Onion Cv Research Articles

Effect of Irrigation Scheduling and Intercropping Pattern on Growth, Yield, Quality of Green Onion, Lettuce and some Water Relations in North Nile Delta Region

Two field trials were performed at Sakha Agricultural Research Station Farm, Kafr El- Sheikh Governorate, during the two winter seasons 2017/18 and 2018/19 to study the influence of irrigation scheduling; traditional watering (I1), irrigation at 1.2(I2), 1.0(I3) and 0.8(I4) of accumulative pan evaporation(APE) and four systems of sole and intercropping pattern; sole green onion cv. Giza 6(P1), sole lettuce cv. Balady(P2), 2green onion : 1 lettuce(P3) and 1 green onion : 2 lettuce(P4) in a split plot design with four replications. Data indicated that the highest values for seasonal applied water (AW) and water consumptive use (CU) were registered under irrigation treatment(I2). For water consumptive use efficiency (Ecu%), the highest values were recorded under treatment (I1). productivity of irrigation water (PIW) and water productivity (WP) were clearly impacted by irrigation treatments, intercropping patterns in addition crop type where the highest values also recorded I2 besides P4. The results also revealed that yield, yield component and quality parameters for green onion; plant height, fresh weight of leaves, plant weight, leaf area/ plant, chlorophyll content and total yield as well as lettuce; plant height, leaf area/ plant, chlorophyll content, plant weight, head weight, diameter and total yield increased with increasing irrigation applied water. On contrary, for crop pattern the highest values for yield component recorded under sole crop but the total yield recorded under 1:2green onion- lettuce planting pattern. For gross return and increasing income was attained I2 besides P4. Land equivalent ratio (LER) exhibited higher values with I1 besides P4.

Effect of scape regulation on seed yield and quality in onion (Allium cepa)

Flowering plants often produce less seed than the number of flowers they produced. A field experiment was conducted to study the effect of the scape regulation on seed yield and quality in onion (Allium cepa L.) cv. Pusa Ridhi during rabi 2015-16 and 2016-17, at Unit of Vegetable Research and Demonstration Unit (UVRDC), ICARIndian Agricultural Research Institute, New Delhi. Onion plants producing six scapes/plant were selected and thescape numbers were regulated from 1-6/plant. The results from the present experiment reveal that, scape regulation significantly influences the seed quality. The scape length, umbel diameter was significantly higher by 13.36% and 25.65% respectively, in plants up to three scapes/plant, in comparison to plants with six scapes/plant. Highest number of florets/flower was found in plants with one scape/plant, which was 50.47% higher than the plants with six scape/plant. Plants with single scape produced 88.78% more seed yield/umbel in comparison to plants with six scapes/plant. Seed quality parameters like 1000-seed weight, speed of germination, seedling vigour were higher in plants up tofour scapes/plant. Though there was reduction in the overall yield but the reduced yield is likely to be compensated by high seed vigour which may lead to higher filed emergence. It is suggested that during seed production of onion maximum of four scapes may be retained to obtain seeds with high quality.

Effect of potassium and sulphur on soil properties and growth and yield of onion (Allium Cepa l.) cv. Nasik red

Effect of potassium and sulphur on soil properties and growth and yield of onion (Allium Cepa l.) cv. Nasik red

An Effect of Growth Regulators on Restriction of Umbel Orders in Seed Production of Onion cv CO (On) 5

An Effect of Growth Regulators on Restriction of Umbel Orders in Seed Production of Onion cv CO (On) 5

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Mulches enhanced growth and yield of onion

The experiment was conducted to investigate the effect of mulches on soil nutrients and microclimate status, growth and bulb yield of onion cv. Taherpuri. The experiment was comprised of six mulches viz., i) Control (no mulch), ii) Black polythene sheet, iii) White polythene sheet, iv) Rice straw, v) Water hyacinth and vi) Saw dust. Application of different mulches improved soil microclimates, increased plant growth and bulb yield over control. Among the mulches, black polythene mulch showed superiority in growth and yield contributing characters compared to other mulches, resulting the highest bulb yield.Bangladesh J. Sci. Ind. Res.53(4), 305-310, 2018

