nitrogen · Growth · Allium cepa (onion)

Results differ81 papers: 71 positive, 10 negative or no effect · 1 pair of papers confirmed to differ

138 claims from these papers; 22 citations between them.

Papers whose results differ, checked claim by claim 1

1 pair of papers on this question report results that differ: an effect in one paper, the opposite effect or no effect in the other. Two model reviewers reading both claims accepted each pair.

Optimal Rate of Nitrogen and Intra-Row Spacing for Economical Production of Onion under Irrigated Farming System in Eastern Amhara Region, Ethiopia (2019)
increase123 kg ha-1 nitrogen increased onion leaf number by 67.3%.
Applied Nitrogen Fertilization and Irrigation on Improving Shallot (Allium ascolanicum L.) Growth and Yield on Dry Land in Mesuji, Lampung Province, Indonesia (2023)
no changeNitrogen fertilizer did not significantly affect leaf number or canopy cover.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →

How these papers cite each other

22 citations between these papers: 15 on the same side, 7 across the two sides.

Positive result
Negative result or no effect
Citation, pointing to the cited paper
Citation across the two sides
Larger circle: more citations overall

Years run left to right. Citations come from the papers’ OpenAlex reference lists. Hover a paper to bring forward its citations; click it to open the paper.

Papers reporting a positive result 71

Interaction of Nitrogen Nutrition and Photoperiod as Expressed in Bulbing and Flower-Stalk Development of Onion · 1945
- positive
  Near the critical photoperiod, the lowest nitrogen concentration gave greatest onion bulb development.
  compared with highest concentration
- no effect
  Above the critical bulbing photoperiod, nitrogen amount did not change onion bulb development.
cited by 4 papers here
Effects of nitrogen supplied for the various stages of growth, on the growth and yield of onions in the sand culture · 1959
- positive
  Nitrogen resumed in late February or early March rapidly restored top growth.
cites 1 paper here
Effects of adding plant nutrients to the gel carrier used for fluid drilling germinating lettuce and onion seeds · 1983
- positive
  Ammonium phosphate in gel increased onion seedling dry weight.
  compared with germinating seed control
EFFECTS OF MYCORRHIZAL INFECTION ON PLANT GROWTH, NITROGEN AND PHOSPHORUS NUTRITION IN GLASSHOUSE‐GROWN ALLIUM CEPAL. · 1986
- positive
  Increased N supply increases N inflow, N concentration in plant tissues and plant growth in Allium cepa, except in severely P-limited plants.
Consequences of not fertilizing onions on organic soils with high soil test values · 1988
- positive
  Nitrogen stimulated early onion development.
Sulfur-coated Urea as a Slow-release Nitrogen Source for Onions · 1988
- positive
  large bulb (> 76 mm in diameter) was higher with SCU than preplant urea under low N
  compared with preplant urea
cited by 2 papers here
Onion Plant Growth, Bulb Quality, and Water Uptake following Ammonium and Nitrate Nutrition · 1991
- positive
  Nitrate alone or with NH4-N increased root fresh and dry weight and bulb dry weight of onion compared with NH4-N as the sole N source.
  compared with NH 4 -N as the sole N source
- positive
  Nitrate alone or with NH4-N increased leaf fresh weight, leaf dry weight and leaf area of onion compared with NH4-N as the sole N source.
  compared with NH 4 -N as the sole N source
cites 3 papers herecited by 1 paper here
Seed evaluation after cryopreservation in onion (Allium cepa L.) cultivars · 1995
- positive
  Cryopreservation at −180°C can almost completely control the decline in onion seed germination and seedling vigour caused by storage at room temperature.
  compared with storage at RT
NITROGEN FERTILIZATION OF ONION IN SANDY SOILS · 1998
- positive
  Soil plus high-level foliar N significantly increased fresh and dry weights of the whole onion plant compared with foliar urea only.
