Straw burial depth and manure application affect the straw-C and N sequestration: Evidence from 13C & 15N-tracing

Abstract Straw return to farmlands has great potential to increase C sequestration and decrease its losses. Combined influences of straw burial depth and manure application are important factors which determines the decomposition or retention of straw C and N in the soil profile. The influence of straw amendment on soil-derived C and N is not well- known in the presence of manure application with at different straw burial depths. In a 360-day field study an in situ 13C & 15N-tracing technique was used to elucidate the effects of straw burial depth (15 and 35 cm), manure (presence or absence) and their interaction on C and N sequestration. Soil organic carbon (SOC) and total nitrogen (TN) contents were significantly (P