[Effects of Biochar Amendment and Irrigation on Denitrification Losses in Greenhouse Tomato Fields].

Biochar addition and irrigation are normal farm practices for tomatoes management, while their impacts on denitrification are less known. In this study, three irrigation treatments(hereafter main plots)were set as 50% (W50%), 75% (W75%) and 100% (W100%) of reference evapotranspiration (ET), and the subplots coupled three biochar treatments at the rates of 0 (B0), 25 t·hm (B25) and 50 t·hm (B50). Typical soil samples in each plot were collected when tomatoes were harvested in 2014 and 2015.