nitrogen · Yield · Fragaria ×ananassa (strawberry)

Results differ60 papers: 48 positive, 12 negative or no effect · 9 pairs of papers confirmed to differ

110 claims from these papers; 16 citations between them.

Papers whose results differ, checked claim by claim 9

9 pairs 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.

INFLUENCE OF NITROGEN, POTASSIUM, AND MAGNESIUM FERTILIZATION ON DAY-NEUTRAL STRAWBERRIES IN QUEBEC (1994)
no changeN fertilization had no significant effect on strawberry yield and fruit size.
EFFECTS OF N, P, K, B AND LIME ON STRAWBERRY YIELDS (1984)
increaseApplied N increased strawberry yields.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
Fruits Malformation, Size and Yield in Relation to Nitrogen Nutrition and Nursery Plants in Large Fruited Strawberry (Fragaria^|^times;ananassa Duch. cv. Ai-Berry) (1991)
decreaseNitrogen application reduced total yield in the reported fruit response.
Influence of Rate, Timing, and Method of Nitrogen Fertilizer Application on Uptake and Use of Fertilizer Nitrogen, Growth, and Yield of June-bearing Strawberry (2004)
no changeFertilizer nitrogen treatments had no reported impact on plant dry weight, plant nitrogen, and yield.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
The Fertilization of Day-neutral Strawberries in Quebec (1995)
no changeN treatments (50 and 100 kg/ha) had no significant influence on strawberry yield and fruit size in either year.
Assessing the impact of varied nitrogen dosages on the vegetative and reproductive parameters of ‘Sweet Sensation’ and ‘Rubygem’ strawberry in Morang, Nepal (2023)
increaseNitrogen improved flower and fruit number and fruit yield in both cultivars.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
Effect of N-fertigation on fruit yield, leaf N and sugar content in fruits of two strawberry cultivars (1998)
increaseWeekly N fertilization increased fruit yield in both years for Bounty on poor sandy loam.
Influence of Rate, Timing, and Method of Nitrogen Fertilizer Application on Uptake and Use of Fertilizer Nitrogen, Growth, and Yield of June-bearing Strawberry (2004)
no changeFertilizer nitrogen treatments had no reported impact on plant dry weight, plant nitrogen, and yield.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
INFLUENCE OF NITROGEN, POTASSIUM, AND MAGNESIUM FERTILIZATION ON DAY-NEUTRAL STRAWBERRIES IN QUEBEC (1994)
no changeN fertilization had no significant effect on strawberry yield and fruit size.
Assessing the impact of varied nitrogen dosages on the vegetative and reproductive parameters of ‘Sweet Sensation’ and ‘Rubygem’ strawberry in Morang, Nepal (2023)
increaseNitrogen improved flower and fruit number and fruit yield in both cultivars.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
Fruits Malformation, Size and Yield in Relation to Nitrogen Nutrition and Nursery Plants in Large Fruited Strawberry (Fragaria^|^times;ananassa Duch. cv. Ai-Berry) (1991)
decreaseNitrogen application reduced total yield in the reported fruit response.
EFFECTS OF N, P, K, B AND LIME ON STRAWBERRY YIELDS (1984)
increaseApplied N increased strawberry yields.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →

Show 3 more pairs

EFFECTS OF N, P, K, B AND LIME ON STRAWBERRY YIELDS (1984)
increaseApplied N increased strawberry yields.
The Fertilization of Day-neutral Strawberries in Quebec (1995)
no changeN treatments (50 and 100 kg/ha) had no significant influence on strawberry yield and fruit size in either year.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
EFFECTS OF N, P, K, B AND LIME ON STRAWBERRY YIELDS (1984)
increaseApplied N increased strawberry yields.
Influence of Rate, Timing, and Method of Nitrogen Fertilizer Application on Uptake and Use of Fertilizer Nitrogen, Growth, and Yield of June-bearing Strawberry (2004)
no changeFertilizer nitrogen treatments had no reported impact on plant dry weight, plant nitrogen, and yield.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
Assessing the impact of varied nitrogen dosages on the vegetative and reproductive parameters of ‘Sweet Sensation’ and ‘Rubygem’ strawberry in Morang, Nepal (2023)
increaseNitrogen improved flower and fruit number and fruit yield in both cultivars.
Influence of Rate, Timing, and Method of Nitrogen Fertilizer Application on Uptake and Use of Fertilizer Nitrogen, Growth, and Yield of June-bearing Strawberry (2004)
no changeFertilizer nitrogen treatments had no reported impact on plant dry weight, plant nitrogen, and yield.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →

