nitrogen · Yield · Citrus sinensis (sweet orange)

Studies on the control of alternate bearing in citrus. VII · 1962

• positive
  Urea spray increased Washington Navel orange fruit set.
• positive
  Urea was more effective at flowering than during the young fruit period.

  compared with young fruit period

• positive
  Cross pollination combined with urea was more effective than single treatments.

  compared with each of single treatment

• no effect
  urea showed no effect on fruit set in trees with many flowers and few leaves.

N and K Fertilization Effects on Leaf Analysis, Tree Size, and Yield of Three Major Florida Orange Cultivars1 · 1975

• positive
  All three orange cultivars reached maximum nitrogen yield response at 202 kg/ha/yr.
• positive
  Higher nitrogen rates increased orange fruit production.

cited by 2 papers here

EFFECT OF IRRIGATION TREATMENTS AND TIME OF FOLIAR-APPLIED UREA ON YIELD OF NAVEL ORANGE (CITRUS SINENSIS L. OSBECK) · 1990

• positive
  Foliar urea significantly increased fruit number per tree compared with controls.

  compared with control trees

• positive
  Foliar urea significantly increased fruit weight compared with controls.

  compared with control trees

Effect of nitrogen, phosphorus and potassium fertiliser rates on fruit yield, leaf mineral concentration and growth of young orange trees in the Sunraysia district · 1991

• positive
  At 12 years of age, highest yields occurred at the lowest N rate, medium P and nil K.
• positive
  Eight-year-old Sweet Orange trees gave maximum yield at higher N and P rates and medium K.
• negative
  High N without P at year 12 strongly depressed yield, especially on bare soil.

NUTRITIONAL REQUIREMENTS OF CITRUS CONVERTED FROM FLOOD TO A PRESSURIZED IRRIGATION SYSTEM · 1992

• positive
  N increased fruit yield only when P was added.

Economic Analysis of Integrated Crop Management Practices of `Navel' Oranges · 1993

• positive
  High nitrogen gave the second highest returns.
• positive
  The 120% ETc, fungicide-nematicide, medium or high nitrogen, no miticide and no gibberellin combination yielded the highest return.

  compared with all treatment combinations

AMMONIA AND/OR ITS METABOLITES INFLUENCE FLOWERING, FRUIT SET, AND YIELD OF THE `WASHINGTON' NAVEL ORANGE · 1993

• positive
  Foliar application of low-biuret urea during early bloom increased ovary putrescine content and fruit set.
• positive
  Winter foliar application of low-biuret urea before or during flower initiation increased yield by about one packing carton (17 kg) per tree in three successive years without reducing fruit size.
• no effect
  Foliar application of low-biuret urea during or at the end of a minimal stress treatment did not increase vegetative shoot production in Washington navel orange.

cited by 2 papers here

Winter Application of Low-biuret Urea to the Foliage of `Washington' Navel Orange Increased Yield · 1994

• positive
  Mid-January foliar urea increased orange fruit number per tree relative to soil-only controls in each of three years, regardless of irrigation treatment.

  compared with control trees

• positive
  Mid-February foliar urea increased orange fruit number per tree relative to soil-only controls in each of three years, regardless of irrigation treatment.

  compared with control trees

• positive
  Mid-February foliar urea increased orange yield relative to soil-only controls in each of three years, regardless of irrigation treatment.

  compared with control trees

• positive
  Mid-January foliar urea increased orange yield relative to soil-only controls in each of three years, regardless of irrigation treatment.

  compared with control trees

cited by 4 papers here

Effect of Urea, Some Micronutrients, and Growth Regulator Foliar Sprays on the Yield, Fruit Quality, and Some Vegetative Characteristics of `Washington' Navel Orange Trees—Yield and Yield Components · 1995

• positive
  Two sprays improved fruit number, weight and yield over one spray.

  compared with spraying once at any of the two dates

• positive
  Urea or micronutrients increased fruit weight.

Properly Timed Foliar Nutrient Applications Provide an Efficient Means to Meet Nutrient Demand to Increase Flowering, Fruit Set, and Size of Citrus and Avocado · 1998

• positive
  A winter prebloom foliar urea application increased yield and fruit number per tree of Washington navel orange for three consecutive years.

Management of foliar fertilization · 1999

• positive
  February foliar urea applications increased navel orange net cumulative yield by 16.4 t/ha over 3 years.
• positive
  A single winter prebloom foliar urea application significantly increased navel orange yield per tree in each of three consecutive years.
• positive
  Full-bloom foliar urea (0.16 kg N per tree) increased navel orange net cumulative yield by 7 t/ha over 2 years.
• positive
  January foliar urea applications increased navel orange net cumulative yield by 20.6 t/ha over 3 years.

cited by 1 paper here

Timing Citrus and Avocado Foliar Nutrient Applications to Increase Fruit Set and Size · 1999

• positive
  Winter urea significantly increased orange yield.

cites 1 paper herecited by 1 paper here

Nitrogen, Rootstocks, and Growth of Young 'Rhode Red' Valencia Orange Trees · 2001

• positive
  The highest nitrogen rate increased year-three yields on C. volkameriana rootstocks.
• positive
  The highest nitrogen rate increased year-three yields on Swingle rootstocks.

