The recommended fertilizer plus zinc sulfate treatment gave maximum oil yield of 0.91 t ha -1.

zinc sulfate · quality: oil · Helianthus annuus (common sunflower)Results agree

3 papers in the same direction as this claim

1. positive
   Zinc sulphate pelleting gave higher oil content (37.11 %) than control and other treatments.

   Influence of Seed Pelleting on Seed Quality of Sunflower hybrid seed production of KBSH-53(Helianthus annus L.) · 2014 · compared with control and other treatments

   Same direction

2. positive
   Priming with 0.2% ZnSO 4 produced the highest seed yield and oil content, followed by 1.0% Urea.

   Nutri-Seed Priming and Planting Geometry Effects on Growth and Oil Production of Sunflower Varieties under the Ecological Conditions of Tandojam, Sindh, Pakistan · 2020 · compared with seeds primed with 1.0% Urea

   Same direction

3. positive
   The RDF with Zn, Fe and B treatment (T6) recorded the highest oil content and oil yield.

   Macro and Micronutrient Driven Improvement in Growth, Yield and Quality of Kharif Sunflower (Helianthus annuus L.) · 2026

   Same direction

phosphorus · quality: oil · Helianthus annuus (common sunflower)Results differ

20 papers in the same direction as this claim · 1 in the opposite direction

1. no effect
   P application did not influence sunflower oil content.

   Sunflower Response to Nitrogen and Phosphorus in Wheat‐Fallow Cropping Systems · 1997

   Opposite direction

2. positive
   PSB increased oil yield by 24.7%.

   Performance of phosphate solubilizing bacteria for improving growth and yield of sunflower (Helianthus annuus L.) in the presence of phosphorus fertilizer · 2010 · compared with no application

   Same direction

3. positive
   Increasing phosphorus above 75% of the recommended rate raised biological, seed and oil yields in uninoculated sunflower.

   Effect Of Va-Mycorrhiza On Growth And Yield Of Sunflower (Helianthus Annuus L.) At Different Phosphorus Levels · 2010

   Same direction

4. positive
   P application up to 30 kg P2O5 ha-1 significantly increased sunflower oil content.

   Effect of Fertilizer Nitrogen and Phosphorus on the Grain Yield, Nutrient Uptake and Oil Quality of Sunflower · 1997

   Same direction

5. positive
   The N/P ratio of 1.40 with 126 kg N ha-1 and 90 kg P ha-1 gave higher seed yield, oil content and oil yield than other N/P ratios.

   Response of Sunflower to Different N/P Fertilizer Ratios and Levels of Nitrogen and Phosphorus · 2017 · compared with other N/P fertilizer ratios with different nitrogen and phosphorus levels

   Same direction

6. positive
   In non-inoculated sunflower, biological yield, seed yield and oil yield increased with P above 75% of the recommended rate.

   Response of Sunflower (Helianthus annuus L.) To Inoculation with Mycorrhiza Under Different Phosphorus Levels · 2012

   Same direction

7. positive
   Sunflower oil yield was highest at 100% chemical fertilizer requirement combined with Nitroxin and Phosphate Barvare2 inoculation.

   Effect of Biological and Chemical Fertilizers of Nitrogen and Phosphorus on Quantitative and Qualitative Yield of Sunflower · 2013

   Same direction

8. positive
   At NIP ratio 1.0 sunflower oil content was higher at 41.46%.

   EFFECT OF NITROGEN AND PHOSPHORUS LEVELS AND RATIOS ON YIELD AND QUALITY OF SUNFLOWER (HELIANTHUS ANNUUS L.) · 2004 · compared with other ratios and control

   Same direction

13 papers more in this group

fertilization · quality: oil · Helianthus annuus (common sunflower)Results differ

75 papers in the same direction as this claim · 13 in the opposite direction

1. positive
   Application of N, S and B fertilizers significantly increased yield attributes, yield and oil quality parameters of spring sunflower.

   Effect of nitrogen sources, sulphur and boron levels on productivity, nutrient uptake and quality of sunflower (Helianthus annuus) · 2008

   Same directionCited by this paper

2. no effect
   Phosphate fertilization had little effect on seed yield, oil concentration and lodging.

   Response of Sunflower to Nitrogen and Phosphorus in North Dakota · 2018

   Opposite direction

3. negative
   Nitrogen fertilizer reduced seed oil percentage.

   Sunflower Nutrient Uptake, Growth, and Yield as Affected by Nitrogen or Manure, and Plant Population¹ · 1982

   Opposite direction

4. no effect
   Nitrogen fertilization had no effect on sunflower grain oil concentration.

   Nitrogen Balance Approach to Sunflower Fertilization · 2003

   Opposite direction

5. negative
   N fertilization decreased oil concentration by 2% in experiments E1, E4, E9, E11, and E12.

   Does nitrogen fertilization rate, timing, and splitting affect sunflower yield and grain quality? · 2023

   Opposite direction

6. no effect
   Goat manure as organic fertilizer had no effect on sunflower oil content.

   GOAT MANURE FERTILIZATION AND IRRIGATION ON PRODUCTION COMPONENTS OF SUNFLOWER · 2019

   Opposite direction

7. negative
   Increasing the nitrogen fertilizer rate on a phosphorus background slightly decreased seed oil content.

   Sunflower hybrids productivity depending on the rates of mineral fertilizers in the south of Ukraine · 2023

   Opposite direction

8. negative
   Mineral fertilizer at N32P32K32 decreased seed oil content by 1.1–1.7% relative to no fertilizers.

   Вплив макро- і мікродобрив на біометричні, продуктивні та якісні показники гібридів соняшнику · 2021 · compared with no fertilizers

   Opposite direction

80 papers more in this group