  compared with foliar application of urea only
Response of Rabi Onion cv. Nasik Red to nitrogen and Potassium Fertilizer · 2001
- positive
  At 120 kg N/ha onion bulb weight was highest at 115.93 g.
- positive
  At 120 kg N/ha onion bulb diameter was highest at 6.47 cm.
EFFECT OF VAM AND INORGANIC FERTILIZERS ON GROWTH AND YIELD OF ONION (ALLIUM CEPA L.) · 2002
- positive
  Dry bulb weight was highest with VAM + N + P + K, with efficient response at reduced N and P dose.
- positive
  Plant height reached 56.33 cm under VAM + N + P + K, a 59.2% increase.
- positive
  Shoot girth under VAM with 50% reduced N and P was similar to full N + P + K.
  compared with N + P + K
- positive
  Fresh bulb weight was highest with VAM + N + P + K.
- no effect
  Vertical bulb diameter was not strongly affected.
Onion seedling production in styrofoam trays under controlled environment, as summer-planted onions · 2003
- positive
  Nitrogen application three times weekly increased plant height.
- positive
  Nitrogen application three times weekly increased leaf dry weight.
EFFECT OF NITROGEN DOSES ON GROWTH AND YIELD OF ONION (ALLIUM CEPA L.) CV. ‘NASIR RED’ · 2007
- positive
  At 150 kg N/ha, pseudostem diameter was maximal versus lower doses.
- positive
  At 150 kg N/ha, onion plant height was maximal versus lower doses.
- positive
  At 150 kg N/ha, bulb diameter was maximal versus lower doses.
cited by 1 paper here
Irrigation and nitrogen requirement of onion · 2008
- positive
  Fertilizer N increased larger bulb contribution.
- positive
  Fertilizer N improved plant height and leaf area index.
Relationship between growth, yield and storability of onion (Allium cepa L.) with fertilization of nitrogen, sulphur and copper under calcareous soil conditions. · 2009
- positive
  High nitrogen increased dry weight of different onion plant organs (roots,leaves, bulbs and total dry weight).
- positive
  High nitrogen increased pl ant height.
- positive
  High nitrogen increased number of leaves /plant.
cited by 2 papers here
Effect of N and S supply on growth and organo-sulfur compounds of Zhangqiu spring onion. · 2009
- positive
  N supply promoted spring onion plant growth.
- negative
  Excessive N supply retarded spring onion plant growth.
Effect of nitrogen and phosphorus on growth and bulb yield of kharif onion (Allium cepa L.) crop raised through sets in the lower hills of Himachal Pradesh · 2010
- positive
  Onion plant height rose linearly with nitrogen levels.
- positive
  Onion leaf number was highest at 125 kg N/ha.
Growth, bulb yield and quality of onion ( Allium cepa L.) as influenced by nitrogen and phosphorus fertilization on vertisol I. growth attributes, biomass production and bulb yield · 2011
- positive
  69 kg N ha-1 increased plant height by about 10.
  compared with unfertilized check
- positive
  92 kg N ha-1 increased Number of leaves by about 8%.
  compared with control
- positive
  69 kg N ha-1 increased leaf length by 11.5%.
  compared with unfertilized check
- positive
  69 kg N ha-1 increased total dry biomass by 20%.
  compared with control
cited by 5 papers here
GROWTH, YIELD AND STORABILITY OF ONION AS INFLUENCED BY POTASSIUM FERTILIZER APPLICATION TIME AND UREA AS FOLIAR SPRAY · 2011
- positive
  Raising foliar urea from 2 to 4 or 6 g/l significantly increased height and fresh and dry weight at both growth stages.
  compared with 2
Effect of Organic fertilizer and Mineral fertilizer on some properties of Soil , growth and Onion ( Allium cepa L.) yield. · 2011
- positive
  Treatment T2 gave the best germination percentage, plant height and leaf number of onion.
- positive
  Treatment T1 gave the best germination percentage, plant height and leaf number of onion.
Irrigation scheduling at specific growth stages of onion (Allium cepa L.) under variable fertilizer rates in different soil types in Gumselassa (Tigray), Ethiopia · 2012
- positive
  Increasing N rates significantly increased plant height.
