Fig. 3From: Nitrous oxide emissions and maize yield as influenced by nitrogen fertilization and tillage operations in upland soilRelationships between inorganic N (\({\text{NH}}_{4}^{ + }\) and \({\text{NO}}_{3}^{ - }\)) in soil and daily N2O flux in year 1 and year 2 (***, **, and * denote p < 0.001, p < 0.01, and p < 0.05, respectively)Back to article page