Influence of mineral and organic fertilizers on soil organic carbon pools |
| |
Authors: | Sándor Hoffmann Elke Schulz Gábor Csitári László Bankó |
| |
Affiliation: | 1. University of Veszprém, Georgikon Faculty of Agronomy Keszthely , Hungary hoffmann-s@georgikon.hu;3. UFZ Centre for Environmental Research Leipzig-Halle Ltd. , Germany;4. University of Veszprém, Georgikon Faculty of Agronomy Keszthely , Hungary |
| |
Abstract: | Abstract The influence of farmyard manure (FYM) and equivalent mineral NPK application on organic matter content, hot water extractable carbon (HWC), microbial biomass C (Cmic), and grain yields in a long-term field experiment was assessed after 40 years in Hungary. The unfertilized plot, FYM fertilized plots and plots fertilized with equivalent NPK fertilizer contained 0.99%, 1.13% and 1.05% total organic carbon (TOC) respectively. Compared to the unfertilized plot, FYM application resulted in 8.2% higher TOC than equivalent NPK fertilization. The highest TOC was only 1.21%, much lower than expected for a soil containing 21.3% of clay. The quantity of HWC varied depending on the type of fertilization: Compared to control, FYM treatments lead to 29% more HWC than mineral fertilization (FYM: 328 mg kg?1; NPK: 264 mg kg?1). The impact of FYM and equivalent NPK fertilizer on Cmic was contrary. FYM and NPK resulted in 304 and 423 mg kg?1 Cmic, respectively. The difference was 119 mg kg?1; 42% as compared to the unfertilized plot. Despite the higher HWC content, FYM treatments lead to significantly less (35%) grain yields than equivalent NPK doses; Cmic content showed closer correlation to grain yields. |
| |
Keywords: | FYM hot water soluble-C microbial biomass grain yields long-term experiment |
|
|