Carbamide (urea) additional fertilizing was effective only when wheat was sown after maize, with a productivity increase of 0.40 t/ha.

urea · yield · Triticum aestivum (wheat)Results agree

4 papers in the same direction as this claim

1. positive
   yield increase in winter wheat under the stated conditions.

   Influence of Mineral Fertilizers on Winter Wheat Yield · 2018 · compared with control one

   Same direction

2. positive
   Carbamide and fungicide at earing significantly increased wheat yield.

   Optimization of nitrogen top dressing of the winter wheat at growing on the bare fallow · 2020

   Same direction

3. positive
   Jinqiang No.1 yielded 169.45 kg/667m2 under the specified seeding and Carbamide schedule.

   Influence on Different Cultivating Measure to the Yield and Quality of Spring Wheat · 2006

   Same direction

4. positive
   Carbamide at 10 kg/ha increased productivity by 0.42 t/ha in 2018.

   The effect of nitrogen fertilizers and their tank mixtures with herbicides and fungicides on spring wheat productivity · 2021

   Same direction

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

1,736 papers in the same direction as this claim · 285 in the opposite direction · 39 reporting no difference from an alternative

1. negative
   The lowest N rates reduced grain number per square metre at any given photothermal quotient.

   The effects of radiation and nitrogen on number of grains in wheat · 1995

   Opposite direction

2. negative
   Severe drought with low nitrogen reduced grain yields.

   Nitrogen Nutrition Improves the Potential of Wheat (Triticum aestivum L.) to Alleviate the Effects of Drought Stress during Vegetative Growth Periods · 2016

   Opposite direction

3. negative
   Low nitrogen reduced grain yield to 4.3 t/ha.

   The Effects of Prolonged Drought and Nitrogen Fertilizer on Root and Shoot Growth and Water Uptake by Winter Wheat · 1989 · compared with both N and water

   Opposite direction

4. negative
   Terminal spikelet production was delayed by about 2 d at these N treatments in Aroona.

   Leaf Emergence, Tiller Growth, and Apical Development of Nitrogen‐Dificient Spring Wheat · 1993

   Opposite direction

5. no effect
   Nitrogen level, N timing and seeding rate had no significant effect on spring wheat grain yield across environments.

   Seeding Rate and Nitrogen Management Effects on Spring Wheat Yield and Yield Components · 2007

   Opposite direction

6. no effect
   ear weight changed with two nitrogen treatments.

   Effect of source‐sink relations and nitrogen nutrition on senescence and N remobilization in the flag leaf of wheat · 1991

   Opposite direction

7. negative
   In some environments, higher nitrogen rates lowered wheat yield.

   Graphic Analysis of Genotype, Environment, Nitrogen Fertilizer, and Their Interactions on Spring Wheat Yield · 2004

   Opposite direction

8. no effect
   Nitrogen timing did not significantly affect grain yield.

   Hard Red Spring Wheat Response to Row Spacing, Seeding Rate, and Nitrogen · 2008

   Opposite direction

2,052 papers more in this group

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

3,429 papers more in this group