Acid Spray Research Articles

Coriander Seed Quality and Vigour Assessment as Affected by Bioregulators and Varied Irrigation Regimes Based on Climatological Approach

The evaluation of seed quality parameters in coriander (Coriandrum sativum L.) under different irrigation regimes based on climatological approach and varied compositions of stress mitigating chemicals was carried out in the Laboratory of Seed Technology Research Unit, Department of Plant Breeding and Genetics, College of Agriculture, JNKVV Jabalpur (M.P.). The investigation consisted of four Irrigation regimes ie IW/CPE 0.6, 0.8, 1.0 and 1.2 and stress mitigating chemicals (Salicylic acid, thiourea and KNO3) with different concentrations. The experiment was laid out in Completely Randomized Design with three replicates during Rabi season (2020-21 and 2021-22). Marked influence of applied irrigation regime was exhibited by the seed lot collected from plots with IW/CPE ratio 0.8. The maximum standard germination of 82.89% was recorded in seeds from the plants which were grown in sufficient moisture content comprising of IW/CPE 1.2. Exogenous application of salicylic acid improved the seed germination parameters. The highest concentration was most effective in each treatment. Salicylic acid @ 150 ppm expressed better results. The results depicted higher test weight with 17.80g, higher plumule length of 15.75cm, radical length of 5.61 cm, seedling height of 21.36 cm, maximum magnitude 1841.64 and 28.33 of seed vigour index I & II respectively for Jawahar Dhaniya-10 was registered when the seeds harvested from plots with treatment combination of IW/CPE 0.8 along with foliar spray of salicylic acid @ 150ppm (I2C2). Higher content of 89.57% total solids was expressed under interaction of IW/CPE 0.6 with exogenous application of thiourea @ 500ppm (I1C3). Hence it can be concluded that treatment combination of IW/CPE 0.8 along with foliar spray of salicylic acid @ 150ppm (I2C2) ascertained better seed germination and quality attributes.

Retraction: Appraisal of foliar spray of iron and salicylic acid under artificial magnetism on morpho-physiological attributes of pea (Pisum sativum L.) plants.

Retraction: Appraisal of foliar spray of iron and salicylic acid under artificial magnetism on morpho-physiological attributes of pea (Pisum sativum L.) plants.

Zinc nutrition improves fruit yield, quality, and reduces bacterial blight disease severity in pomegranate (Punica granatum L.)

The study was designed to identify the most effective way of fertilizing Zn for improved productivity and quality of pomegranate cv. Bhagwa on calcareous soil. Fertilization methods included foliar sprays of ZnSO4, Zn-EDTA, and amino acid chelated Zn; irrigation applied ZnSO4 and Zn chelate (Zn-EDTA); soil application of ZnSO4 (@ 12.5 and 25.0 g tree−1) and were evaluated on full grown pomegranate orchard for 2 years. All the Zn treatments of foliar and irrigation-applied methods were effective in raising the leaf Zn concentration above the recommended adequate level (>15.98 mg kg−1). Higher number of hermaphrodite flowers was observed with foliar sprays of ZnSO4, amino acid chelated Zn, irrigation applied Zn-chelate, and soil application of ZnSO4 @ 25 g Zn tree−1. Various Zn application methods except irrigation-applied ZnSO4 increased fruit yield by 4.33–23.63%. Some of the Zn treatments viz. foliar sprays of ZnSO4, amino acid chelated Zn and irrigation-applied Zn-chelate caused substantial improvement in fruit quality attributes such as fruit size, aril and juice percent, biochemical attributes like juice acidity (by 8.33–13.89%), anthocyanin, ascorbic acid concentration, and enrichment of Zn in the edible part of the fruit. Interestingly, sprays of ZnSO4 also enriched Fe, Mn, and Cu in the arils. While some of the Zn treatments viz. foliar spray of ZnSO4, irrigation-applied Zn-chelate and soil application of ZnSO4 could reduce bacterial blight disease incidence by 19.29–25.97% and severity by 22.18–47.36%. Hence, foliar sprays of ZnSO4 are recommended for enhancement of fruit yield as well as quality in pomegranate.