PRODUCTIVITY AND QUALITY OF TWO ONION CULTIVARS UNDER ORGANIC, SLOW RELEASE AND MINERAL FERTILIZERS · 2012
- positive
  Mineral nitrogen at 90 kg N/fed gave highest significant growth values.
Response of onion (Allium cepa L.) to crop geometry and nitrogen levels · 2013
- positive
  150 kg nitrogen significantly raised plant height compared with lower doses.
  compared with lower levels
Standardization of the optimum dose of NPK for onion (Allium cepa L.) cv. Phule Samarth · 2014
- positive
  Nitrogen at 200kg/ha produced the highest number of leaves, 43.13, at 115 DAP.
- positive
  Nitrogen at 200kg/ha produced the highest plant height, 96.04 cm, at 115 DAP.
Effect of Different N,P,K Dosage on Dry Matter Accumulation and Yield of Onion · 2014
- positive
  T1 promoted onion plant height, leaf number and growth.
Effect of different doses of nitrogen and sulphur on growth, yield and quality of onion (Allium cepa) · 2014
- positive
  Nitrogen at 120 kg/ha maximized bulb yield and size.
cites 1 paper here
Growth Parameters of Onion (Allium cepa L. var. Cepa) as Affected by Nitrogen Fertilizer Rates and Intra-row Spacing Under Irrigation in Gode, South-Eastern Ethiopia · 2015
- positive
  The longest onion plants were at 15 cm spacing and 138 kg N ha-1, with the shortest at 7.5 cm without nitrogen.
  compared with 7.5 cm intra-row spacing without N fertilizer application
- positive
  The longest onion leaves were at 15 cm spacing with 138 kg N ha-1 and the shortest at 7.5 cm without nitrogen.
  compared with 7.5 cm intra-row spacings without N fertilizer
cites 1 paper here
Nitrogen requirements at bulb initiation for production of intermediate-day onions · 2016
- positive
  Bulb dry matter increased linearly with N rate at harvest (114 DAT) in intermediate-day onion.
- positive
  Bulbs from plants fertilized with 40-60 kg ha-1 N were larger in diameter (8.2-8.5 cm) than bulbs from plants with no N at bulbing (7.2 cm).
  compared with no N at bulbing
- positive
  Leaf dry matter increased linearly with N rate during bulb growth (85 DAT) in intermediate-day onion.
- no effect
  Nitrogen application did not affect root length density or rooting depth during later stages of bulb development in intermediate-day onion.
cites 1 paper here
Agronomic and Economic Evaluation of Nitrogen Fertilizer Rates and Intra Row Spacing on Growth and Bulb Yield of Onion (Allium cepa L.) under Rainfall Condition · 2016
- positive
  Increasing nitrogen from 50 to 100 kg N ha -1 increased leaf number by about 29%.
  compared with 50
cites 1 paper herecited by 2 papers here
EFFECTS OF NITROGEN AND HERBICIDES ON ONION PRODUCTION IN A NEWLY RECLAIMED SOIL AND THEIR POTENTIAL HEALTH RISKS · 2016
- positive
  Higher nitrogen rates with hand weeding enhanced onion height, fresh and dry weight.
cited by 1 paper here
INFLUENCE OF SOME NITROGEN FERTILIZATION RATES AND APPLICATION METHODS ON GROWTH, YIELD AND YIELD COMPONENTS OF ONION · 2016
- positive
  120 kg N per feddan with starter fertilizer maximized onion dry matter in the second season.
cites 1 paper here
Influence of Integrated Nutrient Management on Growth Parameters, Yield and Severity of Disease in Onion (Allium cepa L.) · 2017
- positive
  Plant height was higher (62 cm) with 50% of recommended N from poultry manure plus 50% from inorganic fertilizers, Azospirillum and P. fluorescens than in the control.
  compared with Control
- positive
  Number of leaves was higher (11.35) with 50% of recommended N from poultry manure plus 50% from inorganic fertilizers, Azospirillum and P. fluorescens than in the control.
  compared with Control
Growth, Yield and Quality of Onion (Allium cepa L.) as Influenced by Organic Farming Practices · 2017
- positive
  Organic manure at 100 percent RDN gave the highest number of leaves, 10.5 per plant.
Growth and Yield of Onion Alum cepa L. as Influenced by Nitrogen and Phosphorus Fertilizers Levels · 2017
- positive
  216 kg N/ha increased onion length by 11.23 versus 72 kg N/ha.