How these papers cite each other

16 citations between these papers: 12 on the same side, 4 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 48

Growth of the Strawberry Plant in Relation to Nitrogen and Phosphorus Nutrition · 1968
- positive
  Phosphorus and nitrogen deficiency reduced the rate of leaf production in strawberry.
  About lacking this nutrient, so it counts the other way round
- positive
  Phosphorus and nitrogen deficiency markedly reduced the rate of cell production in strawberry.
  About lacking this nutrient, so it counts the other way round
Effects of nitrogen supplied in various growth stages on the growth and yield of strawberry · 1969
- positive
  Continuous nitrogen supply gave the highest flower number and fruit yield.
- positive
  Withholding nitrogen during winter reduced flower number and fruit yield relative to controls.
  compared with control plantsAbout lacking this nutrient, so it counts the other way round
- positive
  Early nitrogen withholding increased fruit set percentage, average fruit weight and fruit soluble solids relative to the control.
  compared with the control
- positive
  Withholding nitrogen after late April or late February reduced flower number and fruit yield.
  compared with controlAbout lacking this nutrient, so it counts the other way round
- positive
  Subsequent nitrogen supply after early withholding stimulated top and root growth and runner production.
- negative
  Early nitrogen withholding reduced fruit yield because there were fewer flowers.
  compared with control
- negative
  Winter nitrogen withholding gave the highest yield among noncontrol treatments.
  compared with other treatments except the controlAbout lacking this nutrient, so it counts the other way round
Influence of Nitrogen, Deblossoming, and Growth Regulator Treatments on Growth, Flowering, and Runner Production of the ‘Gem’ Everbearing Strawberry1 · 1978
- positive
  Nitrogen increased runner production and vegetative growth.
The Response of Strawberry Yields to Soil Fumigation and Nitrogen Fertilization1 · 1978
- positive
  Preplant urea increased yield as effectively as split application.
  compared with an application split before planting and in August of the first growing year
cited by 1 paper here
Vegetative and Reproductive Growth Responses of Three Strawberry Cultivars to Nitrogen1 · 1981
- positive
  Olympus was the most responsive cultivar to applied N in leaf and flower production.
cited by 4 papers here
EFFECTS OF N, P, K, B AND LIME ON STRAWBERRY YIELDS · 1984
- positive
  Applied N increased strawberry yields.
- positive
  N increased second-crop yield more than first-crop yield.
  compared with first crop yields
Nitrogen rates in strawberry (Fragaria ananasa) nursery on growth and yield in the field · 1985
- positive
  Strawberry plants grown at 320 kg N/ha in the nursery gave higher total yields than those at the other rates.
  compared with other rates
- positive
  Strawberry plants grown at 320 kg N/ha in the nursery gave earlier yields than those at the other rates.
  compared with other rates
cites 2 papers herecited by 1 paper here
Effect of nitrogen and potassium fertilization on strawberries in an annual hill culture system: 1. Yield and fruit size · 1990
- positive
  The highest yields came from 36.5 kg N ha‐1 in spring and autumn split applications.
cites 2 papers herecited by 1 paper here
The Growth and Yield Responses ofFragaria ananassato Elevated CO2and N Supply · 1998
- positive
  Nitrogen deficiency decreased fruit size, fruit set and fruit number.
  About lacking this nutrient, so it counts the other way round
- positive
  Nitrogen deficiency reduced fruit yield by about 50%.
  About lacking this nutrient, so it counts the other way round
cited by 2 papers here
Effect of N-fertigation on fruit yield, leaf N and sugar content in fruits of two strawberry cultivars · 1998
- positive
  Weekly N fertilization increased fruit yield in both years for Korona on poor sandy loam.
- positive
  Weekly N fertilization increased fruit yield in both years for Bounty on poor sandy loam.
cited by 1 paper here
181 Strawberry Growth and Weed Control in Response to Using Corn Gluten Hydrolysate · 1999
- positive
  Nitrogen at 88 g N/plot increased average berry weight, leaf area and leaf dry weight.
- no effect
  Nitrogen rate had little or no effect on total strawberry yield.
RESPONSE OF TWO STRAWBERRY CULTIVARS TO BIO- AND CHEMICAL FERTILIZERS AND THEIR EFFECT ON PESTS INFESTATION · 2002
- positive