EFFECT OF FOLIAR SPRAY OF ASCORBIC ACID ON NODULATION, GAS EXCHANGE ATTRIBUTES AND MINERAL ION CONTENTS OF PISUM SATIVUM UNDER ZINC STRESS

Heavy metal toxicity is one of the major abiotic stresses leading to hazardous effects in plants. Ascorbic acid is regarded as one of the most effective antioxidants present in plants. A pot experiment was conducted to determine the effect of foliar spray of ascorbic acid on nodulation, gas exchange attributes, and mineral ion contents of pea (Pisum sativum L.) cultivars under zinc stress. Seeds of two pea cultivars cv. 2001-40 and cv. Meteor were sown in pots following a completely randomized design (CRD) with three replicates. Treatments of ZnSO4.7H2O (5 and 10 mg kg-1) were applied through the rooting medium whereas ascorbic acid (5 ppm and 10 ppm) as foliar sprays after three weeks of germination. Results revealed that zinc stress reduced the growth, gas exchange attributes, potassium and calcium contents of roots and shoots of both the pea cultivars. However, foliar spray of ascorbic acid counteracted the adverse effect of zinc stress on the growth of both pea cultivars. The application of 10 mg kg-1 ascorbic acid proved to be more effective in inducing zinc stress tolerance as compared to other levels. Growth and gas exchange attributes of zinc-stressed plants of both cultivars were also enhanced due to foliar applied ascorbic acid which was positively associated with mineral ion contents. Overall, foliar-applied ascorbic acid ameliorated the adverse effect of zinc stress on nodulation and growth attributes of pea cultivars.

Expression and functional analysis of CsA-IPT5 splice variants during shoot branching in Camellia sinensis.

Alternative splicing (AS) is a process by which several functional splice variants are generated from the same precursor mRNA. In our recent study, five CsA-IPT5 splice variants with various numbers of ATTTA motifs in the untranslated regions (UTRs) were cloned. Meanwhile, their transient expression, as well as the expression and functional analysis in the two shoot branching processes were studied. Here, we examined how these splice variants regulate the other three important shoot branching processes, including the spring tea development, the distal branching of new shoots, and the shoot branching induced by 2,3,5-triiodobenzoic acid (TIBA) spraying, and thus unraveling the key CsA-IPT5 transcripts which play the most important roles in the shoot branching of tea plants. The results showed that the increased expression of 5′ UTR AS3, 3′ UTR AS1 and 3′ UTR AS2 could contribute to the increased synthesis of tZ/iP-type cytokinins (CKs), thus promoting the spring tea development. Meanwhile, in the TIBA-induced shoot branching or in the distal branching of the new shoots, CsA-IPT5 transcripts regulated the synthesis of CsA-IPT5 protein and CKs through transcriptional regulation of the ratios of its splice variants. Moreover, 3′ UTR AS1 and 3′ UTR AS2 both play key roles in these two processes. In summary, it is revealed that 3′ UTR AS1 and 3′ UTR AS2 of CsA-IPT5 might act as the predominant splice variants in shoot branching of the tea plant, and they both can serve as gene resources for tea plant breeding.

The Effects of Proline on the Yield and Essential Oil Content of Turnip-Rooted Parsley (Petroselinum crispum ssp. tuberosum)

Proline is an amino acid that increases plant tolerance to abiotic and biotic stresses, but the effects of its application can be influenced by many factors. The present study investigated the effects of time and the number of applications of this amino acid on the yield of root parsley in field conditions. The experimental material comprised of two parsley cultivars (Petroselinum crispum (Mill.) Nyman ex A.W. Hill), ‘Halblange’ and ‘Sonata’. The parsley plants were sprayed with proline (1000 mg L−1) at growth stages determined according to the BBCH scale: BBCH 15–16 (I: 5–6 leaf phase), BBCH 41 (II: roots start to widen, diameter > 0.5 cm), and BBCH scale 42–43 (III: roots are 20–30% of the typical diameter), including I + II, II + III, and I + II + III. The time and number of proline applications affected the weight of leaves and the total and marketable yield. The amino acid spraying increased the average number of plants during harvest in the ‘Halblange’ but decreased the number in the ‘Sonata’ in all applications. Using proline twice or three times reduced the total essential oil content and modified its composition. The most beneficial effect in terms of the composition was achieved by using proline twice at stages II + III, even in ‘Sonata’, where the values were lower in the other treatments than in the control. Spraying three times did not give better results in terms of the composition and content of the essential oil. However, the use of this amino acid did not affect the total and marketable yield of the roots or the leaf weight of the parsley compared to the control. Our study showed that the time of the proline application may be more important than the number of applications, and the results may be cultivar-dependent.

