal, PB, Brazil. The experiment had a randomized block design, and treatments consisted of a 5 x 4 factorial arrangement corresponding to five levels of irrigation 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 recommended N dose). The 100% dose corresponded to 541.1 mg of N dm-3 of soil. Increments in irrigation water salinity from 0.3 dS m-1 led to a reduction in stomatal conductance, internal CO2 concentration, CO2 assimilation rate, transpiration, instantaneous water use efficiency, the number of leaves and branches, stem diameter, and absolute and relative growth rates. Nitrogen doses ranging from 378.7 to 865.7 mg of N dm-3 of soil did not affect gas exchange and plant growth. Although ‘Paluma’ guava growth was affected by increases in water salinity, these plants can be irrigated using water of up to 1.42 dS m-1 with an acceptable reduction of 10% in growth variables. The interaction between irrigation water salinity and N fertilization had no significant effect on any of the variables studied.

scholarly journals GAS EXCHANGE AND PRODUCTION OF PASSION FRUIT AS AFFECTED BY CATIONIC NATURE OF IRRIGATION WATER1

2021 ◽  
Vol 34 (4) ◽  
pp. 926-936
Author(s):  
FRANCISCO JEAN DA SILVA PAIVA ◽  
GEOVANI SOARES DE LIMA ◽  
VERA LÚCIA ANTUNES DE LIMA ◽  
KHEILA GOMES NUNES ◽  
PEDRO DANTAS FERNANDES
Keyword(s):  
Gas Exchange ◽  
Block Design ◽  
Passion Fruit ◽  
Water Salinity ◽  
Control Treatment ◽  
Fruit Species ◽  
Randomized Block Design ◽  
Semi Arid ◽  
Yellow Passion Fruit

ABSTRACT Yellow passion fruit is a fruit species widely cultivated throughout the Brazilian semi-arid territory, but its yield is affected by the quality of the waters of this region. In this context, the objective was to evaluate the gas exchange and production of passion fruit cv. BRS Rubi do Cerrado irrigated with waters of different cationic natures. The study was conducted in drainage lysimeters under greenhouse conditions in Campina Grande, PB, Brazil, in a randomized block design, and the treatments were eight cationic natures of irrigation water (S1 - Control; S2 - Na+; S3 - Ca2+; S4 - Mg2+; S5 - Na+ + Ca2+; S6 - Na+ + Mg2+; S7 - Ca2+ + Mg2+ and S8 - Na+ + Ca2+ + Mg2+) with three replicates. Plants in the control treatment were irrigated with water of low electrical conductivity (ECw = 0.4 dS m-1), while those of the other treatments were irrigated using water with ECw of 3.5 dS m-1. The treatments Na+ + Ca2+, Na+ + Mg2+ and Ca2+ + Mg2+ were prepared in the equivalent ratio of 1:1, and Na++Ca2++Mg2+ in the ratio 7:2:1, respectively. Water salinity of 3.5 dS m-1 reduced gas exchange, and stomatal conductance and transpiration were the most sensitive variables of passion fruit. The number of fruits of passion fruit cv. BRS Rubi do Cerrado decreased with water salinity, regardless of the cationic nature. The waters of calcic and calcic+magnesian nature caused the greatest deleterious effects on the production variables of passion fruit, at 259 days after transplanting.

scholarly journals Salt stress on physiology, biometry and fruit quality of grafted Passiflora edulis

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Regiana Dos Santos Moura ◽  
Hans Raj Gheyi ◽  
Everaldo Moreira Da Silva ◽  
Elisson de Araújo Dias ◽  
Caliane Silva Da Cruz ◽  
...  
Keyword(s):  
Salt Stress ◽  
Fruit Quality ◽  
Titratable Acidity ◽  
Co2 Concentration ◽  
Co2 Assimilation ◽  
Soluble Solids ◽  
Water Salinity ◽  
Physiological Variables ◽  
Number Of Leaves

