Effects of Mineral Fertilizers and Organic Manure Long-Term Application on Carbon Dioxide Emissions from Black Soils in Harbin, China
Carbon dioxide (CO2) is an important greenhouse gas. CO2 emission from different long-term fertilized black soils was investigated by incubation experiment at soil water content of 70% water holding capacity. Maximal CO2 flux was observed at the beginning of 24-h and 48-h incubation after the rewetting of dry soil. Combined fertilizer nitrogen (N), phosphorus (P) with manure (M) emitted the highest CO2-C, was up to 175 mg kg-1. Compared to zero fertilization (CK), fertilizers application increased CO2 emission (P<0.05). Single fertilization N, P and potassium (K) increased CO2 emission 19%, 43% and 22%, respectively. Combined two-way or three-way fertilizer N, P and K also increased CO2 emission. Based on mineral fertilization, additional organic manure application furthered CO2 emission. Two-way fertilizers (NP, NK and PK) application with organic manure increased CO2 emission at the percentage of 398, 13.8 and 29.1, respectively (P<0.05). Although organic manure application ameliorated soil chemical, physical and biological conditions, organic manure fertilization increasing CO2 emission should be considered in agricultural practice.
L. F. Wang et al., "Effects of Mineral Fertilizers and Organic Manure Long-Term Application on Carbon Dioxide Emissions from Black Soils in Harbin, China", Advanced Materials Research, Vols. 255-260, pp. 2925-2929, 2011