Increasing biochar and N/P fertilizer rates changed carrot growth and yield components.

nitrogen · yield · Daucus carota (carrot)Results differ

23 papers in the same direction as this claim · 8 in the opposite direction

1. no effect
   Nitrogen treatments did not affect Canada No. 1 and total carrot yield.

   Carrot Yield Response to Nitrogen Rate · 1997

   Opposite directionCited by this paper

2. no effect
   Yields of cabbage, carrots and onions were generally unaffected by N rate, except in cabbage in 2000.

   Assessment of Chlorophyll and Nitrate Meters as Field Tissue Nitrogen Tests for Cabbage, Onions, and Carrots · 2004

   Opposite direction

3. negative
   Above 91% of the recommendation, third-year yield declined because stand decreased at higher N rates.

   Carrot Yield, Quality, and Storability in Relation to Preplant and Residual Nitrogen on Mineral and Organic Soils · 2006 · compared with 91% of the recommended application rate

   Opposite direction

4. no effect
   Nitrogen application did not affect yield.

   Nitrogen and Fungicide Applications for the Management of Fungal Blights of Carrot · 2014

   Opposite direction

5. no effect
   carrot shoot dry matter yield and N concentration were not significantly affected by N treatment.

   Vegetable Crops Prefer Different Ratios of Ammonium-N and Nitrate-N in the Growth Media · 2021

   Opposite direction

6. negative
   Applied nitrogen tended to diminish carrot yield.

   The nutrition of the carrot. II. Grown in a fen soil · 1945

   Opposite direction

7. no effect
   Applied nitrogen had no effect on carrot yield on muck soils.

   (219) Nitrogen Relationships to Yield and Quality of Carrots Grown on Mineral and Organic Soil in Ontario · 2005

   Opposite direction

8. no effect
   Excess nitrogen did not increase carrot yield.

   Environmental and Management Factors Affecting Carrot Cracking · 2004 · compared with growers' N regime

   Opposite direction

23 papers more in this group

fertilization · yield · Daucus carota (carrot)Results differ

107 papers in the same direction as this claim · 11 in the opposite direction · 2 reporting no difference from an alternative

1. positive
   T4 gave the maximum carrot gross yield of 29.27 t ha-1.

   Influence of Commercially Available Organic vs Inorganic Fertilizers on Growth Yield and Quality of Carrot · 2012

   Same directionCited by this paper

2. no effect
   Iodine and selenium fertilization had no negative effect on carrot yield.

   Biofortification of Carrot (Daucus carota L.) with Iodine and Selenium in a Field Experiment · 2016

   Opposite direction

3. negative
   Vegetable yields under compost treatments were lower than under mineral fertilizers during the first two years.

   Enhanced Food Quality: Effects of Composts on the Quality of Plant Foods · 1993 · compared with mineral fertilizers

   Opposite direction

4. no effect
   Carrot yields were similar with and without nitrogen fertilizer, and band placement and rate did not affect carrot growth or nitrogen uptake.

   Effects of band placement and nitrogen rate on dry matter accumulation, yield and nitrogen uptake of cabbage, carrot and onion · 1999 · compared with without N fertilizers

   Opposite direction

5. no effect
   Neither lime nor phosphorus residues affected carrot yield.

   Effects of residues of lime and phosphorus fertilizer on cadmium uptake and yield of potatoes and carrots · 1997

   Opposite direction

6. no effect
   In Experiment I nitrogen fertilisation had no effect on carrot yield.

   Effect of various nitrogen fertilisation and foliar nutrition regimes on carrot (Daucus carotaL.) yield · 2008

   Opposite direction

7. no effect
   Iodine and selenium fertilization had no significant effect on average carrot root weight and leaf yield.

   The quality of carrot (Daucus carotaL.) cultivated in the field depending on iodine and selenium fertilization · 2016

   Opposite direction

8. no effect
   Carrot yield was unaffected by N fertilization rate.

   Nitrogen budget for fertilized carrot cropping systems in a Quebec organic soil · 2014

   Opposite direction

112 papers more in this group

biochar · yield · Daucus carota (carrot)Positive and negative results

3 papers in the same direction as this claim · 1 reporting no difference from an alternative

1. no effect
   T4 yield was at par with T8 yield.

   Effect of Vermicompost and Biochar on Growth and Yield of Carrot in Red Lateritic Soils of Purulia District of West Bengal · 2020 · compared with 75% Vermicompost + 25% NPK

   No difference from an alternative

2. positive
   Combined amendments at suboptimal rates increased soil nutrient concentrations, growth traits and carrot yield relative to individual amendments.

   Effect of tillage, biochar, poultry manure and NPK 15-15-15 fertilizer, and their mixture on soil properties, growth and carrot (Daucus carota L.) yield under tropical conditions · 2021 · compared with NPK fertilizer or biochar or poultry manure alone

   Same direction

3. positive
   Corn cob biochar gave the highest total yield at 23.1 t ha⁻¹.

   Influence of biochar derived from agricultural waste on soil properties and productivity of carrots (Daucus carota) · 2025 · compared with control

   Same direction

4. positive
   Biochar application enhanced vegetative growth and yield relative to unamended and fertilizer-treated plots.

   Response of Carrot and Lettuce Plants under Meloidogyne incognita Stress to Biochar Amended Soil · 2025 · compared with unamended and fertilizer-treated plots

   Same direction