  Microbein + 75 % RNPF increased strawberry yield over the control in the second season.
  compared with control treatment
EFFECTS OF NITROGEN, ORGANIC MANURE AND BIOFERTILIZER APPLICATIONS ON STRAWBERRY PLANTS II. YIELD AND FRUIT QUALITY · 2003
- positive
  Increasing nitrogen increased yield potentials and average fruit weight.
STUDIES ON INFLUENCE OF BIOFERTILIZERS AND BIOREGULATORS ON FLOWERING, YIELD AND FRUIT QUALITY OF STRAWBERRY CV. SWEET CHARLIE · 2006
- positive
  The combined inoculation, nitrogen and GA3 treatment improved yield.
- positive
  The combined inoculation, nitrogen and GA3 treatment improved berry size, weight and volume.
- positive
  The combined inoculation, nitrogen and GA3 treatment improved fruit set.
cited by 1 paper here
Effect of Fym, Urea and Azotobacter on Growth, Yield and Quality of Strawberry Cv. Chandler · 2009
- positive
  Maximum yield of 372.89 g per plant was obtained with 100 % urea nitrogen plus Azotobacter.
- no effect
  Fruit size reached 37.62 x 28.01 mm with 25 % of nitrogen from FYM plus Azotobacter, at par with 100 % urea plus Azotobacter.
  compared with plants supplied with cent per cent nitrogen in the form of urea in combination with AzotobacterNo difference from an alternative treatment
- no effect
  Fruit weight reached 15.87 g with 25 % of nitrogen from FYM plus Azotobacter, at par with 100 % urea plus Azotobacter.
  compared with plants supplied with cent per cent nitrogen in the form of urea in combination with AzotobacterNo difference from an alternative treatment
- no effect
  Fruit yield of 358.43 g per plant with 25 % FYM plus 75 % urea nitrogen plus Azotobacter is at par with the maximum-yield treatment.
Late-season nitrogen applications in high-latitude strawberry nurseries improve transplant production pattern in warm regions · 2010
- positive
  Late-season foliar nitrogen applications increased early yields by 22% on average.
- no effect
  Late-season foliar nitrogen applications did not affect total season yields.
cites 1 paper here
Effect of subabul (Leucaena leucocephala), urea and biofertilizer application on growth, yield and quality of strawberry cv. Chandler. · 2010
- positive
  The treatment maximized fruit size at 38.4 x 28.9 mm.
- positive
  The treatment maximized yield at 385.2 q ha-1.
- positive
  The treatment maximized fruit weight at 16.9 g.
Effects of different fertilizing methods on enhancing ammonium for strawberry grown in greenhouse · 2010
- positive
  ammonium fertilizer applied with humus acid sodium increased greenhouse strawberry yield.
- positive
  Ammonium fertilizer with humus acid sodium gave better prophase yield, 620 kg per 667 m2.
  compared with Bag controlled-release fertilizer treatment
Effect of foliar application of nickel sulfate and urea on reproductive growth and quantitative and qualitative characteristics of strawberry fruit (Fragaria ananassa Duch. cv. Pajaro). · 2011
- positive
  Foliar 300 mg/L nickel sulfate without urea significantly increased strawberry yield versus control.
  compared with control
Nutritional studies on strawberry under polyhouse · 2011
- positive
  150 kg ha−1 N gave the maximum number of fruits per plant, 14.79.
- positive
  150 kg ha−1 N gave the maximum fruit weight, 8.11 g.
Effect of N, K and Mg on yield and fruit quality of strawberry (Fragaria×ananasa cv. Sun Rise) in hydroponic culture conditions · 2013
- positive
  A low level of urea significantly increased strawberry fruit weight.
Evaluation of nutrition on flower number and yield of strawberry in greenhouse · 2013
- positive
  Nitrogen at 240 mg/l was among the best treatments for increasing strawberry fruit yield.
Effect of nitrogen, phosphorus and potassium on growth and yield of strawberry (Fragaria x ananassa duch.) cv. sweet charlie · 2013
- positive
  The 100 kg N + 80 kg K/ha treatment gave maximum growth and yield improvement.
  compared with 100 kg N treatment
Impact of Integrated Nutrient Management on some Quantitative and Qualitative Characteristics of Strawberry cv. Chandler · 2013
- positive
  Full nitrogen as urea with Azotobacter gave the maximum total number of flowers, 29.41, in strawberry.
Evaluation of Early Nitrogen Rates on Strawberry Cultivars · 2013
- positive
  Early fruit number of 'Strawberry Festival' increased steadily with early N rates between 0 and 1.0 lb/acre per day.
- positive
  Early fruit number of 'Florida Radiance' increased sharply when the initial N rate rose from 0 to 0.5 lb/acre per day.
- positive
  A daily N rate of only 0.5 lb/acre increased early fruit weight of 'Florida Radiance'.
