Quality Of Onion Research Articles

Does chitosan affect bulb yield and quality of sweet onion (Allium cepa L.)?

ABSTRACT Chitosan, a polymer derived from shellfish, may enhance plant health and have antimicrobial properties. Effects of chitosan applications to sweet onion (Allium cepa L.) in the field on bulb yield and quality were evaluated. The study was conducted in Tifton (sandy loam) and Reidsville (loamy sand), GA, during the 2015–2016 and 2016–2017 winter seasons (Dec. to May). “Century” sweet onion seedlings were transplanted to beds (1.8-m centers) in mid-December. Treatments were chitosan (117 mg·L−1) applied before transplanting plus monthly applications at 0, 1, 2, 3, and 4 months after transplanting, and an untreated control (water). Harvested bulbs were stored for 3 mo [2.0°C, 80% RH, 0.586 kPa of vapor pressure deficit, 4% CO2, and 10% O2]. Chitosan did not affect bulb marketable and total number and weight, individual bulb weight, and incidence of bulb sour skin (caused by Burkholderia cepacia). Immediately after harvest, chitosan did not influence bulb dry matter, soluble solids concentration, pungency, and total phenols concentration. However, after 3 months of storage, bulb SSC and total phenols decreased, and bulb dry matter and pungency increased. In conclusion, chitosan applications before and during sweet onion production did not affect marketable or total bulb yield, bulb sour skin incidence, or bulb chemical composition.

Sequential herbicide application coupled with mulch enhances the productivity and quality of winter onion (Allium cepa L.) while effectively controlling the mixed weed flora

Weed control poses substantial difficulties for winter season onion (Allium cepa L.) cultivation in the north-western Indo-Gangetic Plains, primarily due to the constrained efficacy of the existing herbicides. To address this issue, a 2-year field study was conducted to assess the efficacy of pre- and post-emergence herbicides (pendimethalin, ethoxysulfuron, imazethapyr, and quizalofop-p-ethyl) individually and in combination with crop residue mulch for weed control in winter onion. The results revealed that using herbicides or mulches in isolation did not provide satisfactory weed control. However, the integration of natural mulch with pendimethalin followed by quizalofop-p-ethyl application proved to be the most effective weed control strategy, resulting in the least reduction in bulb yield (10.3%) compared to other treatments. On the contrary, combinations of pendimethalin with ethoxysulfuron or imazethapyr showed adverse effects on the onion crop and inflicted the highest yield losses among all treatments (78.6 and 83.4%, respectively). However, the combination of pendimethalin with quizalofop-p-ethyl coupled with crop mulch resulted in season-long weed control and over 80% bulb yield (36.58 t/ha) gains compared to the weed-free condition. These findings emphasize the efficacy of combining herbicides and mulches as an integrated weed management strategy for onions. By adopting such integrated approaches, farmers could improve weed control while maintaining bulb yield and quality, reducing the risks associated with herbicide resistance, and promoting sustainable onion production in the north-western Indo-Gangetic Plains.

Combination effect organic and inorganic manure on growth, yield & quality of onion (Allium cepa L.)

Combination effect organic and inorganic manure on growth, yield & quality of onion (Allium cepa L.)

ВОДОПОТРЕБЛЕНИЕ, УРОЖАЙНОСТЬ И КАЧЕСТВО ЛУКА РЕПЧАТОГО В ЗАВИСИМОСТИ ОТ ПРИМЕНЕНИЯ ГУМИНОВЫХ УДОБРЕНИЙ ПРИ КАПЕЛЬНОМ ПОЛИВЕ В САРАТОВСКОМ ЗАВОЛЖЬЕ

Purpose: to study the features of humic fertilizer impact on water consumption, yield and quality of onions under drip irrigation in the dry-steppe zone of Saratov Trans-Volga region. Materials and methods. Field studies were carried out on dark chestnut soils in 2019–2022. The objects of the study were the zoned Chalcedony variety and fertilizers based on humic acids. Related observations and studies of water consumption, productivity formation and yield quality were carried out using generally accepted methods. Results. Research has shown that when maintaining a drip irrigation regime, which involves watering when soil moisture is reduced to 80 % of the lowest moisture capacity in the 0–30 cm layer, the total water consumption of onions on average over the years of the study amounted to 4102 cub. m/ha, average daily – 31 cub. m/ha. The humic fertilizer application contributed to a more economical use of moisture and irrigation water, as evidenced by a decrease in the water consumption coefficient by 7.1–23.3 %, and the cost of irrigation water to form a unit of marketable output by 15.9–24.0 %. Humic fertilizers also provided a significant yield increase – 4.9–15.31 t/ha (10–31 % higher than the control – without fertilizers). Conclusions: the humic fertilizer application, which have stimulating and adaptogenic features, when growing onions under the arid conditions of the Saratov Trans-Volga region with drip irrigation, is an effective technique that ensures more economical use of water resources and increases the yield of one of the leading vegetable crops – onions.

