381 research outputs found
Critérios técnicos para o licenciamento ambiental da suinocultura.
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Global warming potential and mitigation scenarios with manure treatment in swine farms from Santa Catarina, Brazil.
Estudo técnico da destinação do fertilizante orgânico sólido produzido em uma usina de biogás no município de Concórdia-SC.
Maize nitrogen use efficiency is affected by pig slurry composting and anaerobic digestion.
ABSTRACT: We assessed the nitrogen use efficiency of maize amended with mineral and organic N sources in a Nitisol from Southern Brazil under contrasting soil tillage systems: conventional tillage (CT) and no-tillage (NT). The tested N sources were: 140 kg N ha-1 (total N input) either as mineral fertilizer (urea; MIN), pig slurry (PS), anaerobically digested pig slurry (ADS) and composted pig slurry (CS), besides a control without fertilization (CTR). The N-based application of PS and ADS supplied less than 74% of the maize requirements for P2O5 (115 kg ha-1 ), while CS exceeded P2O5 demand by up to 109%. PS and ADS promoted maize N uptake, biomass production and grain yield similar or higher than maize receiving mineral fertilizer (urea). However, CS promoted significantly lower N agronomic efficiency (AEN) and recovery efficiency (REN) than other fertilizers. CS should be primarily used as a source of P and K or as an amendment to recover SOM stocks in degraded soils
Soil organic carbon pools as affected by tillage systems and organic nitrogen sources.
ABSTRACT: We assessed the impact of organic N sources on total organic carbon (TOC), particulate organic carbon (POC), and mineral-associated organic carbon (MAOC) pools in a Nitisol from Southern Brazil under contrasting soil tillage systems. The tillage systems were conventional tillage (CT) and no-tillage (NT). The tested N sources were: 140 kg N ha-1 (total N input) either as mineral fertilizer (urea; MIN), pig slurry (PS), anaerobically digested pig slurry (ADS) and composted pig slurry (CS), besides a control without fertilization (CTR). TOC stocks decreased by 1.0 and 5.1 Mg C ha-1 after two years of CT in both 0-5 and 0-30 cm soil layers, respectively. NT increased TOC stocks by 2.3 Mg C ha-1 at the soil surface and decrease by 1.7 Mg C ha-1 at the 0-30 cm soil layer. NT had higher POC and MAOC stocks than the CT soil. POC was a more sensitive pool than MAOC in response to soil tillage and fertilization practices. Long-term and continuous assessment of SOC pools is needed for evaluation of the impact of organic N sources for C sequestration in NT soil
Soil organic carbon accumulation in a Mollisol amended with mineral and organic fertilizers under conventional tillage and no-till systems.
Simulating long-term soil carbon dynamics in temperate and subtropical agroecosystems with DSSAT-CENTURY model.
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