Organic onion growth, yield and storage improved by foliar sprays of microalgae and fulvic acid as a natural biofertilizer

The use of microalgae as natural biofertilizer in horticulture has recently been reported, while the use of humic substances is widespread. However, the combined use of microalgae with humic substances applied to plant leaves is still unexploited. Thus, the objective of this work was to combine fulvic acid (FA) with the Scenedesmus subspicatus microalga biomass (SC) as a natural biofertilizer applied via leaf in two onion cultivars in organic system. Four experiments were conducted: i) bioassays to verify the bioactive effect of FA, SC and combinations using the Vigna radiata model plant; ii) greenhouse pot experiment with foliar applications of FA, SC and combination in two onion cultivars; iii) field experiment in organic system with foliar applications of FA, SC and combination in two onion cultivars; and iv) onion bulb storage experiment. The bioactive effect of SC, FA and their combinations was identified by promoting changes in root growth of V. radiata. In pots, treatments containing FA, SC and combination promoted increase in fresh and dry leaf mass. The foliar application of FA, SC and combination promoted an increase in field bulb productivity, reduced mass loss in stored bulbs and increased carbohydrate, amino acid and protein contents in onion bulbs.

Anticorrosion Performance of Magnesium Hydroxide Coatings on Steel Substrates

Sewerage systems consist of several different parts, components and materials. Many of them are metallic structures, such as pumps, valves, ladders and wells, which are necessary for the proper operation of wastewater transport systems. Wastewater pipelines can be a highly corrosive environment, mainly due to the presence of biogenic sulfuric acid. In the present study, seven magnesium hydroxide and one magnesium oxide materials were used as protective coatings applied onto the surface of certain stainless steel and mild steel specimens against sulfuric acid corrosion. The coated specimens were subjected to accelerated sulfuric acid spraying tests and their behavior was evaluated by using optical observation, mass measurements and electrochemical impedance spectroscopy. According to the results, the coating prepared from a magnesium hydroxide powder with relatively low specific surface area and smaller particle size was optimal for the protection of the examined steel specimens.

Comparison of the Effect of Injectable Tranexamic Acid and Inhaled Desmopressin in Controlling Bleeding and Ecchymosis in Open Rhinoplasty.

Bleeding during rhinoplasty surgery has a negative effect on the quality of surgery; so, it is important to reduce bleeding during rhinoplasty. We aimed to evaluate the effect of injectable tranexamic acid (TXA) and nasal spray of desmopressin (DDAVP) on reduction in intraoperative bleeding and ecchymosis after open rhinoplasty. In a Randomized Clinical Trial ( RCT) prepared since 2020 to 2021 in Razi Hospital and Imam Khomeini Hospital, Tehran, Iran on 42 patients who underwent open rhinoplasty were divided into three groups. In the first group, TXA was injected one hour before surgery at a dose of 10 mg / kg with a placebo inhalation spray. In the second group, DDAVP was administered as a nasal spray at a dose of 40 mcg with a placebo injection. The third group received a placebo spray and placebo injection. All required data were gathered and analyzed. In TXA group and DDAVP groups, the volume of bleeding during surgery significantly (P=0.022) decreased compared to placebo group, also, the quality of the surgical field and the surgeon's satisfaction significantly (P=0.007) improved compared to the placebo group but not with each other. Unlike placebo group, there were no reports of postoperative bleeding in the TXA and DDAVP groups. Duration of surgery, ecchymosis on the day after surgery and coagulation tests before and after surgery were not significantly different in three groups. Use of DDAVP and TXA can both reduce the amount of bleeding during surgery and postoperative bleeding in rhinoplasty and improve the quality of the surgical field and the surgeon 's satisfaction during surgery.

Effects of lime and oxalic acid on antioxidant enzymes and active components of Panax notoginseng under cadmium stress