EFFECT OF SLOW RELEASE NITROGEN FERTILIZERS ON LEAF MIN REAL CONTENT, YIELD AND FRUIT QUALITY OF WASHINGTON NAVEL ORANGE TREES · 2004

• positive
  UF at 500 gm N/tree gave the highest yield weight per tree.

  compared with other treatments

• positive
  UF at 500 gm N/tree increased fruit number relative to other treatments.

  compared with other treatments

Fruit yield and quality of sweet oranges affected by nitrogen, phosphorus and potassium fertilization in tropical soils · 2006

• positive
  Valencia yield reached a maximum at 193 kg·ha–1 nitrogen.
• positive
  Pêra yield reached a maximum at 189 kg·ha–1 nitrogen.

cites 1 paper herecited by 2 papers here

Optimum nitrogen rate for fertigated young navel orange trees in arizona · 2007

• positive
  Fruit yield was maximal at interpolated nitrogen rates of 105 to 153 g/tree per year in the fourth through sixth growing seasons.

EARLY WINTER SPRAY OF LOW BIURET UREA IMPROVES MARKETABLE YIELD AND FRUIT QUALITY OF SWEET ORANGES · 2008

• positive
  November LBU spray increased grade-I fruit yield by 75% versus control.

  compared with control

• positive
  November LBU spray increased total yield by 102% versus control.

  compared with control

cites 3 papers here

EFFECT OF FOLIAR APPLICATION WITH UREA ON FLOWERING, RUITING AND LEAF NITROGEN CONTENT OF VALENCIA ORANGE TREES. · 2009

• positive
  Winter foliar urea increased number of fruits/tree in Valencia orange trees.
• positive
  Winter foliar urea increased number of flowers/branch in Valencia orange trees.
• positive
  Winter foliar urea increased fruit set/branch in Valencia orange trees.
• positive
  Mid-January 1.5% urea spray gave higher yield than the control.

  compared with the control

• positive
  Mid-January 1.5% urea spray gave higher fruit weight than the control.

  compared with the control

cites 2 papers here

Effect of winter foliar application of urea on some quantitative and qualitative characters of flower and fruit set of orange cv Valencia · 2010

• positive
  Urea increased flower number.

  compared with 0

• positive
  Urea increased fruit set.

  compared with 0

• positive
  Spraying six weeks before full bloom produced greater fruit set.

  compared with urea spray 9 weeks before full bloom

EFFECT OF UREA, SOME MICRONUTRIENTS AND TWO GROWTH REGULATORS FOLIAR SPRAYS ON VEGETATIVE GROWTH, YIELD AND FRUIT QUALITY OF WASHINGTON NAVEL ORANGE TREES · 2011

• positive
  Urea with micronutrients significantly increased fruit number and yield per tree.

Influence of Reducing Herbicides Rates in Washington Navel Orange Trees · 2012

• positive
  Pendimethalin IL with urea produced the highest yield per tree among herbicide treatments.

  compared with other herbicides treatments

Seasonal Variation in Leaf Chlorophyll Content of Newhall Navel Orange Seedlings Applied with Different Levels of Nitrogen · 2012

• positive
  Applied nitrogen tended to reduce spring and summer shoot leaf abscission the following May.

Nitrogen‐fertilizer forms affect the nitrogen‐use efficiency in fertigated citrus groves · 2014

• positive
  Fruit yield reached a maximum at 240 kg N ha –1 with AN.

Nitrogen and Potassium Based Fertigation Response on Plant Growth, Yield and Quality of Sweet Orange (Citrus sinensis Linn. Osbeck) cv. Sathgudi · 2014

• positive
  75% recommended N and K by fertigation gave significantly greatest fruit yield, 61.69 kg/tree.
• positive
  75% recommended N and K by fertigation gave significantly most fruits per tree, 345.69.

Effect of Foliar Applications of Urea on Flowering, Fruit set, Yield and Fruit Quality of Washington Navel Orange Trees · 2016

• positive
  Twice applying 1% urea significantly improved fruit set.
• positive
  Twice applying 1% urea significantly improved total yield.

cites 2 papers here

IMPACT OF SOME NITROGEN FERTILIZATION TREATMENTS ON VALENCIA ORANGE TREES A. EFFECT ON FRUIT SET, YIELD AND FRUIT QUALITY · 2016

• positive
  Frequent fertigation at 1000 g N/tree/year gave the highest fruit set and retention.
• positive
  Fertigation at 1000 g N/tree/year twice or thrice weekly gave highest yield, fruit number and cropping efficiency.