Maintenance of fresh-cut green onion quality and storability using some sanitizing treatments during cold storage.

Maintenance of fresh-cut green onion quality and storability using some sanitizing treatments during cold storage.

NANO FERTILIZERS WITH ALGAE EXTRACT AS BIOSTIMULANT AFFECTING GROWTH, BULB YIELD, AND QUALITY OF ONION (ALLIUM CEPA L.)

Biostimulants (nano fertilizers, algal extract) are synthetic or natural compounds for application to seeds, plants, and soil to increase crops, particularly onion yields. These substances cause changes in vital structural processes to influence plant growth through improved tolerance to abiotic stresses and enhance seed and grain yield and quality. The presented study aims to determine if biostimulants beneficially increase onions’ vegetative growth, harvest, and quality of onions (Allium cepa L.). A randomized complete block design with three replications helped compare various rates of Nano NPK fertilization (0.1, 0.2, 0.4, 0.6, 0.8, and 1.0 g/L Nano NPK + 0.5 g/L algae extract, 1.0 g/L mineral NPK + 0.5 g/L algae extract, 1.0 g/L mineral NPK, 1.0 g/L Nano NPK, and 0.5 g/L algae extract) with the control treatment (spraying distilled water only). The results showed as the Nano NPK + 0.5 g/L algae extract levels decreased, all studied parameters gradually declined. Foliar application of Nano NPK 1.0 g/L combined with 0.5 g/L algae recorded the highest significant effects, followed by 1.0 g/L mineral NPK + 0.5 g/L algae and 0.8 g/L Nano NPK + 0.5 g/L algae compared with the control. The highest values of bulb diameter (10.1 cm/plant), plant height (108.7 cm/plant), plant fresh weight (254.7 g/plant), and fresh yield (25.67 t/ha) emerged with foliar application of Nano NPK 1.0 g/L combined with 0.5 g/L algae, and the lowest values, obtained from the control treatment, were 4.2 cm/plant, 62.3 cm/plant, 100.23 g/plant, and 10.09 t/ha, respectively. The results suggested that using the algae extract combined with nano fertilizer treatment as a biostimulant will maximize onion growth parameters, yield production, and nutrient contents

Optimizing the Planting Date for Onion Production

This investigation was carried out during 2018 and 2019 at the research farm of the Agriculture Faculty of Kabul University, Afghanistan to study the correlation between weather conditions (maximum, minimum and mean temperature, relative humidity, cumulative day light and cumulative rainfall) and onion plant growth, yield and bulbs quality, as well as to find the optimal planting date for onion variety Safid e Paisaye. The data was analyzed with STAR software. The results of this study reveal that, increasing temperature and decreasing relative humidity and rainfall during growing season, caused faster maturity of bulbs, produced small sized bulbs, and finally reduced onion bulbs yield. It was observed that, due to relatively lower temperature and higher relative humidity during early growth stages the onion grown early in spring (seed sown in early March and transplants planted early in May) took longer period for maturation, produced larger bulbs and higher yield. This was also noted that due to longer maturation period the onion plants grown in early spring received a higher cumulative heat and sun light which contributed to improve bulbs quality and yield of onion. Based on this study results it is concluded that, early planting date of onion variety Safid e Paisaye not only increased significantly yield but also improved bulbs quality.

Influence of chemicals and crude plant materials as pre-storage treatment on seed quality of onion (Allium cepa L.)