Effect of nitrogen and off season bulb size on onion seed production

An experiment was conducted at Sukranagar, Chitwan to assess the effect of nitrogen (N) and off season bulb size on seed production of onion cv. Bemausami-1 (N-8293) during 2009/10. Five levels of nitrogen (0, 40, 80, 120 and 160 kg N/ha) as main plot factor and three bulb size (<1, 1-3 and >3 cm diameter) as sub plot factor were used as treatments and laid out in a split plot design with three replications. Plant height, number of tillers, leaves; scapes, umbels, and flowers per plant were significantly high at higher doses of nitrogen and similar results were found at the bigger sized bulb too. Seed yield was the highest (300.2 kg/ha) at 160 kg N/ha and >3 cm bulb size and the lowest (200.1 kg/ha) at 0 kg N/ha and <1 cm bulb size. B: C ratio was the highest (1.79) at 160 kg N/ha with medium sized bulb (1-3 cm) and the lowest (1.05) at 0 kg N/ha with bulb size of < 1 cm.Journal of the Institute of Agriculture and Animal Science. Vol. 33-34, 2015, Page: 41-46

Onion yellow dwarf virus ∆∆Ct-based relative quantification obtained by using real-time polymerase chain reaction in ‘Rossa di Tropea’ onion

As part of a plant-pathogen interaction study between Onion yellow dwarf virus (OYDV) and onion cultivar Rossa di Tropea, a ΔΔCt-based relative quantification of OYDV was investigated to relate OYDV titer to accumulation of secondary metabolites in onion bulbs. An appropriate reference gene (RG) was required to achieve data normalization. Since no single internal control gene is universally used as an RG, multiple stably expressed reference genes were investigated. In particular, elongation factor (Elf), protein phosphatase 2A (PP2A), helicase (Hel-1), 5.8S rRNA, ubiquitin (UBQ) and s-Actin (s-Act) were compared one to another in both leaf and bulb tissues, at different growth and development stages, and with different infection status (healthy/OYDV-infected). Preliminary gene screening was carried out using an RT-qPCR assay (SYBR chemical), assessing both Ct values and melting curves. Expression stability of the reference genes in the sample sets was independently determined by three different software packages: geNorm, NormFinder and Bestkeeper. In contrast to Elf, PP2A, Hel-1 and s-Act, 5.8S rRNA and UBQ proved to be the most stable RGs. An OYDV specific RT-qPCR TaqMan® assay was also developed and validated for relative quantification of OYDV titer. The assay was shown to be specific and sensitive, able to identify virus presence up to 10−6 dilution, representing a rapid and sensitive diagnostic tool for OYDV detection for application in field surveys. Finally, a ∆∆Ct method was developed, to be applied in future studies describing the molecular interaction between OYDV and onion cv. ‘Rossa di Tropea’. This approach was used to provide relative quantification of OYDV titer in samples obtained from different experimental trials.

Foliar spray of mineral nutrients enhanced the growth, seed yield, and quality in onion (Allium cepa L.) cv. Pusa Riddhi

ABSTRACTThe present experiment was conducted to investigate the effect of foliar spray of mineral nutrients on plant growth, seed yield, and quality attributes in onion cv. Pusa Riddhi at SPU, IARI, New Delhi during rabi 2013–14 and 2014–15. The experiment consisted of 16 treatments comprised of boron, zinc, calcium, and magnesium laid out in a completely randomized block design with two replications. The study revealed that the foliar zinc spray (625 g ha−1) produced higher seed scape height (105.35 cm) along with lower disease incidence (8.50%) than the other treatments. Whereas, higher number of seed scapes plant−1 (11.20) and productive seed scapes plant−1 (8.58) were observed in T10 (500 g ha−1) and combined spray of B + Zn + Ca (T14), respectively. The flowering traits, viz., umbellates umbel−1 (642.45), productive umbellates umbel−1 (579.35), and umbel diameter (7.38cm) were significantly (p ≤ 0.05) higher in T15 than other treatments. Similarly, higher seed yield and seed quality attributes were also observed in combined application of all minerals treatment (T15).

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Effect of various plant density at different levels of phosphorous and potash on growth and seed yield of onion (Allium cepa L.) cv. Hisar-2

A field experiment was carried out at Research Farm of the Department of Vegetable Science, CCS Haryana Agricultural University, Hisar (Haryana) during rabi season of 2013-14 and 2014-15 to investigate the effect of fertilizers and plant spacing on growth and seed yield of onion. The treatments comprising of three fertilizers levels (F1: 75% recommended dose of phosphorous and potash, F2: 100% recommended dose of phosphorous and potash and F3: 125% recommended dose of phosphorous and potash) and four plant spacing (S1: 45x30 cm, S2: 45x45 cm, S3:60x30 cm and S4: 60x45 cm) were laid out in randomized block design (factorial). The results of the experiment showed that different fertilizers levels and plant spacing influenced the growth and seed yield of onion significantly. The crop planted at 60x45 cm spacing and supplied with 125% recommended dose of phosphorous and potash resulted in maximum number of umbels per plant and number of seeds per umbel, while the crop planted at 45x30 cm spacing and supplied with 125% recommended dose of phosphorous and potash resulted in highest length of leaves, length of flower stalk and seed yield per hectare during both the years.