Cadmium (Cd) pollution poses potential safety risks for Panax notoginseng cultivation, a medicinal plant in Yunnan. Under exogenous Cd stress, field experiments were conducted to understand the effects of lime (0, 750, 2250 and 3750 kg hm−2) applied and oxalic acid (0, 0.1 and 0.2 mol L−1) leaves sprayed on Cd accumulation, antioxidant system and medicinal components of P. notoginseng. The results showed that Lime and foliar spray of oxalic acid were able to elevate Ca2+ and alleviate Cd2+ toxicity in P. notoginseng under Cd stress. The addition of lime and oxalic acid increased the activities of antioxidant enzymes and alters osmoregulator metabolism. The most significant increase in CAT activities increased by 2.77 folds. And the highest increase of SOD activities was 1.78 folds under the application of oxalic acid. While MDA content decreased by 58.38%. There were very significant correlation with soluble sugar, free amino acid, proline and soluble protein. Lime and oxalic acid were able to increase calcium ions (Ca2+), decrease Cd content and improve the stress resistance of P. notoginseng, while increasing the production of total saponins and flavonoids. Cd content were the lowest, 68.57% lower than controls, and met the standard value (Cd ≤ 0.5 mg kg−1, GB/T 19086-2008). The proportion of SPN was 7.73%, which reached the highest level of all treatments, the flavonoids content increased significantly by 21.74%, which reached the medicinal standard value and optimal yield.

Preparation of Magnesium Chloride from Magnesite Dust Using Hydrochloric Acid Leaching and Spray Drying

Preparation of Magnesium Chloride from Magnesite Dust Using Hydrochloric Acid Leaching and Spray Drying

Response of date palm offshoots (Phoenix dactylifera L.) to the foliar spray of salicylic acid and citric acid under salinity conditions

Abstract Antioxidants enhance the salt tolerance of date palms. A field experiment was carried out on date palm offshoots to improve the salt tolerance of the Sayer cultivar. Salicylic acid and citric acid (500 and 1,000 ppm) were used. The results showed that all growth parameters of plant height, leaf area, and leaf numbers decreased under the salinity conditions. The antioxidant applications increased the plant height, leaf area, carbohydrates, and relative water content compared with the control. Citric acid at 1,000 ppm decreased electrolyte leakage and malondialdehyde. Indoleacetic acid decreased, whereas abscisic acid increased under salinity. The antioxidant application increased indoleacetic, whereas abscisic acid decreased. Proline, protein content, and peroxidase activity increased under antioxidants. Also, the potassium and K/Na ratio increased under antioxidant applications. Citric acid improved the characteristics more than salicylic acid, encouraging farmers to use it for its low cost as an antioxidant to reduce environmental stress damage.

Response of Wheat Cultivars Triticum Aestivum L. to Spraying with Amino Acid Solution Green (GREIT VG)

A field experiment was conducted in Al-Fadhiliya region, 11 km south of Dhi Qar Governorate during the winter agricultural season 2021-2022, to find out the response of wheat cultivars to effect spraying with amino acid solution Green (GREIT VG) as (100% bio stimulant of plant origin containing amino acids at a concentration of 15-30) L.ha-1 (Italian origin, use minimum concentration). The experiment was carried out according to Split Plot Design and using the RCBD Design with three replications. The first factor included spray levels of amino acids (F) (spray in the Tillering stage ZGs21 (F1), spray in the elongation stage ZGs32 (F2), spray in the Boot stage ZGs49 (F3)) (in main plot), while the second factor included the wheat varieties (V)(Al-Rasheed (V1), Bora (V2), ) Abaa 99 (V3) (in sub plot). The results showed the level of amino acid spray (F1) is superior in most of the studied traits (Chlorophyll content 0.7878, flag leaf area 54.78 cm2, number of tillers 426.2 tiller.m-2, number of grains per spike 64.67 grain. spike-1, total grain yield 1.7429t.h-1). However, the level of amino acid spray (F2) is higher (plant height 113.67 cm, weight of 1000 grains 42,371g). Al-Rasheed cultivar (V1) excelled in (plant height 119.22 cm, chlorophyll content 0.7622, flag leaf area 59.96cm-2, number of grains per spike 66.67 grains, spike-1), while Bora cultivar (V2) excelled in the number of tillers 484.7 triller.m-2, the weight of 1000 grains 44.099 g, so the total grain yield is 1.6887 t.h-1. Interaction treatment (F1 V2) gave the highest mean of total grain yield of 1.8540 t.h-1.