  compared with 72 kg N/ha
- positive
  Combined highest nitrogen and phosphorus rates produced highest foliage fresh weight.
- positive
  216 kg N/ha increased onion number of leaves/plant by 12.27 versus 72 kg N/ha.
  compared with 72 kg N/ha
- positive
  216 kg N/ha increased onion foliage height by 4.76 versus 72 kg N/ha.
  compared with 72 kg N/ha
- positive
  216 kg N/ha increased onion foliage fresh weight by 15.9 versus 72 kg N/ha.
  compared with 72 kg N/ha
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 · 2017
- positive
  At 150 kg N ha -1 onion had maximum height, leaf number and girth thickness.
Influence of Nitrogen and Phosphorus Application on Bulb Yield and Yield Components of Onion (Allium Cepa L.) · 2018
- positive
  Nitrogen significantly affected most onion growth parameters and bulb characters, which peaked at 138 kg N ha -1.
cites 1 paper herecited by 1 paper here
THE CORRELATION BETWEEN GROWTH CHARACTERS AND YIELD OF SHALLOT (ALLIUM ASCALONICUM L.) DUE TO THE APPLICATION OF NITROGEN, PHOSPHATE AND POTASSIUM FERTILIZERS · 2018
- positive
  The highest shallot bulb dry weight per clump occurred with 150 kg N ha -1 and 160 kg P ha -1.
- positive
  The highest shallot bulb dry weight per clump occurred with 200 kg N ha -1 and 200 kg K ha -1.
Pengaruh Pemberian Pupuk Kotoran Ayam dan Urea terhadap Pertumbuhan dan Hasil Tanaman Bawang Daun pada Tanah Gambut Pedalaman · 2018
- positive
  Urea at 250 kg/ha gave better plant height and fresh weight of onion on inland peat soil.
Influence of Drip Irrigation and Nitrogen Fertigation on Growth Parameters of Onion (Allium cepa L.) · 2018
- positive
  150 kg/ha nitrogen fertigation gave the maximum leaf length relative to other nitrogen levels.
  compared with other levels of nitrogen fertigation
- positive
  150 kg/ha nitrogen fertigation gave the maximum plant height relative to other nitrogen levels.
  compared with other levels of nitrogen fertigation
- no effect
  Combined drip irrigation and nitrogen fertigation did not significantly differ for onion plant height.
cited by 1 paper here
EFFECT OF NITROGEN AND SOME WEED CONTROL METHODS ON YIELD AND QUALITY OF ONION IN A NEWLY RECLAIMED SOIL · 2018
- positive
  Highest nitrogen plus hand weeding increased large bulb share, doubles and fresh weight.
cites 3 papers here
Effect of different levels of NPK on seed yield of onion cv. Akola Safed · 2018
- positive
  The higher potassium combination maximized primary and secondary umbel diameter.
THE ROLE OF BROAD BEAN AND ONOION INTERCROPPING ON PRODUCTIVITY OF BOTH CROPS AND NITROGEN BUDGET IN SOIL · 2018
- positive
  Onion bulb dry weight rose from 17.8 to 22.8 g plant-1 under the second nitrogen level.
- positive
  Onion bulb fresh weight rose from 27.3 to 37.2 under the second nitrogen level.
Influence of NPK fertilizer and spacing on growth parameters of onion (Allium cepa L. var. BARI piaz-1) · 2019
- positive
  Plant height was highest at 20 cm × 10 cm with the stated NPK rates.
Optimal Rate of Nitrogen and Intra-Row Spacing for Economical Production of Onion under Irrigated Farming System in Eastern Amhara Region, Ethiopia · 2019
- positive
  123 kg ha-1 nitrogen increased onion leaf number by 67.3%.
  compared with respective control plants
Effect of Irrigation Methods and Nitrogen Application Rates on Yield and Yield Components of Onion (Allium Cepa L.) Grown under Russian Environmental Conditions · 2019
- positive
  SDI + 90 kg N/ha gave the highest plant height, leaf number, and neck diameter.
  compared with RF treatment with zero (0.0) rate of Nitrogen
- positive
  RF without nitrogen gave the lowest plant height, leaf number, and neck diameter.
  compared with SDI + 90 kg N/ha treatmentAbout lacking this nutrient, so it counts the other way round
Influence of Nitrogen and Phosphorus fertilizer Rates on Seed Yield, Yield Components and Quality of Onion (Allium cepa L.) at Kulumsa in Arsi Zone, South East Ethiopia · 2019
- positive
