The combination recorded maximum unfilled seeds per capitulum at 13.33.

Azospirillum · yield · Helianthus annuus (common sunflower)Results agree

5 papers in the same direction as this claim

1. positive
   Azospirillum inoculation increased sunflower growth, nutrient content and yield versus full NPK control.

   Effect of Bio- and Chemical Fertilization on Growth of Sunflower (Helianthus annuus L.) at South Valley Area · 2010 · compared with control (full dose of NPK chemical fertilization)

   Same directionCited by this paper

2. positive
   Sunflower treatment with 50% nitrogen plus Azospirillum recorded high seed yield (1685 kg/ha), at par with 100% nitrogen plus Azospirillum and Azatobacter.

   Effect of biofertilizer on sunflower, Helianthus annuus L. · 2009 · compared with T10 (100% nitrogen + Azospirillum + Azatobacterseed treatment)

   Same direction

3. positive
   Azospirillum inoculation increased yield, percentage of nitrogen in grains and number of grains in a row in sunflower.

   The role of Azospirillum lipoferum bacteria in sustainable production of sunflower (Helianthus annuus L.). · 2010

   Same direction

4. positive
   Azospirillum flocculated cells were superior in increasing the growth and yield of sunflower in a field trial at graded nitrogen levels.

   Long-Term Survivability of Azospirillum Flocculated Cell in Different Inoculant Carriers and its Field Level Evaluation at Graded N Levels · 2009

   Same direction

5. positive
   Combined Azospirillum AZP18 and Azotobacter MTCC446 inoculation favored higher sunflower growth and yield in pots.

   Multigeneric co-aggregation in Azospirillum brasilense AZP18 with other PGPR strains and its inoculation effect on the growth and yield of sunflower (Helianthus annuus ‘Sunbeam’) · 2011

   Same direction

Azotobacter · yield · Helianthus annuus (common sunflower)Results agree

10 papers in the same direction as this claim

1. positive
   Combined PSB, VAM and Azotobacter inoculation produced higher sunflower seed yield than the listed alternative inoculations in both years.

   Response of biofertilizers and homo-brassinolide on growth, yield and oil content of sunflower (Helianthus annuus L.) · 2014 · compared with Azotobacter

   Same direction

2. positive
   The highest sunflower grain yield, 4.556 ton/ha, was achieved with manure, Azotobacter and Pseudomonas together.

   Response of Sunflower Yield and Phytohormonal Changes to Azotobacter , Azospirillum , Pseudomonas and Animal Manure in a Chemical Free Agroecosystem · 2011

   Same direction

3. positive
   EM-X enhanced sunflower productivity relative to other biofertilization treatments.

   Integration of EM-X Biofertilization and Sowing Methods on Encouragement of Sunflower Productivity and Charcoal Rot Control under Reclaimed Soil Conditions · 2017 · compared with other examined biofertilization treatments

   Same direction

4. positive
   Application of 160 kg N ha -1 with seed priming with Azotobacter gave the highest grain yield.

   Effects of Seed Priming with Plant Growth Promoting Rhizobacteria (PGPR) on Grain Yield, Fertilizer Use Efficiency and Dry Matter Remobilization of Sunflower (Helianthus annus L.) with Various Levels of Nitrogen Fertilizer · 2012

   Same direction

5. positive
   Combined Azospirillum AZP18 and Azotobacter MTCC446 inoculation favored higher sunflower growth and yield in pots.

   Multigeneric co-aggregation in Azospirillum brasilense AZP18 with other PGPR strains and its inoculation effect on the growth and yield of sunflower (Helianthus annuus ‘Sunbeam’) · 2011

   Same direction

6. positive
   Full irrigation with Azotobacter and mycorrhiza gave the highest sunflower grain filling rate, at 1.95 g per day.

   Effect of Irrigation Withholding in Reproductive Stages and Biofertilizers on Quantity and Quality of Yield and Grain Filling Duration of Sunflower (Helianthus annus L.) · 2017

   Same direction

7. positive
   Combined liquid bacterial inoculation gave the highest seed yield.

   Synergistic effect of Azotobacter and phosphate solublizing bacteria (PSB) inoculation on yield of Rabi sunflower under dryland conditions · 2018

   Same direction

8. positive
   Fertilization with 125% RDF + Azotobacter + S gave the highest number of seeds per capitulum in sunflower

   Influence of fertility levels and cytokinin on yield attributes and yields of sunflower (Helianthus annuus L.) · 2020 · compared with nutrient management treatments

   Same direction

2 papers more in this group

nitrogen · yield · Helianthus annuus (common sunflower)Positive and negative results

181 papers in the same direction as this claim · 10 in the opposite direction · 4 reporting no difference from an alternative

1. negative
   The relative energy cost of one achene rose one to twenty-fourfold with greater density and lower nitrogen.

   Regulatory Mechanisms of Reproductive Effort in Plants 1. Plasticity in Reproductive Energy Allocation and Propagule Output of Helianthus annuus L. (Compositae) Cultivated at Varying Densities and Nitrogen Levels · 1986

   Opposite direction

2. no effect
   N did not significantly affect yield at sites with higher chlorophyll readings.

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

   Opposite direction

3. negative
   The 60 kg N ha−1 dose alone yielded significantly less.

   Effect of Varying Nitrogen and Micronutrient Fertilization on Yield Quantity and Quality of Sunflower (Helianthus annuus L.) Achenes · 2022

   Opposite direction

4. negative
   N rates of 180-210 kg ha−1 decreased sunflower seed yield by 2%-5%.

   Early sowing increases nitrogen use efficiency of sunflower in wet clay soils · 2023

   Opposite direction

5. negative
   Glufosinate ammonium and ametryn herbicides reflected in losses of sunflower dry weight biomass and crop yield.

   Control of volunteer soybean plants in sunflower crop1 · 2015

   Opposite direction

6. no effect
   Side-dressing with urea had no effect on sunflower yield.

   Potential for sunflower to use residual soil water in the dry season after maize in North-West Cambodia · 2014

   Opposite direction

7. no effect
   Nitrogen input had no significant effect on sunflower growth or seed yield.

   IRRIGATION AND N-FERTILIZATION EFFECTS ON THE GROWTH AND PRODUCTIVITY OF SUNFLOWER IN AN AQUIC SOIL IN CENTRAL GREECE · 2007

   Opposite direction

8. no effect
   Urea application had no effect on growth attributes and grain yield of sunflower.

   Effect of Seedbed Preparation and Nitrogen Fertilizer on the Performance of a Sunflower (Helianthus annuus L.) Hybrid under Rain-fed Conditions · 2013

   Opposite direction

187 papers more in this group