The production of grafted passion fruit is an alternative for plant adaptation to saline environments. The objective of this study was to evaluate the effect of salt stress on physiology, biometry and fruit quality of P. edulis grafted on Passiflora spp. The experiment was conducted in completely randomized design, in a 3 x 2 factorial scheme, corresponding to three species of Passiflora (P. edulis, P. gibertii and P. cincinnata) with P. edulis scion and two levels of irrigation water salinity (0.5 - control and 4.5 dS m-1), with four repetitions. Water salinity compromises gas exchanges (CO2 assimilation raste and transpiration) and physiological variables (total chlorophyll and total water consumption) in grafted P. edulis. The interaction between the factors (water salinity x species) compromised only the growth in plant height and number of leaves. In relation to the species, auto-grafted P. edulis stood out from the other species, with higher internal CO2 concentration, number of leaves, stem dry mass, peel thickness, total soluble solids (TSS) of the pulp and TSS/TA ratio (titratable acidity). Auto-grafted P. edulis under saline conditions develops vital mechanisms (TSS and TSS/TA), which attenuates the effects of salt stress on the physico-chemical quality of the fruits.

scholarly journals Gas exchanges and growth of passion fruit under saline water irrigation and H2O2 application

2019 ◽  
Vol 23 (12) ◽  
pp. 945-951 ◽  
Author(s):  
Elysson M. G. Andrade ◽  
Geovani S. de Lima ◽  
Vera L. A. de Lima ◽  
Saulo S. da Silva ◽  
Hans R. Gheyi ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Irrigation Water ◽  
Saline Water ◽  
Co2 Assimilation ◽  
Passion Fruit ◽  
Water Salinity ◽  
Gas Exchanges ◽  
Irrigation Water Salinity ◽  
Number Of Leaves ◽  
Yellow Passion Fruit

ABSTRACT The study was carried out to evaluate the photosynthetic efficiency and growth of yellow passion fruit, cultivated under different levels of irrigation water salinity and exogenous application of hydrogen peroxide. The experiment was carried out in greenhouse of the Universidade Federal de Campina Grande, PB, Brazil, using drainage lysimeters with capacity for 100 dm3, filled with Entisol of sandy texture. The experimental design was randomized blocks using a 4 x 4 factorial scheme, with three repetitions, corresponding to four water salinity (0.7; 1.4; 2.1 and 2.8 dS m-1) and four concentrations of hydrogen peroxide (0, 20, 40 and 60 µM). The different concentrations of hydrogen peroxide were applied by soaking the seed for a period of 24 h and spraying the leaves on the adaxial and abaxial sides. At 35 days after transplanting, the interaction between water salinity and hydrogen peroxide concentrations did not significantly interfere with plant physiology and growth, except for the number of leaves. The hydrogen peroxide did not cause significant effects on any of the evaluated plant variables. Increasing salinity of irrigation water led to reduction in gas exchanges at 61 and 96 days after transplanting. Water salinity inhibited the CO2 assimilation, transpiration, stomatal conductance, instantaneous carboxylation efficiency and stem diameter of passion fruit plants.

scholarly journals MORFOFISIOLOGIA E QUALIDADE DE MUDAS DE MARACUJAZEIRO SOB DIFERENTES NATUREZAS CATIÔNICAS DA ÁGUA E H2O2

Irriga ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 184-205
Author(s):  
José Joedson Lima Silva ◽  
Geovani Soares De Lima ◽  
Lauriane Almeida dos Anjos Soares ◽  
Iara Almeida Roque ◽  
Maíla Vieira Dantas ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Salt Stress ◽  
Agricultural Sector ◽  
Block Design ◽  
Passion Fruit ◽  
Water Salinity ◽  
Stress Effect ◽  
Passiflora Edulis ◽  
E Mail