  N at 100 kg N ha-1 gave the highest onion seed germination percentage as a main factor.
cites 1 paper here
Effect of Plant Spacing and Np Fertilizer Levels on Growth, Seed Yield and Quality of Onion (Allium cepa L.) at Shewa Robit, Northern Ethiopia · 2020
- positive
  The interaction of 10×30 cm spacing with 143.6 P2O5 and 142.5 N kg/ha gave the highest germination percentage.
- positive
  The interaction of 115 P2O5 and 114 N kg/ha with 20×30×50 cm spacing gave the highest seed vigor index I and II.
Effect of Boron and Nitrogen on Growth and Yield of Onion (Allium cepa L.) Plant Using N-15 Technique · 2021
- positive
  Boron at 2.4 ppm with nitrogen at 80 kg N/fed.-1 significantly increased onion fresh and dry weight.
Effects of Different Nitrogen and Sulfur Fertilizer Rates on Growth, Yield, Quality and Nutrient Uptake of Onion (Allium cepa L.) at Shewa Robit, North Shewa, Ethiopia · 2021
- positive
  Nitrogen and sulfur interaction significantly increased onion growth traits.
- positive
  Nitrogen and sulfur interaction significantly increased leaf area index, neck diameter and shoot dry weight.
Response of Shallots of Batu Ijo Variety on Doses of N And K Fertilizers · 2021
- positive
  Urea 300 kg/ha without KCl gave the best leaf number.
- positive
  Urea 300 kg/ha and KCl 150 kg/ha gave the best fresh plant weight.
- positive
  Urea 300 kg/ha with KCl 50 kg/ha gave the best plant height.
Zeolite Oil Palm Compost-Based Organomineral Fertilizer for Shallot Agronomic Performances and N Substitution · 2022
- positive
  The 0.5 g urea plus 4.60 g OMF treatment yielded the highest plant height of 30.60 cm.
- positive
  The 0.5 g urea plus 4.60 g OMF treatment yielded the highest number of leaves of 30.90.
Impacts of Varying Nitrogen Levels on Leaf length of Onion Varieties under Poplar Based Agroforestry System · 2022
- positive
  At 120 kg N/h, Nasik Red had superior leaf length.
Nano chitosan-N fertilizer affecting the growth and productivity of onion plants under sandy soil conditions · 2023
- positive
  Increasing chitosan with 15% nano nitrogen generally increased onion growth.
- positive
  Recommended chemical nitrogen produced greater growth than chitosan and chitosan nitrogen treatments.
  compared with all treatments of chitosan or chitosan with nitrogen
Effects of Different Irrigation Levels and Fertilizer Rates on Yield, Yield Components and Water Productivity of Onion at Adami Tulu Agricultural Research Center · 2023
- positive
  Onion plant height was highest (53.07 cm) under full irrigation with full N fertilization compared with deficit conditions.
  compared with deficit conditions
- positive
  Onion bulb height was highest (6.13 cm) under full irrigation with full N fertilization compared with deficit conditions.
  compared with deficit conditions
Effect of Nitrogen (N) and Potassium (K) on Growth and Yield of Onion · 2023
- positive
  Nitrogen and potassium application significantly influenced plant height, leaf number and leaf length of onion, compared with the control.
  compared with Control (no nitrogen+no potassium)
cites 1 paper here
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 · 2023
- positive
  Half water hyacinth compost plus three-quarter NPK S dose increased bulb number, fresh weight and dry weight of shallots compared with control
  compared with control
Response of Onion (Allium cepa L.) to Foliar Application of Nano Urea and Urea · 2023
- positive
  T2 produced maximum equatorial diameter, 5.51 cm.
  compared with other treatments
- positive
  T2 produced maximum polar diameter, 5.17.
  compared with other treatments
- positive
  T2 produced maximum leaf number, 9.13.
  compared with other treatments
- positive
  T2 produced maximum plant height at 90 DAT, 57.82 cm.
  compared with other treatments
Vegetative Growth, Yield, and Quality of Onion as Influenced by Nitrogen Rates and Natural Stimulators · 2023
- positive
  Raising nitrogen from 144 to 288 kg N ha-1 increased onion growth traits.