Fresh onion seeds dried to 7.0% seed moisture content were stored with crude plant materials (red chili powder@20g/kg of seed; neem leaf powder@ 20g/kg of seed, lemon leaf powder @ 20g/kg seed), and chemicals (common bleaching powder and mancozeb @ 2g/kg of seed). The germination potential of onion seeds was found satisfactory in treated seeds. Water uptake during imbibition was maximum in lemon leaf treated seed which indicates better germination as the imbibition of water is an essential part of germination. A high correlation between EC measurements and germination was found; which indicates that conductivity readings have the potential to provide a rapid assessment of standard laboratory germination. In terms of seed-associated pathogens during storage, chemicals have shown better results in suppressing pathogens. Bangladesh J. Agri. 2023, 48(2): 54-62

Biostimulants Affect Differently Biomass and Antioxidant Status of Onion (Allium cepa) Depending on Production Method

Onions, essential in various salads and cooked dishes, are sought after by producers for high yields, while consumers value their quality, particularly the presence of antioxidant compounds. This study investigates the impact of production methods and biostimulants on the biomass yield and quality of onions. The two-year experiment was conducted in Vojvodina, Serbia, and compared directly seeded (DS) and from-set (FS) onions with four biostimulant treatments: control (C), seaweed extracts (T1), humic and fulvic acids (T2), and Trichoderma sp. (T3). DS onions yielded significantly more biomass, while FS onions had higher dry matter content. DS onions treated with T1 showed a significant increase in phenols (↑ 5.30%), while T2 and T3 led to declines (↓ 8.66% and ↓ 7.55%, respectively). All biostimulants reduced phenol content in FS onions. T1 and T2 significantly increased the flavonoid concentration in DS onions, with no significant changes in FS onions. T1 enhanced antioxidant properties in DS onions and reduced them in FS onions. Additionally, T2 and T3 decreased antioxidant activity in both DS and FS onions, as evidenced by DPPH, FRAP, and ABTS tests. These findings guide onion production, advocating for the fresh consumption of DS onions with higher biomass and industrial processing suitability for FS onions, emphasizing the potential of bio-based products.

Mineral fertilizers for onions: a review

For the production of onions, first of all, the proper organization of its nutrition is necessary. Both its productivity and product quality depend on this. First of all, onion nutrition requires mineral fertilizers containing macronutrients such as nitrogen, phosphorus and potassium. The quality of onions, their physiology and productivity depend on the application of nitrogen, phosphorus and potassium fertilizers, the need for which and the efficiency of use by plants vary depending on climatic factors, irrigation systems, varietal differences, soil and production conditions of cultivation in growing areas. This review examines in detail the effect of nitrogen, phosphorus and potassium, as the main components of mineral nutrition, on the growth, physiology and yield of onion. The review includes various databases such as Google Scholar, PubMed, Science Direct, SciFinder, Web of Science, RSCI, etc., online sources (Research Gate, Springer Nature Open Access, Wiley Online Library, etc.) are used.

Improving onion productivity and producer income through nitrogen management

Intensifying nitrogen (N) management can improve yield and bulb quality in onions. A field experiment was conducted to determine the optimum N rate and application frequency for high onion productivity. Treatments comprised levels of nitrogen (N): 50, 100, 150, 200, or 250 kg ha-1, and nitrogen application frequency: all at once, twice, three times, or four times. The N rate and application frequency affected growth performance, bulb characters, yield, and bulb quality of onions. The supplement of 150 kg ha-1 N at three times the application frequencies generated the highest marketable yield (46.5 t ha-1) with the highest net benefit (626317 ETB ha-1). Application of 150 kg ha-1 of inorganic nitrogen with three times the application frequency improves the marketable yield of onions with the highest and most acceptable net benefit. The intensive and economical use of inorganic nitrogen and its frequency of application increased the growth and economic yield of onions in field conditions.

Coping with Water Stress: Ameliorative Effects of Combined Treatments of Salicylic Acid and Glycine Betaine on the Biometric Traits and Water-Use Efficiency of Onion (Allium cepa) Cultivated under Deficit Drip Irrigation.

Freshwater scarcity is a major global challenge threatening food security. Agriculture requires huge quantities of water to feed the ever-increasing human population. Sustainable irrigation techniques such as deficit drip irrigation (DDI) are warranted to increase efficiency and maximize yield. However, DDI has been reported to cause water stress in plants. The study aimed to investigate the influence of the exogenous application of salicylic acid alone (SA) or in combination with glycine betaine (GB) on the growth, yield quality, and water-use efficiency of onions under different DDI treatments (100%, 70%, and 40% field capacity (FC)). Spray treatments (sub-treatments) were as follows: T1: (distilled water), T2: (1.09 mM SA), T3: (1.09 mM SA + 25 mM GB), T4: (1.09 mM SA + 50 mM GB), and T5: (1.09 mM SA + 100 mM GB). Our results indicated that T2 slightly ameliorated the effects of water stress by improved plant heights, leaf number, pseudostem diameter, bulb quality, and nutrient content of onion bulbs, especially under the 70% FC treatment. However, T3 recorded the poorest results on leaf number, pseudostem diameter, and bulb quality under the 70% and 40% FC treatments. Generally, our results indicated that onions could tolerate moderate water stress (70% FC) without severely affecting the growth and yield of onion. In conditions where freshwater is a limiting factor, a DDI treatment of 40% FC is recommended.