MORFOFISIOLOGIA E QUALIDADE DE MUDAS DE MARACUJAZEIRO SOB DIFERENTES NATUREZAS CATIÔNICAS DA ÁGUA E H2O2     JOSÉ JOEDSON LIMA SILVA1; GEOVANI SOARES DE LIMA2; LAURIANE ALMEIDA DOS ANJOS SOARES1; IARA ALMEIDA ROQUE1, MAÍLA VIEIRA DANTAS2 E LUDERLÂNDIO DE ANDRADE SILVA2   1 Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, Brasil. E-mail: [email protected]; [email protected]; [email protected]. 2 Unidade Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, Brasil. E-mail: [email protected]; [email protected].; [email protected].     1 RESUMO   No decorrer dos anos, a salinidade das águas se tornou um dos principais obstáculos do setor agrícola. Este trabalho objetivou avaliar o crescimento, as relações hídricas e a qualidade de mudas de maracujazeiro irrigadas com águas de diferentes composições catiônicas e peróxido de hidrogênio. O experimento foi conduzido em condição de casa de vegetação, no munícipio de Pombal - PB, utilizando-se o delineamento em blocos casualizados, com fatorial 6 x 4, sendo seis composições catiônicas da água de irrigação [S1 – Testemunha (0,3 dS m-1); S2 - Na+; S3 - Ca2+; S4 - Na+ + Ca2+; S5 - Mg2+ e S6 - Na+ + Ca2+ + Mg2+) e quatro concentrações de peróxido de hidrogênio – H2O2 (0, 20, 40 e 60 μM), com quatro repetições. Com exceção do S1, os demais tratamentos foram irrigados com água de 3,6 dS m-1. A concentração de 40 µM de H2O2 reduziu o efeito do estresse salino na área foliar das plantas irrigadas com águas constituídas de Na+, Na+ + Ca2+ e Na+ + Ca2+ + Mg2+. As concentrações de 20 e 40 µM de H2O2 elevaram o índice de qualidade de Dickson das plantas irrigadas com água constituída de Na+ + Ca2+ + Mg2+.   Palavras-chave: Passiflora edulis f. flavicarpa, salt stress, peróxido de hidrogênio.     SILVA, J. J. L.; LIMA, G. S. de; SOARES, L. A. dos A.; ROQUE, I. A.; DANTAS, M. V.; SILVA, L. de A. MORPHOPHYSIOLOGY AND QUALITY OF PASSION FRUIT SEEDLINGS UNDER DIFFERENT CATIONIC NATURES OF WATER AND H2O2     2 ABSTRACT   Over the years, water salinity has become one of the main obstacles in the agricultural sector. This study aimed to evaluate the growth and quality of passion fruit cv. BRS GA1 as a function of different cationic nature of the water and exogenous application of hydrogen peroxide. The experiment was conducted in greenhouse conditions at the Center of Agrifood Science and Technology of the Federal University of Campina Grande, Pombal, Brazil, using a randomized block design, with a 6 x 4 factorial, corresponding to six combinations of water salinity [S1 – Control (0,3 dS m-1); S2 - Na+; S3 - Ca2+; S4 - Na+ + Ca2+; S5 - Mg2+ and S6 - Na+ + Ca2+ + Mg2+] and four concentrations of hydrogen peroxide - H2O2 (0, 20, 40 and 60 μM), with four repetitions. With the exception of S1, the other treatments were irrigated with water of 3.6 dS m-1. The 40 µM concentration of H2O2 reduced the salt stress effect on leaf area of plants irrigated with water consisting of Na+, Na+ + Ca2+ and Na+ + Ca2+ + Mg2+. The 20 and 40 µM concentrations of H2O2 increased the Dickson quality index of plants irrigated with water consisting of Na+ + Ca2+ + Mg2+.   Keywords: Passiflora edulis f. flavicarpa Degener, salt stress, hydrogen peroxide.

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

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).

Sign in / Sign up

Export Citation Format

Share Document