  compared with 144
- positive
  The 216 kg N ha-1 and fulvic acid combination gave the highest dry matter in both seasons.
cites 1 paper here
Improving onion productivity and producer income through nitrogen management · 2023
- positive
  Intensive inorganic nitrogen use and application frequency increased onion growth.
Response of Onion Fresh Weight, NutrientsUptake, Nitrogen Use Efficiency, Yield,and Bulb Quality to Different NitrogenFertilization Levels and Plant Density · 2024
- positive
  The 288 kg N/ha with 4 rows/ridge interaction gave the highest fresh weight of leaves, bulbs and total fresh weight per plant.
Study of different Nitrogen levels on growth parameters of Kharif Onion (Allium cepa L.) under Malwa region · 2024
- positive
  Nitrogen application produced a generally positive response in growth parameters of kharif onion.
Effect of nitrogen fertilization levels and plant density on dry weight, yield components and bulb quality of onion plant · 2024
- positive
  288 kg N/ha increased total dry weight per plant by 6.86 and 5.74 g per plant across the two seasons relative to control.
  compared with control
- positive
  192 kg N/ha increased total dry weight per plant by 4.84 and 4.80 g per plant across the two seasons relative to control.
  compared with control
- positive
  288 kg N/ha increased onion dry weight per plant versus zero nitrogen.
  compared with control (zero N)
- positive
  244 kg N/ha increased total dry weight per plant by 4.76 and 3.87 g per plant across the two seasons relative to control.
  compared with control
Improving growth and productivity of shallot (Allium ascalonicum L.) applied using organic and inorganic fertilizer · 2024
- positive
  ZA at 150 kg/ha affected height, leaf number, production and chlorophyll index.
Response of organic sources of nitrogen on growth and yield of kharif onion (Allium cepa L.) · 2024
- positive
  Vermicompost at the full recommended N dose gave significantly higher plant height, leaf count and neck thickness.
- positive
  Vermicompost at the full recommended N dose gave significantly higher dry matter and days to maturity.
- negative
  Full recommended N through FYM reduced growth attributes.
Pemberian Pupuk Nano NPK Organik Terhadap Hasil Bawang Merah · 2025
- positive
  Nano NPK fertilizer at up to 220, 160 and 120 kg/ha of N, P and K can increase shallot growth variables.
Shallot Growth on Organic Nano NPK Fertilizer Application · 2025
- positive
  Organic nano NPK fertilizer at the stated dose can increase shallot growth.
Impact of Different Dosages of Urea on Nitrogen Distribution, Soil Dynamics, and Seed Yield in Onion Crop · 2025
- positive
  At 60 days, leaf nitrogen was highest at 150 kg N/ha in 2021–22.
- positive
  At 60 days, leaf nitrogen was highest at 150 kg N/ha in 2020–21.
Effete of Nitrogen Forms and Zinc Levels on Yield, Quality of Onion (Allium cepa L.) and Soil Fertility · 2025
- positive
  Combined urea and 1.5% ZnSO4 application can significantly enhance onion fresh weight (14176.17 and 14200.67 kg/fed) in both seasons
Optimizing Nitrogen and Phosphorus Fertilization for Improved Onion (Allium cepa L.) Growth and Yield in Bangladesh · 2025
- positive
  At 90 kg N/ha and 80 kg P/ha, onion leaf number reached 7.22.
  compared with control
- positive
  At 90 kg N/ha and 80 kg P/ha, onion plant height reached the highest value of 39.14 cm.
  compared with control
Effect of Bio and Mineral Nitrogen Fertilization on Growth and Yield of Three Onion Cultivars under Aswan Conditions. · 2025
- positive
  Giza Red showed superior plant height, leaf number and neck thickness when combined with full nitrogen and effective biofertilizer strains.
Effect of Graded Nitrogen Fertilization Under Different Microsprinkling Irrigation Levels on Growth, Water Status, Bulb Yield, Water, and Nitrogen use Efficiency of Winter Onion · 2026
- positive
  More irrigation and nitrogen significantly increased onion plant growth.
cites 1 paper here

