scholarly journals Physiological indices of okra under organomineral fertilization and irrigated with salt water

2021 ◽  
Vol 25 (7) ◽  
pp. 466-471
Author(s):  
Jonnathan R. da S. Sales ◽  
Clarissa L. Magalhâes ◽  
Ana G. S. Freitas ◽  
Geovana F. Goes ◽  
Henderson C. de Sousa ◽  
...  
Keyword(s):  
Salt Stress ◽  
Gas Exchange ◽  
Salt Water ◽  
Organic Fertilizer ◽  
Co2 Concentration ◽  
Mineral Fertilization ◽  
Internal Co2 Concentration ◽  
Physiological Indices ◽  
Internal Co2

HIGHLIGHTS Salt water reduces gas exchange in the okra crop, but organomineral fertilization mitigates these effects. The use of organic and mineral fertilization is viable in okra crops under salt stress. Organic fertilizer (100% bovine biofertilizer) decreases internal CO2 concentration.

scholarly journals Physiological response of maize under different fertilization management under drought condition

2021 ◽  
Vol 13 (1) ◽  
pp. 10880
Author(s):  
Tayron R. S. COSTA ◽  
Matheus A. BORBA ◽  
José E. COSTA ◽  
Valéria F. O. SOUSA ◽  
Manoel B. ALBUQUERQUE ◽  
...  
Keyword(s):  
Plant Height ◽  
Photosynthetic Rate ◽  
Co2 Concentration ◽  
Mineral Fertilizers ◽  
Organic Fertilization ◽  
Mineral Fertilization ◽  
Internal Co2 Concentration ◽  
Stalk Diameter ◽  
Chemical Fertilization ◽  
Internal Co2

This work was aimed to evaluate the development of maize cultivated under different fertilization management, in order to establish an alternative for mineral fertilization. The experiment was carried out in the experimental area of Chã de Jardim, in Areia, Paraíba, Brazil. Six treatments were used with four replications. Plant height, stalk diameter, leaf number, chlorophyll a, b and total, photosynthetic rate, transpiration, stomatal conductance and internal CO2 concentration in the leaf were evaluated. In the 30 days after emergence, superiority of treatments was observed in the plants under chemical fertilization for plant height and number of leaves. For diameter of stalk the treatment organic fertilization + P and K showed superiority. At 60 days after planting the chemical fertilization provided the highest averages for plant height and stalk diameter. For the photosynthetic rate, transpiration and internal CO2 concentration, the treatment that presented the highest average was observed in plants under organic fertilization combined with P and K and N added in top-dressing. For the chlorophyll, the chemical fertilization provided the highest values. Organic fertilization in association with mineral fertilizers provided results close to those observed in mineral fertilization, being an alternative for nutritional management in maize.

scholarly journals Development, Physiology and Productivity of the Common Bean Under Different Nitrogen Doses

2018 ◽  
Vol 10 (6) ◽  
pp. 171
Author(s):  
João Everthon da Silva Ribeiro ◽  
Arliston Pereira Leite ◽  
José Eldo Costa ◽  
Manoel Bandeira de Albuquerque ◽  
Fábio Mielezrski
Keyword(s):  
Gas Exchange ◽  
Common Bean ◽  
Co2 Concentration ◽  
Fluorescence Maximum ◽  
Internal Co2 ◽  
Common Bean Cultivar ◽  
Number Of Leaves ◽  
Use Efficiency ◽  
The Common ◽  
Pod Number

Among nutrients, nitrogen is required in the greatest quantities by bean culture. The objective of this work was to evaluate growth, physiological responses and productivity of the common bean cultivar, ‘IAC Imperador’ under varying nitrogen doses in Brejo Paraibano. The experiment was carried out at Fazenda Experimental Chã-de-Jardim (Chã-de-Jardim Experimental Farm), of the Centro de Ciências Agrárias of the Universidade Federal da Paraíba, in the municipality of Areia, state of Paraíba. The treatments comprised 0, 50, 100, 150 and 200 kg of nitrogen ha-1, applied in coverage at 35 days after sowing. To assess growth, plant height, stem diameter and number of leaves were evaluated. For gas exchange, photosynthesis rate, internal CO2 concentration, transpiration, stomatal conductance, instantaneous water use efficiency and instantaneous carboxylation efficiency were evaluated. For chlorophyll “a” fluorescence, minimum leaf fluorescence, maximum leaf fluorescence, variable maximum fluorescence, potential quantum efficiency of PSII (Photosystem II) and ratio (Fv/F0) were evaluated. For the components of primary productivity, the height of insertion of the first pod, number of pods per plant and the number of grains per pod were evaluated. Nitrogen fertilization in coverage significantly affected most of the growth, gas exchange and productivity variables, with the dose of 200 kg ha-1 being responsible for the highest values (p < 0.05). Chlorophyll fluorescence showed no significant differences among the nitrogen doses. The nitrogen doses influenced the growth, gas exchange and productivity of the common bean in the region of Brejo Paraibano. 