Effect of Plant Growth Regulators on Growth and Yield of Onion (Allium cepa L.)

A field experiment entitled “Effect of Plant Growth Regulators on Growth and Yield of Onion ( Allium cepa L.)” was conducted during two consecutive years 2019-20 and 2020-21 in rabi season at Agriculture Research Farm, Veer Bahadur Singh Purvanchal University, Jaunpur( U.P) to study the effect of plant growth regulators on growth and quality of onion ( Allium cepa L.) . The trial was laid down in randomized block design (RBD) with three replications and ten treatments viz. T1- Control- Distilled Water, T2. GA3- 50 ppm, T3. GA3- 100 ppm, T4. GA3- 150 ppm, T5- NAA – 50 ppm, T6- NAA- 100 ppm, T7- NAA – 150 ppm, T8- Kinetin- 50 ppm, T9- Kinetin- 100 ppm, T10- 150 ppm . Study results revealed that, there was significant statistical variation in plant height (cm), Number of leaves per plant , collor width ( cm) collar width (cm ) Polar Diamter ( cm ) Equatorial diameter (cm) , Yield per plot, Marketable yield, Total yield ( q/ ha). Basis on the pooled the data study result revealed that maximum plant height(34.05cm at 30 DAT, 51.15 at 60 DAT and 69.90 cm DAT) , number of leaves(6.60 at 30 DAT, 8.90 at 60 DAT and 13.60 at 90 DAT) , Fourth leaf length ( 23.60 cm at 30 DAT, 45.0 cm at 60 DAT and 48. 93 cm at 90 DAT) fourth leaf width( 0.52at 30 DAT, 1.32 at 60 DAT, 1.70 at 90 DAT) , collor width ( 1.24 m), Equatorial diameter ( 6.35), Polar diameter (5.75 cm), Bulb weight ( 41.02) , Bulb yield per plot ( 2.71 kg), marketable yield ( 257.21) and yield per ha. (270.75q).

Performance of Varieties on the Yield and Quality of Onion (Allium cepa l.) through Set to Bulb Method

An experiment was laid out at farm of Spices Research Sub-Centre (SRSC), Bangladesh Agricultural Research Institute (BARI), Faridpur, Bangladesh during the winter season of 2021-2022. The study comprised 3 new varieties viz. BARI Piaz-4, BARI Piaz-6 and LalTeer King, while BARI Piaz-1 was used in the study as check. The trial was conducted to explore potentialities of new developed varieties for getting higher yield and quality of onion in set to bulb method. The experiment was carried out in randomized complete block design with three replications. The finding depicted that the varieties responded significantly on the parameters studied except days to maturity of bulb and disease rating. The variety BARI Piaz-4 and LalTeer King showed the best performance on the basis of incidence of bolting, split bulb, diameter of bulb, individual bulb weight and yield of onion. On the other hand, BARI Piaz-1 had the highest dry matter content and total soluble solid content against other varieties. Finally, new developed varieties such as BARI Piaz-4 and LalTeer King would be used for getting higher yield of early green onions in set to bulb method.

Impact of transplanting dates, cultivars and zinc on performance of onion (Allium cepa)

An experiment was conducted during winter (rabi) seasons of 2020–21 and 2021–22 at Horticulture farm of Sri Karan Narendra Agriculture University, Jobner, Jaipur, Rajasthan to determine the effect of transplanting date, cultivar and zinc application method on growth, yield and quality of onion (Allium cepa L.). Experiment was conducted in split-plot design and replicated thrice. The treatments consist of 2 transplanting dates, viz. 10th December and 01st January; and 3 cultivars, viz. RO-01, RO-59 and Bhima Shakti were kept in main plot; and in sub- plots, 4 methods of zinc application, viz. control, soil application of ZnSO4 @25 kg/ha, dipping of onion seedlings in zinc solubilizer solution before transplanting and foliage spray of ZnSO4 @0.5% at 30 and 45 days after transplanting were kept. Significantly higher plant growth, bulb yield (416.8, 358.0 and 387.4 q/ha) and quality of onion were recorded in 01st January transplanting date. Among the cultivars, significantly higher plant growth, bulb yield (417.5, 358.4 and 388.0 q/ha) and quality of onion were recorded in Bhima Shakti but these parameters were at par with RO-59. In zinc application methods, significantly higher plant growth, bulb yield (41.5, 35.8 and 38.7 t/ha) and quality of onion were noticed under foliar application of ZnSO4 @0.5% but these were found at par with soil application of ZnSO4. Thus, the conclusion of findings was that the transplanting of Bhima Shakti cultivar on 01st January and with foliar application of ZnSO4 @0.5% had the potential effect to increase onion performance.