- no effect
  Early fruit number of 'Florida Radiance' remained constant at early N rates above 0.5 lb/acre per day.
- no effect
  Raising early N rates from 1.0 to 1.5 lb/acre per day failed to increase early fruit weight in 'Strawberry Festival'.
Contribuição do nitrogênio contido no adubo verde para o desenvolvimento do morangueiro · 2014
- positive
  Strawberry shoot dry matter production increased with N rates.
Response of nitrogen levels on growth and yield of strawberry (Fragaria x ananassa Duch.) · 2014
- positive
  Application of 100 kg N/ha produced the maximum number of leaves, plant spread, and flower buds per plant in strawberry.
- positive
  Application of 100 kg N/ha produced maximum strawberry yield per plant and per hectare.
- positive
  Application of 100 kg N/ha produced the maximum fruit length diameter ratio and fruit number per plant in strawberry.
Vegetative Growth, Yield and Leaf Mineral Composition in Strawberry (Fragaria × AnanassaDUCH. CV. Pajaro) as Influenced using Nickel Sulfate and Urea Sprays · 2014
- positive
  Nickel (300 mg L−1) plus urea (2 g L−1) significantly increased yield and runner numbers of strawberry.
Response of Strawberry to Salicylic Acid and Yeast Extract Applications under Different Nitrogen and Potassium Combinations · 2014
- positive
  The same N, K and salicylic acid treatment gave the highest average fruit length, diameter and weight.
- positive
  The highest rate of N and K fertilizers (200 kg N + 300 kg K2O) with salicylic acid at 1 g/L gave the highest yield and its components.
Influence of nitrogen nutrition on yield and growth of an everbearing strawberry cultivar (cv. Evie II) · 2015
- positive
  Nitrogen increased strawberry fruit number in the second year.
- positive
  Nitrogen increased strawberry fruit yield in the second year.
- no effect
  Nitrogen did not affect strawberry fruit yield in the first year.
- no effect
  Nitrogen did not affect strawberry fruit number in the first year.
cites 3 papers herecited by 1 paper here
Programmed flowering of the F1 long-day strawberry cultivar ‘Elan’ with nitrogen and daylength manipulation · 2015
- positive
  Elevated nitrogen in late spring enhanced field yield.
cited by 1 paper here
Effects of Crotalaria Incorporation into Soil as a Green Manure on Growth of Strawberry and Inorganic Soil Nitrogen Level · 2016
- positive
  Growth and yield of strawberry were highest with crotalaria plus 50% or 100% urea, followed by crotalaria alone.
  compared with crotalaria treatment
Optimization of Plant Growth and Yield Through Innovation of The Materials and Medium Verticulture · 2016
- positive
  The specified urea, SP36 and KCl rates increased strawberry yield per plant.
Changes in the Concentration of Leaf Nitrogen over the Season Affect the Diagnosis of Deficiency or Sufficiency in Strawberries in the Subtropics · 2018
- positive
  Nitrogen raised yield the next year, especially for early planting.
- negative
  Nitrogen reduced yield slightly in 2014.
cites 1 paper here
Growth of ‘Seascape’ strawberry (Fragaria X ananassa Duch.) is altered by photoperiod and nitrogen conditioning · 2020
- positive
  Elevated nitrogen slightly increased yield through 11 September.
cites 1 paper here
Growth, yield and quality of strawberry as affected by fertilizer N rate and biofertilizers inoculation under greenhouse conditions · 2020
- positive
  The 100% nitrogen rate gave maximum strawberry yield characters.
- positive
  Fruit yield reached 288.15 and 318.62 g/plant under 100% RDN in the two study years.
cites 1 paper here
Response of Strawberry (fragaria Ananassa)to The Application of Microbial Inoculants And Organic Fertilizers · 2020
- positive
  Urea and Azotobacter significantly increased the number of strawberry fruits compared with untreated plants.
  compared with untreated plants
- positive
  Urea and Azotobacter significantly increased strawberry fruit weight compared with untreated plants.
  compared with untreated plants
- positive
  Urea and Azotobacter significantly increased strawberry fruit length compared with untreated plants.
  compared with untreated plants
Characterizing Early-Season Nitrogen Fertilization Rate Effects on Growth, Yield, and Quality of Strawberry · 2021
- positive
  Increasing early-season nitrogen increased total season yield by up to 56% to 58% in the two cultivars.
cited by 1 paper here
Assessing the impact of varied nitrogen dosages on the vegetative and reproductive parameters of ‘Sweet Sensation’ and ‘Rubygem’ strawberry in Morang, Nepal · 2023
- positive