Effect of plant bio-regulators on the growth, yield and physico- chemical characteristics of onion (Allium cepa L.)

This experiment was held to study about the efficacy of concentration of plant bio regulators on vegetative growth, yield and quality characters of onion cv. NHRDF-RED-2 under Lucknow subtropical condition having dry climate and high pH soil (8.2). The experiment comprised of 13 treatments [Control (water spray), GA 3 @ 50, 100 ppm, 150 ppm; NAA @ 50 ppm, 100 ppm, 150 ppm and combination of GA 3 and NAA] laid out in the Randomized Block Design with three replications. The observations revealed that the application of T 11 [GA 3 @ 100 ppm + NAA @ 100 ppm] was better for improvement of growth i.e. plant height (76.50 cm), number of leaves (8.27), length of leaves (60.60) and basal diameter (2.05 cm) at 90 DAT. It also recorded the highest bulb yield (60.34 t/ha), fresh weight (90.51 g), dry weight (10.89 g), diameter (6.87 and 6.87 cm equatorial and polar, respectively) of onion bulb. Similarly, chemical properties like TSS (12.03° B) and pH (6.99) was found better under treatment T 11 (GA 3 @ 100 ppm + NAA @ 100 ppm) followed by T 9 (GA 3 @ 50 ppm + NAA @ 150 ppm). Thus, the study suggested that combined application of bio regulators (GA 3 @ 100 ppm + NAA @ 100 ppm) may be followed to get better growth, yield and quality of onion cv. NHRDF-RED-2 under drier subtropical climate.

Effect of organic manures, biofertilizers and micronutrients on growth, yield and quality of onion (Allium cepa L.)

A field experiment was conducted during the Rabi season to find out the effect of organic manures, biofertilizers and micronutrients on growth, yield and quality of onion cv. NHRDF Red - 2. There were 13 treatments viz. , T 0 (Recommended dose of fertilizers), T 1 Poultry manure, T 2 vermicompost, T 3 Azotobacter , T 4 VAM, T 5 Azotobacter +RDF (50%)+zinc, T 6 Azotobacter +RDF(75%)+zinc, T 7 VAM+RDF(50%)+boron, T 8 VAM+RDF (75%)+boron, T 9 RDF (25%)+VAM+poultry manure (50%)+ Azotobacter +boron, T 10 (RDF (25%)+VAM+vermicompost (50%)+ Azotobacter +boron, T 11 RDF (25%)+VAM+poultry manure (50%) Azotobacter +zinc, T 12 RDF (25%)+VAM+vermicompost 50% Azotobacter +zinc and the experiment was laid out under RBD with three replications. The study clearly revealed that there were significant effects of various treatments on the growth, yield and quality attributes of onion. The number of leaves per plant (12.15), plant height (73.02cm), neck thickness (22.00mm), bulb length (6.46 cm), bulb diameter (7.20cm), yield (398.36 kg/ha -1 ) were recorded maximum in treatment T 12 whereas T.S.S (14 °B), vitamin C (12.11mg/100g), total sugars (10.52%), reducing sugar (6.23%) and non-reducing sugar (4.28%) were found maximum in T 10 treatment as compared to other treatment. However, T 12 was good for higher yield improvement and T 10 was the best for quality improvement among the all treatments under study, the application of T 12 (RDF (25%)+VAM+Vermicompost 50% Azotobacter +Zinc) may be suggested for successful cultivation of onion in Lucknow.