EFFECT OF BIO-FERTILIZERS AS A PARTIAL SUBSTITUTE FOR NITROGEN MINERAL FERTILIZER ON VEGETATIVE GROWTH, LEAF MINERAL CONTENT, YIELD AND FRUIT QUALITY OF VALENCIA’ ORANGE TREES · 2016

• positive
  Combined N and bio-fertilizer treatment improved yield and number of fruit per tree of Valencia oranges.

  compared with 100% mineral nitrogen fertilization

Effect of Integrated Nutrient Management on Growth, Yield and Fruit Quality of Sweet Orange (Citrus sinensis L.) cv. Mosambi · 2017

• positive
  T3 gave the highest fruit yield, weight and size.
• positive
  T3 gave the highest tree height, shoot growth and fruit set.

cited by 1 paper here

Effects of Combination Between Nitrogen and Potassium Fertilization on Yield and Quality of Valencia Orange Fruits · 2019

• positive
  Maximum fruit yield was attained with 0.5 kg N/tree combined with 0.9 kg K/tree.

cites 1 paper here

Influence of combined use of organic, inorganic and biological sources of nutrients in sweet orange · 2019

• positive
  Treatment T7 gave maximum sweet orange fruit yield.
• positive
  Treatment T8 gave the highest benefit-cost ratio because it omitted organics and reduced cost.

IMPACT OF ORGANIC AND INORGANIC NITROGEN FERTILIZERS ON WASHINGTON NAVEL ORANGE TREES. I. VEGETATIVE GROWTH, YIELD AND SOIL PROPERTIES · 2019

• positive
  T3 and T4 produced highest yield.

Roll of Organic Manures and Different Doses of N, P, K on Growth, Establishment and Percentage of Survival of Sweet Orange (Citrus sinensis Osbeck) Grafted Plants · 2020

• positive
  Treatment T12 gave 9.22 branches per grafted sweet orange plant, the best value.

Impact of Foliar Application of Growth Regulators and Macro Nutrients on Fruit Yield and Quality of Sweet Orange cv. Sathgudi · 2020

• positive
  Urea plus 2,4-D before harvest raised sweet orange yield by 40% versus water control.

  compared with control

• positive
  Urea plus GA3 before harvest raised sweet orange yield by 39.76% versus water control.

  compared with control

Studies on effect of foliar application of urea, zinc sulphate and 2,4-D on growth and yield parameters of sweet orange Var. Nucellar (Citrus sinensis L. Osbeck) · 2020

• positive
  T7 was most effective for fruit diameter and fruit volume, followed by T6.

  compared with ZnSO4 -0.4% + 2,4-D – 20 ppm

• positive
  T7 gave the strongest plant height, fruit number, fruit weight, fruit diameter, and fruit volume results.

  compared with ZnSO4 -0.4% + 2,4-D – 20 ppm

Effect of nitrogen level application on yield and fruit quality of Navel orange variety in a sandy soil · 2022

• positive
  Fruit yield per tree was improved significantly by increasing N rate in Navel orange.

Effect Of Winter Spraying Of Urea On Valencia Orange Treesscript title already exists · 2022

• positive
  Higher urea concentrations and spraying frequency promoted yield.
• positive
  Higher urea concentrations and spraying frequency promoted fruit set.
• positive
  Spraying 3.0% urea was more effective for yield than 2.0%.

  compared with spraying it at 2.0%

effect of soil nitrogen fertilizer on fruit set, the yield and fruit quality of Valencia orang trees. · 2022

• positive
  Higher nitrogen doses increased yield per tree.
• positive
  Higher nitrogen doses increased fruit set in Valencia orange trees.
• positive
  Annual application of 1200 g N /tree in three batches gave the best yield.

Impact of Integrated Nutrient Management on Yield, Soil, and Plant Nutrient Status in Sweet Orange ( Citrus sinensis L.) cv. Phule Mosambi · 2024

• positive
  T11 produced significantly higher sweet orange yield in 2019 and 2020 and was at par with T10.

  compared with T10

cites 1 paper here

Standardisation of different levels and split application of nitrogen on growth and yield of sweet orange (Citrus sinensis (L.) OSBECK) CV. Phule Mosambi · 2024

• positive
  1000 g N per plant in three splits gave maximum fruit yield of 69.40 kg/plant and 19.29 t/ha.
• positive
  1000 g N per plant increased fruit diameter to 8.11 cm.
• positive
  1000 g N per plant increased fruit length to 8.19 cm.
• positive
  1000 g N per plant in three splits gave maximum number of fruits per plant of 305.
• positive
  Three nitrogen splits gave maximum yield of 58.68 kg/plant and 16.31 t/ha.
• positive
  1000 g N per plant increased number of fruits per plant to 278.
• positive
  1000 g N per plant in three splits gave maximum fruit weight of 265 g.
• positive
  1000 g N per plant increased fruit set at pea stage to 61.10%.
• positive
  Three nitrogen splits gave maximum number of fruits of 258.13.
• positive
  1000 g N per plant increased fruit yield to 64.40 kg/tree and 17.90 t/ha.
• positive
  1000 g N per plant increased fruit weight to 246.39 g.
• positive
  Three nitrogen splits gave maximum fruit set of 57.71%.