Paper · 2025 · Journal of Plant Nutrition and Soil Science

Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield

Muhammad Nadeem Ashraf; Ashar Rauf; Waqar Ahmad; et al.

16
claims
80
verbatim quotes
4
citations
2
research areas
—
Not open access

Abstract

ABSTRACT Background Soil nitrogen (N) losses present significant environmental and economic challenges. Therefore, it is imperative to implement strategies aimed at mitigating N loss and improving nitrogen use efficiency (NUE). Aims We conducted incubation and pot experiments to evaluate the comparative effectiveness of coated urea against conventional urea applications in reducing N loss via ammonium (NH 4 + ) and nitrate (NO 3 − ) release, as well as ammonia (NH 3 ) volatilization and improving crop yield. Methods A pot experiment was conducted to explore the potential of coated urea to enhance the NUE and yield of wheat crops cultivated in two soils with distinct textures. Treatments included (1) no fertilizer control (CK), (2) conventional urea (ordinary urea [OU]), (3) neem‐coated urea (NCU), (4) moringa‐coated urea (MCU), (5) sulfur‐coated urea (SCU), and (6) biochar‐coated urea (BCU). Results The results from the incubation experiment indicated that all the coated fertilization strategies performed well, but BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively, followed by SCU, NCU, and MCU. In pot experiment, the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively. Overall, the trend of coated urea treatment in improving plant physiological and yield parameters was BCU > SCU > MCU > NCU > OU > CK. Moreover, NUE was significantly enhanced in all coated fertilizers compared to CK, with BCU showing the highest increase in NUE (75%) in clay loam soil and 62% in sandy loam soil relative to CK. The order of agronomic and recovery NUE trend is expressed as BCU > SCU > MCU > NCU > OU > CK in sandy loam and clay loam soil. Conclusions All the coated fertilizers performed well, enhanced the NUE, and reduced NH 3 volatilization, but BCU was suggested as the best option among all coated fertilizers to minimize the N losses and balance crop productivity with environmental protection in diverse soil types.

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Claims 16

Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Biochar-coated urea reduced ammonia volatilization 34% more than conventional urea in clay loam.

Treatment
BCUe0
Outcome
NH 3 volatilizatione0
Direction
reducede0
Value
34%e0
Comparator
OUe0
Setting
clay loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Biochar-coated urea reduced ammonia volatilization 18% more than conventional urea in sandy loam.

Treatment
BCUe0
Outcome
NH 3 volatilizatione0
Direction
reducede0
Value
18%e0
Comparator
OUe0
Setting
sandy loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased biological yield by 142% against CK in clay loam.

Treatment
BCUe2
Outcome
biologicale0
Direction
higheste0
Value
+142%e0
Comparator
CKe0
Setting
clay loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased biological yield by 127% against CK in sandy loam.

Treatment
BCUe2
Outcome
biologicale0
Direction
higheste0
Value
127%e0
Comparator
CKe0
Setting
sandy loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased straw yield by 167% against CK in clay loam.

Treatment
BCUe2
Outcome
strawe0
Direction
higheste0
Value
+167%e0
Comparator
CKe0
Setting
clay loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased straw yield by 153% against CK in sandy loam.

Treatment
BCUe2
Outcome
strawe0
Direction
higheste0
Value
153%e0
Comparator
CKe0
Setting
sandy loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased grain yield by 105% against CK in clay loam.

Treatment
BCUe2
Outcome
grain yielde0
Direction
higheste0
Value
105%e0
Comparator
CKe0
Setting
clay loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased grain yield by 85% against CK in sandy loam.

Treatment
BCUe2
Outcome
grain yielde0
Direction
higheste0
Value
85%e0
Comparator
CKe0
Setting
sandy loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased thousand-grain weight by 34% against CK in clay loam.

Treatment
BCUe2
Outcome
1000‐grain weighte0
Direction
higheste0
Value
+34%e0
Comparator
CKe0
Setting
clay loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

BCU increased thousand-grain weight by 49% against CK in sandy loam.

Treatment
BCUe2
Outcome
1000‐grain weighte0
Direction
higheste0
Value
49%e0
Comparator
CKe0
Setting
sandy loame0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the same treatment yielded highest biological (+142% and 127%), straw (+167% and 153%), grain yield (105% and 85%), and 1000‐grain weight (+34% and 49%) than the CK in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1207–1419 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

BCU produced the highest NUE increase, 75% over CK, in clay loam.

