Seasonal plant growth, leaf and bulb mineral nutrients, and bulb yield and quality under chemical, mixed, and organic fertilization in sweet onion (Allium cepa L.)

Vidalia onions (Allium cepa L.) are sweet, short-day, low pungency, yellow Granex-type bulbs that are popular in the United States because of their mild flavor. There are limited studies on sweet onion plant growth in response to organic fertilization rate. The objective of this report was to evaluate the effects of organic fertilizer rates on sweet onion plant growth, and leaf and bulb mineral nutrients. Experiments were carried out at the Horticulture Farm, Tifton Campus, University of Georgia, in the Winters of 2012–13 and 2013–14. There were five treatments [organic fertilizer 3–2–3 equivalent to 0, 60, 120, 180, and 240 kg·ha−1 nitrogen (N)]. During the season and at the mature plant stage, root, stem, and bulb biomass increased whereas the root-to-shoot ratio decreased with increasing fertilization rate up to 120 kg·ha−1 N. Foliar concentrations of N and Ca decreased whereas Cu concentration increased with increasing organic fertilization rate. Bulb Mg and Mn increased whereas P and Cu decreased with increasing organic fertilization rate. The accumulation of mineral nutrients by onion whole plants increased quadratically (N, P, K, and S) or linearly (Ca and Mg) with increasing fertilization rate. The N use efficiency decreased with increasing organic fertilization rate; the agronomic efficiency of N (AEN) decreased quadratically and the marginal yield decreased linearly with increasing fertilization rate. Chlorophyll indices (CI) were highest with 240 kg·ha−1 N and lowest with 0 kg·ha−1 N. In conclusion, onion plant growth increased with increasing organic fertilizer rate probably because of augmented soil N levels. Observation of nutrient deficiencies late in the season, even at high organic fertilization rates, indicates that preplant application of organic fertilizer was sufficient to cover plant nutritional needs only partially and that applications of N fertilizer later in the season may be necessary. High application rates of organic fertilizer (above those required by the crop) may have resulted in significant N leaching because it is unlikely that the crop used most of the N that was mineralized. Bulb concentrations of P, K, Ca, Mg, S, B, Fe, Cu, and Mn were higher compared with values reported in the literature for onions produced with inorganic fertilizers.

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Effect of Sowing Dates and Botanical Seed Pelleting on Plant Growth, Bulb Yield and Quality of Onion (Allium cepa L.)

Agricultural Science Digest - A Research Journal ◽

10.18805/ag.d-5183 ◽

2020 ◽

Author(s):

Abhishek Panwar ◽

Ashok K. Thakur ◽

Pramod Sharma ◽

Shivangi Negi ◽

Cherry Nalwa ◽

...

Keyword(s):

Plant Growth ◽

Plant Height ◽

Growth Yield ◽

Melia Azedarach ◽

Yield And Quality ◽

Sowing Dates ◽

Allium Cepa L ◽

Leaf Powder ◽

Bulb Yield

Background: Onion (Allium cepa L.) is a major bulbous vegetable as well as condiment of family Alliaceae grown in India, originated in Iran and Pakistan. Seed pelleting is a mechanism of applying various materials to the seed that can enhance the seed quality with respect to physiological, physical and health attributes. Seed pelleting make it easy to handle small and irregular shaped seeds.Methods: The present investigation was conducted in the field of Department of Seed Science and Technology, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni, Solan during seasons of 2016-17 and 2017-18. Result: This experiment comprised of pelleted seeds with different botanicals carried out to determine the effect of sowing dates and seed pelleting and their interactions on plant growth, yield and quality of bulb crop. All the factors in the experiment as well as their interactions showed significant influence on plant growth, yield and yield contributing characters in onion. The seeds pelleted with Azadirechta indica leaf powder + clay and Melia azedarach leaf powder + clay sown directly showed maximum values w.r.t. emergence (91.50 %), plant height at 60 days after sowing (35.35 cm), average leaf length (38.43cm), number of leaves per plant (8.67), number of days to harvesting (233.49), polar diameter (46.72 mm), equatorial diameter (57.77 mm), bulb size index (2699.74 ), neck thickness (12.12 mm), number of bulb per plot (89.00) average bulb weight (75.24 g), bulb yield (6.67 kg per plot or 400.01 q per ha), plant height before neck fall stage (58.55 cm). From the present studies, it can be concluded that onion seeds pelleted with Azadirechta indica leaf powder + clay and Melia azedarach leaf powder + clay showed significant effects for enhancing bulb quality, growth, quality and yield of bulb crop raised through direct seeding.

