Biochar without rice husk at 10.0 Mgha -1 produced the highest lettuce yield.

Oryza sativa · yield · Lactuca sativa (garden lettuce)Positive and negative results

3 papers in the same direction as this claim · 1 in the opposite direction

1. no effect
   Cow manure and rice husk ash had no interaction on lettuce growth and yield.

   PERTUMBUHAN DAN HASIL SELADA (Lactuca sativa L.) DENGAN PEMBERIAN PUPUK KANDANG DAN ABU SEKAM PADI DI INCEPTISOL. · 2018

   Opposite direction

2. positive
   Biochar and rice husk treatments significantly increased the number of leaves per lettuce plant compared with the control.

   Mitigating continuous cropping stress in greenhouse lettuce cultivation using organic and inorganic soil amendments · 2025 · compared with control

   Same direction

3. positive
   Rice husk biochar at 1.25 t/ha with 150 kg/ha NPK and at 5 t/ha significantly increased the number of leaves per plant of lettuce compared with 300 kg/ha NPK from 2 to 5 WAT.

   Effect of Rice Husk Biochar and Inorganic Fertilizer on Growth and Yield of Lettuce (Lactuca sativa L.) · 2026 · compared with plants that received 300 kg/ha NPK

   Same direction

4. positive
   Combined biochar and NPK produced taller lettuce with more leaves than NPK alone.

   Effect of Rice Husk Biochar and Inorganic Fertilizer on Growth and Yield of Lettuce (Lactuca sativa L.) · 2026 · compared with 300 kg/ha NPK

   Same direction

biochar · yield · Lactuca sativa (garden lettuce)Results agree

16 papers in the same direction as this claim

1. positive
   Vermicompost or biochar under any irrigation regime, and compost with ETc60, increased postharvest soil K.

   Effect of Irrigation Water and Organic Fertilizer on Reducing Nitrate Accumulation and Boosting Lettuce Productivity · 2022

   Same direction

2. positive
   Biochar added to peat at 10% by volume increased lettuce biomass production by 184–270%.

   The effect of sewage sludge biochar on peat-based growing media · 2016

   Same direction

3. positive
   DBC biochar increased Romaine lettuce yield.

   Taking Advantage of Disposal Bamboo Chopsticks to Produce Biochar for Greenhouse Crop Cultivation · 2024

   Same direction

4. positive
   Integrating biochar with N fertilizer improved lettuce yield.

   Inorganic nitrogen fertilizer, biochar particle size and rate of application on lettuce ( Lactuca sativa L.) nitrogen use and yield · 2022

   Same direction

5. positive
   T5 increased lettuce yield by 64.82%.

   Improvement effects of conditioners on properties of acidified-salinized soils and lettuce growth · 2021

   Same direction

6. positive
   Pure biochar at 30 t/ha increased biomass by 322% versus unfertilized control.

   Impact of the application of biochar previously used in domestic wastewater treatment on the growth of lettuce (Lactuca sativa) · 2022 · compared with unfertilized control

   Same direction

7. positive
   The highest lettuce yield was observed with the 100:0 biochar-mixed organic fertilizer treatment.

   Determination of optimal mixing ratio of organic fertilizer and biochar derived from agricultural waste to increase crop growth and soil carbon sequestration · 2025

   Same direction

8. positive
   Increasing biochar rates increased lettuce growth and yield in pot culture.

   Lettuce production with rates of biochar from babassu palm rachis · 2021

   Same direction

8 papers more in this group