Application of 5 tonnes farmyard manure per ha significantly increased wheat yield (1 347 Lg/ha) compared with no farmyard manure.

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

3,114 papers in the same direction as this claim · 284 in the opposite direction · 39 reporting no difference from an alternative

1. no effect
   Current high nitrogen practices do not significantly raise crop yields relative to optimum fertilization.

   Reducing environmental risk by improving N management in intensive Chinese agricultural systems · 2009 · compared with knowledge-based optimum N fertilization

   Opposite direction

2. negative
   Wheat yield declined by 0.04 Mg ha −1 yr −1 with 75 and 100% N-P-K fertilizer.

   Yield and Soil Nutrient Changes in a Long‐Term Rice‐Wheat Rotation in India · 2002

   Opposite direction

3. negative
   The authors concluded that N fertiliser could not compensate for the yield reduction in canola and wheat due to late sowing.

   Effects of sowing time and nitrogen fertiliser on canola and wheat, and nitrogen fertiliser on Indian mustard. I. Dry matter production, grain yield, and yield components · 2001

   Opposite direction

4. negative
   Genetic gain in winter wheat yield without fertiliser N was 0.021 t ha −1 y −1, smaller than at 215–250 kg/ha N.

   Responses of grain yield, biomass and harvest index and their rates of genetic progress to nitrogen availability in ten winter wheat varieties · 2006 · compared with 215–250 kg/ha N

   Opposite direction

5. no effect
   The fertilizing substances did not significantly change plant yields.

   The influence of chlorothalonil on the activity of soil microorganisms and enzymes · 2018

   Opposite direction

6. no effect
   Compost did not significantly affect wheat grain yield, biomass or harvest index.

   Responses of Wheat Yield, Macro- and Micro-Nutrients, and Heavy Metals in Soil and Wheat following the Application of Manure Compost on the North China Plain · 2016

   Opposite direction

7. no effect
   Wheat yields were similar in fertilized fallow and unfertilized green-manure plots.

   Wheat Yields, Nitrogen Uptake, and Soil Moisture Following Winter Legume Cover Crop vs. Fallow · 1998 · compared with unfertilized plots following a green manure crop

   Opposite direction

8. no effect
   Incorporation timing of feedlot cattle manure had no impact on soil or crop performance.

   Effect of rate, frequency and incorporation of feedlot cattle manure on soil nitrogen availability, crop performance and nitrogen use efficiency in east-central Saskatchewan · 2004

   Opposite direction

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