Treatment
BCUe0
Outcome
NUEe0
Direction
highest increasee0
Value
75%e0
Comparator
CKe0
Setting
clay loam soile0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“BCU showing the highest increase in NUE (75%) in clay loam soil and 62% in sandy loam soil relative to CK”

✓ located verbatim in the source · abstract, characters 1644–1749 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

BCU produced a 62% NUE increase over CK in sandy loam.

Treatment
BCUe0
Outcome
NUEe0
Direction
increasee0
Value
62%e0
Comparator
CKe0
Setting
sandy loam soile0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“BCU showing the highest increase in NUE (75%) in clay loam soil and 62% in sandy loam soil relative to CK”

✓ located verbatim in the source · abstract, characters 1644–1749 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

All coated fertilizers enhanced NUE compared with CK.

Treatment
coated fertilizerse0
Outcome
NUEe0
Direction
enhancede0
Comparator
CKe0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“NUE was significantly enhanced in all coated fertilizers compared to CK”

✓ located verbatim in the source · abstract, characters 1566–1637 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Coated urea treatments ranked BCU, SCU, MCU, NCU, OU, CK for physiological and yield parameters.

Outcome
improving plant physiological and yield parameterse0
Direction
improvinge0
Qualifier
BCU > SCU > MCU > NCU > OU > CKe0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the trend of coated urea treatment in improving plant physiological and yield parameters was BCU > SCU > MCU > NCU > OU > CK”

✓ located verbatim in the source · abstract, characters 1430–1554 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Agronomic and recovery NUE ranked BCU, SCU, MCU, NCU, OU, CK in both soils.

Outcome
agronomic and recovery NUE trende0
Qualifier
BCU > SCU > MCU > NCU > OU > CKe0

Not reportedDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“The order of agronomic and recovery NUE trend is expressed as BCU > SCU > MCU > NCU > OU > CK in sandy loam and clay loam soil.”

✓ located verbatim in the source · abstract, characters 1751–1878 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑
Recommendationauthor interpretationoriginal resultpositivebasis n/a

Claim · model-written summary

The authors recommend BCU for minimizing N loss while sustaining productivity.

Outcome
best option among all coated fertilizers to minimize the N losses and balance crop productivity with environmental protectione0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“BCU was suggested as the best option among all coated fertilizers to minimize the N losses and balance crop productivity with environmental protection in diverse soil types”

✓ located verbatim in the source · abstract, characters 1989–2161 · show in text ↑
e1

“wheat crops”

✓ located verbatim in the source · abstract, characters 625–636 · show in text ↑
e2

“BCU significantly reduced NH 3 volatilization up to 34% and 18% more than OU in clay loam and sandy loam soils, respectively”

✓ located verbatim in the source · abstract, characters 1031–1155 · show in text ↑
t0

“Crop Yield”

✓ located verbatim in the source · title, characters 109–119 · show in text ↑
t1

“Coated Fertilizers Enhanced Nitrogen Use Efficiency Through Reducing Ammonia Volatilization While Increasing Crop Yield”

✓ located verbatim in the source · title, characters 0–119 · show in text ↑

nitrogen · nutrient: efficiency · Triticum aestivum (wheat)Results differ

174 papers: 127 positive, 47 negative or no effect

126 papers in the same direction as this paper · 45 in the opposite direction · 2 reporting no difference from an alternative

  1. negative
  2. negative
  3. negative

170 papers more in this group

See all 174 papers →

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

121 papers: 111 positive, 10 negative or no effect

110 papers in the same direction as this paper · 10 in the opposite direction

  1. negative
  2. negative
  3. negative

117 papers more in this group

See all 121 papers →

fertilization · nutrient: efficiency · Triticum aestivum (wheat)Positive and negative results

176 papers: 142 positive, 34 negative or no effect

141 papers in the same direction as this paper · 33 in the opposite direction · 1 reporting no difference from an alternative

  1. negative
  2. negative
  3. negative

172 papers more in this group

See all 176 papers →

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

2,061 papers: 1,737 positive, 324 negative or no effect

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

  1. positive
  2. negative
  3. negative

2,057 papers more in this group

See all 2,061 papers →

biochar · nutrient: efficiency · Triticum aestivum (wheat)Results agree

9 papers: 9 positive, 0 negative or no effect

8 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive

5 papers more in this group

See all 9 papers →

Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.