[Effect of Long-Term Biochar Application on Soil Respiration in Flue-Cured Tobacco Planting Fields in Henan Province].

A five year (2013-2017) experiment was conducted to explore the effects of biochar application on the dynamic changes in soil respiration, soil water, and heat factors under four treatments:CK (without biochar), T1 (with 1.5 t·hmbiochar), T2 (with 15 t·hmbiochar), and T3 (with 45 t·hmbiochar). The results showed that:① the soil respiration rate in the growing season of flue-cured tobacco was significantly reduced by 25.