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Effect of Application Rate of Urea on the Growth, Bulb Yield and Quality of Onion (Allium Cepa L.) Grown under Semiarid Conditions of North Jordan

Jordan Journal of Agricultural Sciences ◽

10.12816/0039718 ◽

2017 ◽

Vol 13 (1) ◽

pp. 93-102

Author(s):

Jalal A. Al-Tabbal ◽

Malak M. Angor ◽

Radwan Y. Ajo

Keyword(s):

Allium Cepa ◽

Application Rate ◽

Yield And Quality ◽

Allium Cepa L ◽

Bulb Yield ◽

Semiarid Conditions

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Growth, bulb yield and quality of onion (Allium cepa L.) as influenced by nitrogen and phosphorus fertilization on vertisol. II: Bulb quality and storability

African Journal of Agricultural Research ◽

10.5897/ajar10.1025 ◽

2012 ◽

Vol 7 (45) ◽

pp. 5980-5985 ◽

Cited By ~ 8

Author(s):

Tekalign T ◽

Abdissa Y ◽

M Pant L

Keyword(s):

Allium Cepa ◽

Phosphorus Fertilization ◽

Nitrogen And Phosphorus ◽

Yield And Quality ◽

Allium Cepa L ◽

Bulb Yield

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The Effect of True Shallot Seed (TSS) Varieties and Population on Growth and Bulb Yield

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-585 ◽

2020 ◽

Author(s):

Nirmala F. Devy ◽

Hardiyanto . ◽

Jawal A. Syah ◽

R. Setyani ◽

Puspitasari .

Keyword(s):

Plant Growth ◽

Plant Height ◽

Allium Cepa ◽

Plant Populations ◽

Dry Land ◽

Allium Cepa L ◽

Two Factors ◽

Main Plot ◽

Bulb Yield ◽

Plot Design

Background: The purpose of this research was to evaluate the growth and bulb yield of shallot (Allium cepa L.) varieties grown by TSS with different population.Methods: This study was carried out in the low dry land at Laleten Village, Malaka District, NTT Province, Indonesia, from March to August 2018. We investigated different plant populations per planting hole using a split-plot design with two factors and four replications. The main plot was the varieties (Trisula and Bima Brebes) and the subplots were the seedling population (100, 200 and 300 plants/m2).Result: There was no interaction between varieties and population for any of the measured parameters. The population only affected the plant height at the beginning of plant growth. A high plant population (300 plants/m2) gave the highest production of single bulbs but was negatively correlated with the bulb weight. Trisula variety produced significantly more single bulbs than the Bima Brebes one. The establishment of the TSS-adapted varieties could be recommended in this area.

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Response of Plant Growth Regulator on Bulb Yield of Onion (Allium cepa L.)

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-5858 ◽

2021 ◽

Author(s):

Archana Kale ◽

Javed Shaikh ◽

Ravi Chandra Sharma ◽

S. Ghawade

Keyword(s):

Plant Growth ◽

Plant Growth Regulators ◽

Allium Cepa ◽

Growth Regulators ◽

Growth Regulator ◽

Plant Growth Regulator ◽

Protein Hydrolysate ◽

Seaweed Extract ◽

Allium Cepa L ◽

Bulb Yield

Background: Maharashtra ranks first in onion (Allium cepa L.) production with a share of 28.32%. However, the productivity of onion is low as compared to other countries. In order to enhance onion productivity, new and innovative agri-inputs are being tried continuously like providing humic acid, fulvic acid, plant growth regulators (PGR), auxin/amino acid spray, seaweed extract, biofertilizers, sulphur application etc. PGRs are considered to be one of the novel inputs that can help in increasing the productivity of onion in India economically. Plant growth regulators are considered as a new generation of agrochemicals when added in small amounts, modify the growth of the plants usually by stimulation or modifying one part of natural growth regulatory system, thereby increasing the crop yield. Most of the research data available is based on biochemical, seaweeds etc. Almost negligible literature is available pertaining to a PGR made with formulation of Seaweed extract and Protein Hydrolysate. An attempt has been made in this research work to evaluate the effect of PGR formulated with seaweed extract and Protein Hydrolysate as major constituents on onion bulb yield through both foliar and drenching application. Methods: A field experiment for evaluating the effect of plant growth regulator (PGR) formulated by Research and Development Department, M/s Rashtriya Chemicals and Fertilizers Limited was conducted at Chilli and Vegetable Research Farm, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola (MH). During the experiment, the effect of different concentration of PGR viz., 0.2%, 0.4%, 0.6% and 0.8% and 1.0%, 1.2%, 1.4% and 1.6% through foliar and drenching application, respectively were studied. Result: Statistically, significant results of plant growth regulator application on vegetative growth, yield and qualitative characters of onion crop were observed. Significantly, maximum bulb yield was observed in the treatment PGR @ 0.6% (255.41 kg/ha) through foliar application which is at par with the treatment PGR @ 1.4% (246.67 kg/ha) through soil drenching along with RDF. According to the results, the suitable PGR dose for studied characters of onion under prevailing conditions was 0.6% foliar spray and 1.4% soil drenching along with recommended dose of fertilizers.

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