scholarly journals Determination of damaged leaf area and physiological responses of melon plants submitted to different infestation levels of Liriomyza sativae

2017 ◽  
Vol 35 (4) ◽  
pp. 571-575 ◽  
Author(s):  
Ewerton M Costa ◽  
Rômulo Magno O Freitas ◽  
Paolo Augustus F Silva ◽  
Elton Lucio Araujo
Keyword(s):  
Stomatal Conductance ◽  
Leaf Area ◽  
Physiological Responses ◽  
Co2 Concentration ◽  
Internal Co2 Concentration ◽  
Liriomyza Sativae ◽  
Leaf Transpiration ◽  
Rate Of Photosynthesis ◽  
Internal Co2

ABSTRACT The leafminer Liriomyza sativae (Diptera: Agromyzidae) is one of the main pests of melon crop (Cucumis melo) in the Brazilian semiarid. The aims of this study were to determine the damaged leaf area and assess the physiological responses of melon plants submitted to different levels of infestation per larvae of L. sativae. The study was carried out in a greenhouse, using plants of melon of the cultivar Iracema (yellow melon). The design utilized was completely randomized, with five treatments {control (no infestation in the leaves) and four infestation levels (1; 10; 20 and 30 larvae per leaf)} and 10 replications (melon plants). Initially we evaluated the physiological aspects: photosynthetic rate (µmol CO2/m2/s), stomatal conductance (mol H2O/m2/s) internal CO2 concentration (µmol CO2/m2) and leaf transpiration (mmol H2O/m2/s). After the measurements of physiological aspects, the evaluated leaves of each plant were cut close to the petiole and scanned individually with a measuring scale on the side, being the determination of the damaged leaf area performed with the aid of software for processing and analysis of images. The averages of damaged leaf area observed were of 1.2; 6.3; 19.6 and 40.8 cm2 for infestations of 1; 10; 20 and 30 larvae/leaf respectively. In relation to the physiological aspects, the rate of photosynthesis, stomatal conductance and transpiration significantly decreased with the increase of leafminer larvae per leaf. The internal CO2 concentration increased with the increase in the number of larvae per leaf.

scholarly journals Leaf gas exchange and chlorophyll index in guava fertirrigated with bovine biofertilizer and nitrogen

2020 ◽  
Vol 9 (9) ◽  
pp. e588997606
Author(s):  
Elisson Alves Santana ◽  
Francisco Eduardo dos Santos Gomes ◽  
Jackson Teixeira Lobo ◽  
Alberto de Andrade Soares Filho ◽  
Ítalo Herbert Lucena Cavalcante ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Net Photosynthesis ◽  
Co2 Concentration ◽  
Psidium Guajava ◽  
N Fertilization ◽  
Chl A ◽  
Internal Co2 ◽  
Chlorophyll Index ◽  
Photosynthetic Responses

The objective of this work was to evaluate the influence of fertirrigation with nitrogen and liquid bovine biofertilizer on gas exchange and leaf chlorophyll index of 'paluma' guava (Psidium guajava L.). The experimental design was randomized blocks with treatments distributed in a factorial arrangement (2 × 4) referring to mineral fertilizing with N (50% and 100% of N recommended) and biofertilizer concentrations (0, 2.5, 5.0 and 7.5% of the fertirrigated volume). Variables evaluated were chlorophyll a (Chl a), chlorophyll b (Chl b), total chlorophyll indexes (Chltotal), internal CO2 concentration (Ci), stomatal conductance (gs), transpiration (E), net photosynthesis (A), instant carboxylation efficiency (iCE) and water use efficiency (WUE). The biofertilizer significantly affected Chl a, Chl b, Chltotal, A, gs and E, with quadratic polynomial adjustment of the results. However, there was no effect of N fertilization and interaction between the factors. Maximum index of Chltotal was 32.31 obtained with the estimated dose of 3.8% of the biofertilizer; while A, gs and E presented maximum responses of 19.09 µmol of CO2 m-2 s-1, 0.28 mol of H2O m-2 s-1 and 4.93 mmol of H2O m-2 s-1, with estimated doses of 3.6%, 3.6%, and 3.7%, respectively. Generally, liquid bovine biofertilizer applied via fertirrigation affects positively the photosynthetic responses in 'paluma' guava, however, with decreasing effects for doses above 3.8%.

