Dynamics of Microbial Biomass, Nitrogen Mineralization and Crop Uptake in Response to Placement of Maize Residue Returned to Chinese Mollisols over the Maize Growing Season

Returning residue to soils is not only an effective nutrient management method, but also can reduce the air pollution caused by burning, which has become important factor in global warming. However, it clear whether returning soil affect nitrogen mineralization and cycle process, environmental impact loss gaseous forms. Therefore, a pot experiment was conducted study effects of placement on turnover including microbial biomass N (MBN) C (MBC), inorganic N, crop uptake, contribution residue-derived maize at different growth stages. Three treatments were assessed: no addition (T0), surface (T1), incorporation into 0–10 cm layer (T2). Soil samples taken 0–5 5–10 layers for all treatments. Residue retention (T1 T2) significantly affected MBC MBN contents decreased MBC/MBN ratio markedly increased R1 stage compared other The differences total (TIN) attributed balance net immobilization In addition, T2 source 11.3% T0 R3 stage. Overall, relative T1, better agriculture measure promote transformation supply, enhance release uptake maize.