Urban agriculture soils are commonly amended with compost to improve fertility, yet the functional responses of these systems to biochar

The gap

Evidence profile

Sourced from the abstract of the source papers, classified as general, drawn from work published between 2024 and 2026, spanning 8 journals. Those papers have been cited 255 times in total.

Supporting evidence — 8 representative gaps

• Integrated Application of Biochar and Polyacrylamide with Conservation Tillage Promotes Fertilizer-N Recovery in the Short Term (2026) · Agriculture · doi

  Although conservation tillage (CT), polyacrylamide (PAM), and biochar (BC) are each known to enhance soil organic carbon (SOC), their combined short-term effects on SOC sequestration and fertilizer-nitrogen (N) recovery remain unclear.

  generalabstractevidence 5/5
  Keywords: conservation tillage polyacrylamide biochar known enhance soil organic carbon combined short term effects sequestration fertilizer
• Identifying biochar production variables to maximise exchangeable cations and increase nutrient availability in soils (2024) · Journal of Cleaner Production · cited 88× · doi

  However, this influence is not satisfactorily understood due to contrasting data among literature for the cation exchange capacity (CEC) and the lack of standard analysis methods for CEC of biochar and soil-biochar mixtures.

  generalabstractevidence 5/5
  Keywords: biochar influence satisfactorily understood contrasting among literature cation exchange capacity lack standard soil mixtures
• The Effect of Cereal Crop Type on Reducing Emission Intensity With Biochar Application in Monsoon Asia (2025) · Food and Energy Security · doi

  However, whether the effect of biochar application on emission intensity (EI) of non‐CO 2 greenhouse gas emissions (including methane (CH 4 ) and nitrous oxide (N 2 O)), per unit of crop caloric content, varies for different crops and its driving mechanism remains unclear.

  generalabstractevidence 5/5
  Keywords: whether effect biochar application emission intensity greenhouse emissions including methane nitrous oxide unit crop caloric
• Long-term effects of biochar one-off application on soil physicochemical properties, salt concentration, nutrient availability, enzyme activity, and rice yield of highly saline-alkali paddy soils: based on a 6-year field experiment (2024) · Biochar · cited 93× · doi

  However, the long-term effects of one-off biochar application on soil physicochemical properties, salt concentration, nutrient availability, soil enzyme activities, and rice yield under highly saline-alkali paddy soils remain unclear.

  generalabstractevidence 4/5
  Keywords: soil long term effects biochar application physicochemical properties salt concentration nutrient availability enzyme activities rice
• Biochar produced from waste‐based feedstocks: Mechanisms, affecting factors, economy, utilization, challenges, and prospects (2024) · GCB Bioenergy · cited 74× · doi

  Given its widespread use in carbon sequestration, soil remediation, wastewater purification, and organic waste composting, the mechanisms of biochar production in environmental usage need to be investigated.

  generalabstractevidence 4/5
  Keywords: given widespread carbon sequestration soil remediation wastewater purification organic waste composting mechanisms biochar production environmental
• Biochar‐Mediated Controlled Release of Mineral Nitrogen From Urea Enhances Wheat Yield in Low Fertility Alkaline Soil (2026) · Journal of Plant Nutrition and Soil Science · doi

  Although biochar has been widely studied as a nutrient‐retentive soil amendment; however, its potential to assist fertilizer reduction under alkaline soil conditions remains insufficiently understood.

  generalabstractevidence 4/5
  Keywords: soil biochar widely studied nutrient retentive amendment potential assist fertilizer reduction alkaline conditions remains insufficiently
• Combined manure–biochar effects on soil carbon status and grain nutritional quality in an organic paddy system in Bac Ninh, Vietnam (2026) · Environmental Research Communications · doi

  Field evidence is still limited on how locally available manure and rice husk biochar jointly affect soil carbon status, biological soil indicators, yield formation and nutritionally relevant grain traits in transitional organic rice systems.

  generalabstractevidence 4/5
  Keywords: rice soil field evidence still limited locally available manure husk biochar jointly affect carbon status
• Biochar application rate regulates soil microbial processes and nutrient dynamics in compost-amended urban agricultural soils (2026) · Frontiers in Soil Science · doi

  Urban agriculture soils are commonly amended with compost to improve fertility, yet the functional responses of these systems to biochar additions across application rates remain poorly understood.

  generalabstractevidence 2/5
  Keywords: urban agriculture soils commonly amended compost improve fertility functional responses systems biochar additions across application

Questions about this gap