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).

scholarly journals Effect of fertigation with potassium and nitrogen on gas exchange and biomass accumulation in eggplant1

2017 ◽  
Vol 47 (3) ◽  
pp. 345-352
Author(s):  
Álvaro Henrique Cândido de Souza ◽  
Roberto Rezende ◽  
Marcelo Zolin Lorenzoni ◽  
Fernando André Silva Santos ◽  
André Maller
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Water Use ◽  
Biomass Accumulation ◽  
Net Photosynthesis ◽  
Dry Weight ◽  
Co2 Concentration ◽  
Internal Co2 ◽  
Use Efficiency ◽  
Total Dry Weight

ABSTRACT Adequate crop fertilization is one of the challenges for agriculture. Measuring gas exchange and biomass accumulation may be used to adjust crop management. The effect of fertigation with potassium (0 kg ha-1, 54 kg ha-1, 108 kg ha-1 and 216 kg ha-1) and nitrogen (0 kg ha-1, 67 kg ha-1, 134 kg ha-1 and 268 kg ha-1) on gas exchange and biomass accumulation in eggplant was assessed under greenhouse conditions. The net photosynthesis, stomatal conductance, transpiration, internal CO2 concentration, instantaneous carboxylation efficiency, water-use efficiency and total dry weight were evaluated. With the exception of K for water-use efficiency and N for internal CO2 concentration, all the other gas exchange parameters were significantly affected by the K and N doses. There was an interaction between N and K doses for net photosynthesis, stomatal conductance, transpiration and instantaneous carboxylation efficiency. The highest values for net photosynthesis, stomatal conductance, transpiration rate, carboxylation instantaneous efficiency and total dry weight were found in the range of 125-185 kg ha-1 of K and 215-268 kg ha-1 of N.

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 Productive and physiological responses of jambu (Acmella oleracea) under nutrient concentrations in nutrient solution

2021 ◽  
Vol 39 (1) ◽  
pp. 65-71
Author(s):  
Italo MG Sampaio ◽  
Mário L Silva Júnior ◽  
Ricardo FPM Bittencourt ◽  
Gabriel AM dos Santos ◽  
Fiama KM Nunes ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Leaf Area ◽  
Nutrient Solution ◽  
Co2 Concentration ◽  
Dry Mass ◽  
Ionic Concentration ◽  
Stem Diameter ◽  
Internal Co2 Concentration ◽  
Internal Co2 ◽  
Fresh And Dry Mass

ABSTRACT In the last years, jambu has become popular and greatly appreciated, due to its remarkable taste. Thus, hydroponically cultivated jambu is promising, since it achieves better yield and production quality. The aim of this study was to evaluate the effect of ionic concentration in nutrient solution on growth, productivity and gas exchange of jambu. The experimental design was completely randomized, with five treatments and four replicates. The treatments consisted of variations of ionic concentration using the nutrient solution proposed by Hoagland & Arnon (25, 50, 75, 100 and 125%). The length of the main stem, stem diameter, number of inflorescence, leaf area, fresh and dry biomass (shoot, root and inflorescence), photosynthesis, stomatal conductance, transpiration, internal CO2 concentration, Ci/Ca ratio and instant carboxylation efficiency were evaluated. Ionic concentrations significantly affected the studied variables, except the stem diameter, the internal CO2 concentration and the Ci/Ca ratio. The number of inflorescences and the leaf area grew linearly with maximum values (37.8 units plant-1 and 1650.8 cm2 plant-1, respectively) obtained in ionic concentration of 125%. Maximum responses were observed for shoot fresh and dry mass (63.9 and 6.9 g plant-1), root fresh and dry mass (16.7 and 2.0 g plant-1) inflorescence fresh and dry mass (11.0 and 1.8 g plant-1), respectively, at ionic concentration of 125%. Liquid photosynthesis, stomatal conductance, transpiration and instant carboxylation efficiency achieved maximum responses of 17.9 µmol CO2 m-2 s-1, 0.3 mol H2O m-2 s-1, 6.3 mmol m-2 s-1 and 0.06 with estimated concentrations of 84, 70, 80 and 83% of ionic strength, respectively. Thus, we concluded that the ionic concentration of 125% is indicated to obtain a greater biomass accumulation.

scholarly journals Stomatal and pavement cell density linked to leaf internal CO2 concentration

2014 ◽  
Vol 114 (2) ◽  
pp. 191-202 ◽  
Author(s):  
Jiří Šantrůček ◽  
Martina Vráblová ◽  
Marie Šimková ◽  
Marie Hronková ◽  
Martina Drtinová ◽  
...  
Keyword(s):  
Cell Density ◽  
Co2 Concentration ◽  
Pavement Cell ◽  
Internal Co2 Concentration ◽  
Internal Co2
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