Foliar application of chitosan and plant probiotic bacteria influencing the growth, productivity and bulb storage life of onion

Onion having several health promoting phytochemical contents is an important spices in most of the countries of the world as well as vegetables in particular and chitosan and plant probiotic bacteria are few proven natural growth enhancing agents. Here, three bio-stimulants namely Chitosan (100 and 200 ppm), Paraburkholderia BRRh-4 bacteria (1.5 × 109 CFU mL-1) and Clybio (0. 1%) in singly as well as combining one another were applied at twelve different treatment combinations including control with the aim of investigating the below and above ground vegetative growth, bulb productivity and post-harvest storage performance of onion cv. “Taherpuri”. The experiment was set up in Randomized Complete Block Design (RCBD) maintaining three replicates and conducted during November 2019 to June 2020 where the bio-stimulant formulations were sprayed in the foliage at 20, 40 and 60 days after transplanting (DAT). Reproductive behaviors of the onion cultivar differed significantly among the treatments and those were the resultants of statistically varied vegetative performances recorded at 30, 60 and 90 DAT. Chitosan @ 100 ppm + Clybio (0.1%) + Paraburkholderia BRRh-4 (1.5 × 109 CFU mL-1) combination exhibited statistical superiority over the other treatments in terms of plant height (53.230 cm), number of leaves (10.13/plant), leaf length (41.20 cm) and diameter (10.33 mm), number of roots (32.53/plant), root length (12.23 cm), neck and bulb diameter (11.20 mm and 4.83 cm, respectively) and bulbing ratio (0.23) at 90 DAT. While, shoot and root growth didn’t vary significantly at earlier stages (at 30 DAT). Again, the highest yield (3.36 kg/plot and 10.45 t/ha) was also obtained from Chitosan @ 100 ppm + Clybio (0.1%) + Paraburkholderia BRRh-4 (1.5 × 109 CFU ml-1) treatment. The combination of chitosan and probiotic bacteria had significant influence on post-harvest storage qualities of onion where the longest shelf life/marketable life (8.17 months) with the lowest physiological weight loss and bulb rotting at 90 days after harvest was administered in Chitosan @ 100 ppm + Clybio (0.1%) + Paraburkholderia BRRh-4 (1.5 × 109 CFU mL-1) treatment. Besides the best treatment, Chitosan @ 100 ppm + Clybio (0.1%) and Chitosan @ 100 ppm + Paraburkholderia BRRh-4 (1.5 × 109 CFU mL-1) produced statistically superior results over control for onion growth and development. Therefore, chitosan and plant probiotic bacteria can be judiciously used for quality onion production in the warm and humid areas of the world

Effect of Water Hyacinth Compost and Nitrogen, Phosphorus, Potassium, Sulfur Fertilizers on S-Availability, S-Uptake, and Quality and Yield of Onion (Allium ascalonicum L.) on Inceptisols of Jatinangor

Shallots are have a high potential in Indonesian agricultural land. Soil in Indonesia is dominated by Inceptisols, which is low in soil fertility. This can be managed by adding nutrients to soil to increase its fertility, which can have a good effect on quality and crop yields. This experiment's purpose was to find the dosage of water hyacinth compost and N, P, K, S fertilizers that can give the best results for available S, S uptake, quality,and the yield of Batu Ijo variety of shallots in Inceptisols of Jatinangor and were carried out in the Soil Chemistry Laboratory, Plant Nutrition Experimental Garden, Faculty of Agriculture, Padjadjaran University, Jatinangor, Sumedang, West Java, Indonesia from June to September 2020. The experiment used a Randomized Completely Block Design (RCBD) with seven treatments and four replications, namely: control; Recommended N, P, K, S; ¾ Recommendations of N, P, K, S; ½ compost + ¾ dose of N, P, K, S; compost + ¾ dose of N, P, K, S; 1½ compost + ¾ dose of N, P, K, S; and compost + N, P, K, S at dosage of 25 t ha-1 water hyacinth compost, 200 kg urea, 500 kg Ammonium Sulphate, 300 kg SP-36, 200 kg KCl. The results showed that ½ compost + ¾ dose of N, P, K, S gave the best result by increasing S-avallability, S-uptake, aroma, color, number of bulbs, fresh weight, and dry weight of shallots bulbs on Inceptisols of Jatinangor.