  Nitrogen improved flower and fruit number and fruit yield in both cultivars.
cites 3 papers here
Influence of beneficial soil microorganisms and mineral fertilizers enriched with them on the flowering, fruiting, and physical and chemical parameters of the fruit of three-year-old strawberry plants in field cultivation · 2023
- positive
  Reduced fertilizer doses with beneficial soil microorganisms benefited strawberry fruit yield compared with standard doses.
  compared with fertilizers applied in standard doses (100%)
Influence of doses of nitrogen fertilizers and plant growth regulators on generative and vegetative productivity of strawberry (Fragaria×ananassa Duch.) in a repository · 2023
- positive
  N 80 kg /ha increased generative productivity more in Nashe Podmoskov’e than in Polka and Tsaritsa.
  compared with cv. Polka and cv.Tsaritsa
- negative
  Growth regulators and increased nitrogen decreased generative productivity in Lyubava strawberry.
Effects of planting media and fertilizer composition on growth, yield and quality of strawberry (Fragaria × ananassa Duch.) · 2023
- positive
  Full fertilizer gave higher fruit length than control.
  compared with control
- positive
  Full fertilizer gave higher fruit yield than control.
  compared with control
- positive
  Full fertilizer gave higher total fruit weight per plant than control.
  compared with control
Effect of Foliar Application of Nano Urea, Boron and Zinc Sulphate on Growth Fruit Yield and Quality of Strawberry (Fragaria × ananassa Duch.) cv. Winter Dawn · 2024
- positive
  T9 and T8 foliar treatments gave the highest runner production/plant (8.56) in strawberry compared with control (T0).
  compared with control (T0)
- positive
  T9 and T8 foliar treatments gave the highest Fruit length (mm) (62.50 mm) in strawberry compared with control (T0).
  compared with control (T0)
- positive
  T9 and T8 foliar treatments gave the highest Fruit yield/ha. (54.79 q) in strawberry compared with control (T0).
  compared with control (T0)
Impact of Integrated Nutrient Management (INM) on flowering characteristics of strawberry (Fragaria × ananassa Duch.) · 2024
- positive
  Treatment T4 was reported most effective for strawberry Number of flowers per plant.
- positive
  Treatment T4 was reported most effective for strawberry Days to first fruit harvest.
- positive
  Treatment T4 was reported most effective for strawberry Percentage of fruit set per plant.
- positive
  Treatment T4 was reported most effective for strawberry Number of fruits per plant.
Effect of planting dates, chilling periods and N/P foliar spray on flowering traits of strawberry (Fragaria × ananassa) cv. Robygem in a hydroponic system. · 2024
- positive
  N/P 100/100 spraying increased flowers per plant to 18.222-16.083 across seasons.
Effect of Different Level of Nano Urea on Yield, Quality and Shelf life of Strawberry (Fragaria X ananassa) cv. Winter Dawn under Prayagraj Agro Climatic Condition, India · 2025
- positive
  Treatment T7 gave the best g yield per plant in strawberry
- positive
  Treatment T7 gave the best yield per hectare in strawberry
- positive
  Treatment T7 with 100% PK, 60% RDN and 0.8% nano urea gave the best number of fruits per plant in strawberry
Effect of Different Level of Nano Urea on Growth of Strawberry (Fragaria X ananassa) cv. Winter Dawn, under Prayagraj Agro Climatic Conditions · 2025
- positive
  T7 was best for flower number, with pooled value 22.19 per plant.
- positive
  T7 was best for leaf number, with pooled value 17.74 per plant.
Effect of Nano-urea on Performance of Strawberry (Fragaria × Ananassa Duch.) cv. Winter Dawn · 2025
- positive
  The 100% RDN soil application plus one 0.4% nano-urea spray gave the maximum fruit length of 62.27 mm.
- positive
  The 100% RDN soil application plus one 0.4% nano-urea spray gave the maximum yield per hectare of 19.39 t.
- positive
  The 100% RDN soil application plus one 0.4% nano-urea spray gave the maximum yield per plot of 8.73 kg.
- positive
  The 100% RDN soil application plus one 0.4% nano-urea spray gave the maximum fruit diameter of 43.13 mm.

Papers reporting a negative result or no effect 12

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 · Yield · Fragaria ×ananassa (strawberry)

Papers whose results differ, checked claim by claim 9

How these papers cite each other

Papers reporting a positive result 48

Papers reporting a negative result or no effect 12

nitrogen on Fragaria x ananassa (strawberry) against other targets

nitrogen · yield on other organisms