Effect of glutamic acid spraying and nano zinc oxide in the growth and content qualities of Lavendula Angustifolia Mill

The study was conducted in the wooden canopy of the Department of Horticulture and garden Engineering / College of Agriculture / University of Tikrit during the 2021 agricultural season, in order to study the effect of spraying with glutamic acid and Nano-zinc oxide on some vegetative growth characteristics and mineral content of Lavendula Angustifolia Mill plant. A factorial experiment was carried out with two factors, the first factor of glutamic acid with three levels (0, 100, and 200) mg. L1- The second factor is Nano zinc oxide at four levels (0, 0.50, 1, and 1.50 g). L1 - According to the design of the full randomized RCDB sectors (Randomized Complete Block Design) and three duplicates, the most important results are summarized as follows: Characteristics of vegetative growth: The transaction G2 was characterized by giving the highest differences in plant height, the number of leaves, and total chlorophyll content, which amounted to 32.475 cm and 876.12 leaves. Plant-1, 35.128 mg. gm 1-soft weight, respectively, compared to the lowest values for the above-mentioned traits for the comparison transaction.

Effect of glutamic acid spraying and nano zinc oxide in the growth and content qualities of Lavendula Angustifolia Mill

The study was conducted in the wooden canopy of the Department of Horticulture and garden Engineering / College of Agriculture / University of Tikrit during the 2021 agricultural season, in order to study the effect of spraying with glutamic acid and Nano-zinc oxide on some vegetative growth characteristics and mineral content of Lavendula Angustifolia Mill plant. A factorial experiment was carried out with two factors, the first factor of glutamic acid with three levels (0, 100, and 200) mg. L1- The second factor is Nano zinc oxide at four levels (0, 0.50, 1, and 1.50 g). L1 - According to the design of the full randomized RCDB sectors (Randomized Complete Block Design) and three duplicates, the most important results are summarized as follows: Characteristics of vegetative growth: The transaction G2 was characterized by giving the highest differences in plant height, the number of leaves, and total chlorophyll content, which amounted to 32.475 cm and 876.12 leaves. Plant-1, 35.128 mg. gm 1-soft weight, respectively, compared to the lowest values for the above-mentioned traits for the comparison transaction.

Effect of foliar spray of gibberellic acid (GA3) and borax on growth, productivity, and quality of tomato (Lycopersicon esculentum Mill.) under protected structure at Kaski, Nepal

Tomato (Lycopersicon esculentum Mill.) is a highly demanded solanaceous vegetable crop in Nepal. Poor vegetative growth, low flowering and fruit set are the major problems in tomato. Thus, an experiment was conducted to improve vegetative growth, flowering, fruiting and productivity of tomato (Nepali Variety Type 2) at Pokhara-14, Kaski, Nepal during spring- summer of 2019 in Split plot arrangement with gibberellic acid (GA3) as main factor and Borax as sub factor, with three replications. The main factor consisted of four concentrations of GA3 (0, 25, 50 and 75 ppm) which was applied thrice as foliar spray at 15, 30 and 45 days after transplanting (DAT) and sub factor consisted three concentrations of borax (0%, 0.25% and 0.5%) which was applied four times as foliar spray at 15, 30, 45 and 60 DAT. Growth characters viz., plant height, leaf area, leaf number, flower number per cluster, fruit number were significantly enhanced with application of 50 ppm GA3 and gave higher productivity (31.65 t ha-1) compared to other concentrations and control. Likewise, foliar spray of borax resulted in higher stem girth, flower clusters, number of flowers per cluster, and TSS content of tomato. Furthermore, borax @ 0.25% gave the highest productivity (30.78 t ha-1). The better effect of 50 ppm GA3 on growth and yield of tomato and effect of 0.25% borax on flowering and yield, makes them promising solutions to the problems of tomato at Kaski, Nepal. Thus, further research should be conducted by using GA3 and borax in several other tomato cultivars in field and under protected structure at different soil type and climatic conditions.

Efficacy Evaluation of Abiotic Elicitors for the Management of Black Rot Disease of Cauliflower Incited by Xanthomonas campestris pv. campestris