Quality and storability of onion (Allium cepa L.) as influenced by varieties and household organic mulches

An experiment was conducted to study the effects of varieties and household organic mulches on growth and yield of onion at the Horticulture Farm of the Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period from October 2020 to March 2021. The experiment consisted of three onion cultivars of Bangladesh viz. Taherpuri, BARI Piaz 1 and BARI Piaz 4, and five household organic mulches, viz. T0 = Control (no mulching), T1 = vegetables wastes, T2 = rice straw, T3 = banana leaf and T4 = water hyacinth. The two-factor experiment was carried out in Randomized Complete Block Design with 3 replications. Results revealed that the parameters under study showed significant variation between onion varieties and mulching. Results showed that the highest percent of weight loss of bulbs (31.19%) was observed in V3T4 followed by V3T1 (29.89%) and the lowest percentage of weight loss of bulbs (24.66%) was observed in V1T1. The highest percentage of dry matter content of bulb (13.13%) was recorded in V3T4 followed by V3T1 (12.54%) and the lowest percent dry matter content of bulb (8.08%) was observed in V1T0. The highest percentage of splitted bulb (10.33%) was observed in V3T4 followed by V3T1 (9.33%) and the lowest percentage of splitted bulb (1.33%) was observed in V1T0 (Table 4). On the other hand, the highest percentage of rotten bulb (9.00%) was observed in V3T0 followed by V2T0 (8.33%) and the lowest percentage of rotten bulb (2.00%) in V1T2. Therefore, the combined use of water hyacinth along with Taherpuri was found to be better with respect to the quality and storability of onion. Res. Agric. Livest. Fish. Vol. 10, No. 2, August 2023: 123-131

Effect of Nutrient Menagement on Growth, Yield and Quality of Onion (Alium cepa L.)

A field experiment was conducted on the Horticulture Research Farm of the RBS College, Bichpuri, Agra during the rabi season of 2016-18. In this experiment eight treatments were tested with three replications in randomized block design (RBD). Treatments were (T1) recommended dose of fertilizer (RDF) (T2) 100% RDF + Azotobacter, (T3) 100% RDF + FYM, (T4) 100% RDF + Azotobacter + FYM, (T5) 80% RDF + Azotobacter + FYM, (T6) 80% RDF + FYM, (T7) 80% RDF + Azotobacter and (T8) control. The application of 100%RDF +Azotobacter + FYM (T4) significantly maximum plant height (50.14cm), maximum number of green leaves (8.65), maximum leaf length(45.53cm). maximum fresh weight of top of plant 45.34gm), maximum fresh weight of bulbs (84.32gm), maximum diameter of bulb (6.9cm) and the highest bulb yield of 33.95 t/ha. were recorded from treatment T4 (100%RDF +Azotobacter + FYM)

Effect of ozone treatment on microbial and quality alteration of onions during 2 months storage.

Storing and preserving onion using pesticides is common in Brebes District. The study determined the use of ozone to reduce microorganisms and to maintain the onion quality during months of post-harvesting. There were three chambers with 2.5 m3 in size, and with a capacity of 20 kg onion used for this study. Each chamber received different treatment for 2 months; chamber I: no treatment; chamber II: pesticide; chamber III: ozone. The ozone treatment maintained better temperature and humidity for preservation. Ozone treatment was also observed to maintain low level of mass damage (1.8%) as compared to control and pesticide (6.5% and 2.4%). The protein, ash, fat and vit B1 of onions were remained high in ozone-treated chamber. Total Plate Count (CFU/mL) and the Mold Yeast Count (colonies/mL) decreased on day 30 and 60 after pesticides and ozone treatment. This study showed the importance of ozone treatment to maintain better quality of onion after months of storage as compared to pesticide treatment. Therefore, ozone can be a potential use to replace the pesticide for preservation at post-harvesting.