These heading nitrogen applications had little effect on grain yield.

nitrogen · yield · Triticum aestivum (wheat)Positive and negative results

323 papers in the same direction as this claim · 1,737 in the opposite direction

This claim is about lacking the nutrient, so it counts the other way round here.

1. no effect
   The heading applications had little effect on grain yield.

   Effects of Early Season Nitrogen Rates on Stem Nitrate Levels and Nitrogen Fertilizer Requirements During Grain Filling for Irrigated Durum Wheat · 1989

   Same directionCited by this paperAbout lacking this nutrient, so it counts the other way round

2. positive
   At the site with little water deficit, high nitrogen increased dry grain yield from 607 to 798 g/m2.

   'Haying-off', the negative grain yield response of dryland wheat to nitrogen fertiliser. I. Biomass, grain yield, and water use · 1998 · compared with low-N control crop

   Opposite direction

3. positive
   Applying 30 kg N ha −1 at SPAD 42 at maximum tillering increased wheat yield by 20%.

   Chlorophyll Meter– and Leaf Color Chart–Based Nitrogen Management for Rice and Wheat in Northwestern India · 2002

   Opposite direction

4. positive
   The highest wheat grain yield was achieved with 160 kg N per ha plus 30 Mg compost per ha.

   Effect of Organic and Inorganic Fertilizers on Grain Yield and Protein Banding Pattern of Wheat · 2010

   Opposite direction

5. positive
   Nitrogen raised wheat grain number per square meter from 16 700 to 20 600.

   Effects of nitrogen on crop development and grain growth of winter wheat in relation to assimilation and utilization of assimilates and nutrients. · 1978

   Opposite direction

6. positive
   LCC-based N management gave 19 to 31% higher net returns than fixed-time N application in rice-wheat cropping.

   Calibrating the Leaf Color Chart for Nitrogen Management in Different Genotypes of Rice and Wheat in a Systems Perspective · 2004 · compared with fixed‐time N application

   Opposite direction

7. positive
   Plant height, plant number per m2 and spikes per m2 were maximal at 200 kg N/ha.

   Bread wheat varieties as influenced by different nitrogen levels · 2005

   Opposite direction

8. positive
   In 1990, nitrogen application at growth stage 10 yielded more grain than application at stage 4 or 6.

   Nitrogen Fertilization Timing Effect on Wheat Production, Nitrogen Uptake Efficiency, and Residual Soil Nitrogen · 1993 · compared with application at GS 4 or 6

   Opposite direction

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