Papers reporting a negative result or no effect 10

The phenology of onion bulb development at different sites and its relevance to incomplete bulbing (‘thick-necking’) · 1987
- negative
  Increased nitrogen slightly delayed bulb development.
cites 1 paper herecited by 1 paper here
Effects of split application of nitrogen on yield and nitrogen recovery of spring-sown onions and on residual nitrogen · 1998
- no effect
  Onion growth until the 3–4 leaf stage did not appear to be influenced by the N rate before sowing.
cited by 1 paper here
Season, and Nitrogen Source and Rate Affect Development and Yield of Shallot · 2002
- no effect
  Nitrogen source did not have significant effects on shallot plant height or leaf number.
cites 1 paper here
Nitrogen Use Efficiency and Onion Yield Increased with a Polymer-coated Nitrogen Source · 2002
- no effect
  Nitrogen source and rate had only minor effects on leaf area and storage potential.
cites 2 papers here
THE INFLUENCE OF N SOURCES AND FERTILIZATION DOSES ON DRY ONION (ALLIUM CEPA L.) YIELD AND BULBS SHELF LIFE · 2009
- negative
  Higher N dose decreased bulb dry matter.
Effect of Spacing and Nitrogen Fertilizer on the Yield and Yield Component of Shallot (Allium ascalonium L.) · 2015
- no effect
  The nitrogen by spacing interaction did not significantly affect stem diameter.
Evaluating the Effect of Onion (Allium cepa L.) Sowing Methods on Growth Characteristics of Purple Nutsedge (Cyperus rotundus L.) under Different Levels of Nitrogen Fertilizer · 2017
EFFECTS OF INTERCROPPING SYSTEM AND NITROGEN FERTILIZATION ON LAND EQUIVALENT RATIO, YIELD AND MINERAL CONTENT OF BROCCOLI · 2020
- no effect
  Plant weight of intercropped onion at 240 kg ha–1 nitrogen was not significantly decreased compared with monocropping.
  compared with monocroppingNo difference from an alternative treatment
Applied Nitrogen Fertilization and Irrigation on Improving Shallot (Allium ascolanicum L.) Growth and Yield on Dry Land in Mesuji, Lampung Province, Indonesia · 2023
- no effect
  Nitrogen fertilizer did not significantly affect leaf number or canopy cover.
cites 1 paper here
Incidência de tripes (Thrips tabaci) em populações superadensadas de cebola submetidas a doses de nitrogênio e seu efeito na biomassa dos bulbos · 2024
- no effect
  Nitrogen above 150 kg N ha-1 did not increase onion bulb biomass.

A paper is on the positive side when any of its claims here is positive. Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.

nitrogen · Growth · Allium cepa (onion)

Papers whose results differ, checked claim by claim 1

How these papers cite each other

Papers reporting a positive result 71

Papers reporting a negative result or no effect 10

nitrogen on Allium cepa (onion) against other targets

nitrogen · growth on other organisms