Assessment of the Effect of different Levels of Nitrogen and Plant Spacing on Growth, Yield and Quality of Onion (Allium cepa L.) cv. Agrifound Light Red

Assessment of the Effect of different Levels of Nitrogen and Plant Spacing on Growth, Yield and Quality of Onion (Allium cepa L.) cv. Agrifound Light Red

Effect of foliar application of micronutrients on growth and yield of onion (Allium cepa L.) c.v. Agri found dark red

A field experiment was conducted to determine the effect of foliar application of micronutrients on growth and yield of onion( Allium cepa L.) cv. Agri found dark red during kharif season of 2014-2015 at Horticulture Research Farm, Department of Horticulture, R.A.K. College of Agriculture, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Sehore (M.P.). The experiment was laid out in randomized completely block design with three replications. The treatments consists of foliar sprays of 4 micronutrients , viz., Zn, Mn, B and Cu alone and in combination T1–Zn (0.5%), T2 -Mn (1.0%), T3 -B (0.25%), T4 -Cu(1.0%), T5 -Zn + Mn (0.5 + 1.0%), T6 -Zn + B( 0.5 + 0.25%), T7 -Zn + Cu (0.5 + 1.0%), T8 -Zn+ Mn+ B+ Cu (0.5 + 1.0 + 0.25 + 1.0%), T9 –Control. Treatment T3 -B (0.25%) was recorded the maximum 394.86 q ha-1 bulb yield followed by T8- Zn+ Mn+ B+ Cu (0.5 + 1.0 + 0.25 + 1.0%) 333.32 q ha-1. Highest net return of Rs 3,45,355 ha-1 with benefit cost ratio 7.98 was obtained in treatment T3 -B (0.25%).

Effect of storage conditions, packing materials and seed treatments on viability and seedling vigour of onion (Allium cepa l.) seeds

The present investigation was carried out from July 2013 to July 2015, wherein 100 g of fresh quality seed of onion cv. GWO 1 was having high germination percentage and moisture content below 8 per cent. The treatment consisted of two storage conditions (C) viz., C1 (Ambient temperature) and C2 (Cold storage at 70C + 20C); two packing materials (P) viz., P1 = Cloth Bag and P2 = Polythene Bag (500 gauge = 125 µ), and five seed treatments (S) viz., S1 = Control, S2 = Carbendazim @ 2g/kg seed, S3 = Mancozeb @ 2g/kg seed, S4 = Thirum @ 3g/kg seed, and S5 = Neem leaf powder @ 10g / kg seed. After proper mixing or smearing the seeds as per the treatments, seeds were packed and stored as per treatments. Observations were recorded at 90 days interval on viability and vigour parameters. The results revealed that seed stored under cold storage (7±2 °C) and in polyethylene bags (500 gauge) noted significantly higher values for all the characters even after two years of storage. All the treatment combinations of seed stored under cold storage gave more than 70 per cent germination (As per ISTA standard) even after two years of storage, of which, seed treated with thirum @ 3g/kg seed was the best treatment. Therefore, it can be concluded that seed of onion can be stored up to two year in cold storage packed in polyethylene bag without or with seed treatment without deterioration in germination and seedling vigour.

Effect of date of transplanting and mulching on growth, yield and quality of onion (Allium cepa L.) cv. Nasik Red

A field experiment was conducted during rabiseason of 2014-2015 at Department of Applied Plant Sci-ence (Horticulture), Baba saheb Bhimrao Ambedkar University, Lucknow-226025 (U.P.) India to find out the effect of different dates of transplanting and mulching on growth, yield and quality of onion (Allium cepa L.) cv. Nasik Red. There were 16 treatments comprising 4 dates of transplanting (15th November, 1st, 15th and 30th December) and 3 mulching (saw dust, rice husk and wheat straw) while, without mulching as control and laid out under two factor RBD with three replications. The study clearly revealed that there were significant effects of all treatments on vegetative growth, yield and quality attributes of onion. Plant height (65.34 cm), number of leaves per plant (8.89), length of leaves (56.07 cm), neck thickness (18.75 mm), yield (5.166 kg/plot and 387.46 q/ha) were found maximum at 1st December planting with wheat straw mulching (T7). The best quality bulb in respect of maximum neck thickness (12.35 mm), basal diameter (13.61.mm), diameter of bulb (54.41 mm polar and 64.15 mm equatorial), length of bulb (65.17 mm), number of scales per bulb (9.24), bulb moisture (85.06 %) T.S.S. (13.84 oBrix), ascorbic acid (10.47 mg/100g), total sugars (10.39 %) etc. were also obtained when mulching was done with wheat straw and transplant-ed on 1st December (T7) followed by T6 (planted on 1st December and mulching with rice husk). The study clearly concluded that i.) mulching is good for production of onion, ii.) late transplanting on 30th December showed very poor performance irrespective of mulching and iii) transplanting on 1st December and mulching with wheat straw was the best combination for getting good quality yield of onion.