Effect of Nitrification Inhibitor Addition on Rice N Utilization and Soil Bacterial Community

Abstract

Clarifying the contribution of soil and fertilizer nitrogen (N) to rice N uptake is crucial to understand the synergistic mechanism of nitrification inhibitors (NI) and formulate the application strategy. Herein, four typical hydromorphic paddy soils, two origins with two soil fertilites for each origin, were selected for the pot experiment, with two treatments: (a) conventional split fertilization with 15 N-labeled urea and (b) combined with NI (2-chloro-6-(trichloromethyl)-pyridine (CP)). We found that CP addition significantly increased 16.92% rice yield and 19.86% N uptake than the control, which was not affected by soil type. The variables of inorganic N in paddy water, soil inorganic N..