Fig 3. Photosynthetic rate (μmol CO₂ m^-2S^-1) and transpiration rate (mmol H₂O m^-2S^-1) affected by biochar application under drought stress at critical growth stages of wheat.

CK, DTS, DFS and DGFS indicates control, drought at tillering, flowering and grain filling stages respectively. BC₀, BC₁ and BC₂ indicates control, 3% and 5% biochar respectively. Error bars indicates standard error (n = 4).