Aims: To find out the effective abiotic elicitor for management of black rot disease of cauliflower.
 Study Design: Completely randomized block design (Pot experiment in glasshouse condition).
 Place and Duration of the Study: This experiment was conducted at glasshouse of Division of Plant Pathology, ICAR-IARI, New Delhi during the year 2021-22.
 Methodology: Different abiotic elicitors were applied by spraying whole plants (45 days old) with the aid of a fine atomizer onto the upper leaf surfaces. Pathogen X. campestris pv. campestris was inoculated after 72 h of elicitor treatment, Control plants were treated with the distilled water. The disease assessment was done at 14 and 21 days after inoculation by using six- point scale and Percent Disease severity was calculated.
 Results: In case of foliar spray of Salicylic acid before 72 h of inoculation of pathogen, minimum percent diseases severity (25.56) was recorded at the concentration of 3 mM after 21 days of pathogen inoculation. In case of BABA, minimum percent disease severity (18.37) was observed at 800 \(\mu g/ml\) concentration. INA helps to reduce the disease severity at 100 uM concentration. ASM was found effective at 350\(\mu g/ml\) with 14.07% disease severity and 82.91% disease control efficiency. In case of MeJA, minimum percent disease severity (30.32) was observed at 2mM concentration.
 Conclusion: Among all the tested abiotic elicitors at different concentration, ASM at the concentration of 350 \(\mu g/ml\)was found very effective to manage the disease.
 Black rot caused by Xanthomonas campestris pv. campestris (Xcc) is a very important and devastating disease of cauliflower (Brassica oleracea var. botrytis) crop resulting into 10–50% yield losses every year. So for the management of black rot disease, five abiotic elicitors viz; salicylic acid(SA-0.5, 1.0, 2.0, 3.0 mM), methyl jasmonte (MeJA-0.5, 1.0, 1.5, 2.0mM), \(\beta\)-Aminobutyric acid (BABA-200, 400, 600, 800 \(\mu g/ml\), acibenzolar-S- methyl (ASM-150, 250, 350, 450 \(\mu g/ml\)) and dichloroisonicotinic acid (INA-50, 100, 150, 200 \(\mu \)M) were tested to induce systemic resistance against the disease. The experiment was conducted under glasshouse condition at Division of Plant Pathology, ICAR-IARI, New Delhi during the year 2021-22. Foliar application of these abiotic elicitors was done on 45 days old plants of susceptible cv. Pusa Sharad of cauliflower. Results indicated that among all the tested chemical elicitors at different concentration, ASM@350 \(\mu g/ml\) was found very effective to manage the disease. It shows 82.91% disease control efficacy with 14.07% disease severity.

Gel immersion endoscopic mucosal resection with acetic acid spray for sessile serrated lesion extending close to the appendiceal orifice.

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Effect of Pinching and Spraying of Paclobutrazol and Ascorbic Acid in Flowering Growth Characters of zinnia elegans L.

The current study was conducted during the period from April 2021 to August 2021 on Zinnia elegans L. Its flowers are purple in color to study the effect of pinching of the growing tip of the plant or without, and spray twice the shoot system with paclobutrazol at concentrations (0, 15 and 30) mg. L-1 and ascorbic acid at concentrations (0, 150 and 300) mg. L-1, in the qualities of vegetable growth, The factorial experiment was implemented using Randomized Complete Block Design within Split Plot, with three replicates and seven plants for the experimental unit. The results indicated the following: The pinching of the growing top of the plant led to a delayed the date of flowering, increased inflorescences longevity and increased morally in the content of anthocynin in flowers40.58 mg.100g-1 wet weight. The spraying of paclobutrazol at a concentration of 30 mg. L-1 delayed the date of flowering and increased inflorescences longevity, while spraying in both concentrations 15 and 30 mg. L-1 increased the number of flowers to 2.09 and 2.32 flower. per plant, respectively. Ascorbic acid spraying delayed the date of the flowering and led to spraying at a concentration of 300 mg. L-1 and increased inflorescences longevity, and significantly increased the content of anthocynin in inflorescences to 51.23 mg.100g-1 wet weight.

Salicylic acid improves physiological indicators of soursop irrigated with saline water

ABSTRACT Plants grown under salinity are subject to osmotic and ionic stresses that cause several physiological changes, so searching for strategies that minimize the deleterious effects is essential for the development of irrigated agriculture. In this context, the objective was to evaluate the effects of foliar applications of salicylic acid on the mitigation of the effects of salt stress on photosynthetic pigments and chlorophyll a fluorescence of soursop cv. Morada Nova. The study was conducted in a greenhouse, in a randomized block design and 5 × 4 factorial arrangement, with five values of electrical conductivity of irrigation water - ECw (0.8 - control, 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. Foliar application of salicylic acid at a concentration of 1.4 mM mitigated the effects of salt stress on chlorophyll a, chlorophyll b, chlorophyll total, and carotenoids of soursop when irrigated with water of up to 1.5 dS m-1. Salicylic acid at concentrations above 1.4 mM combined with irrigation with saline water intensified the deleterious effects on photosynthetic pigments. Chlorophyll a fluorescence was not influenced by salicylic acid sprays up to the concentration of 3.6 mM.