Adubação verde : ciclagem de nutrientes e atributos químicos e biológicos em solo cultivado com café orgânico

Abstract

The use of leguminous green manure is used as an alternative for improving the physical, chemical and biological soil. Your use intercropped with coffee in the Pernambucan can provide savings for producers in the region regarding the use of external inputs, and improvement in the quality of the final product. In this context, the study was to evaluate the legumes regarding biomass production, harvesting and soil nutrient cycling, plant, microbial activity and production of organic acids of low molecular weight in soil cultivated with organic coffee. The experiment was conducted in Sitio Sao Jose do Campo in the City of Fulfilled Garanhuns-PE. The experimental design was randomized blocks with 7 treatments: spontaneous vegetation + chicken manure; Calopogonio; Estilosantes; Crotalária; Guandu Dwarf Beans, Soy and Kudzu perennial, and 4 reps. Two cuts were performed to analyze the results, corresponding to 120 and 365 days after sowing. The highest production of dry biomass was obtained pair Calopogonio species, Crotalaria and Guandu Dwarf Bean to 120 Days After Sowing and Estilosantes and Guandu Dwarf Bean at 365 days after sowing. The largest accumulation of nutrients in shoots of Crotalaria legumes were obtained for Estilosantes and at 120 and 365 days after sowing, respectively. The microbial biomass was greater for the species Esilosantes to 120 Days After Sowing and the Perennial Soybean Estilosantes and at 365 days after sowing. The Crotalaria species showed a higher content of labile organic phosphorus at 365 days after sowing. The organic acid of low molecular weight was the predominant propionic acid, which was present in the soil of all treatments evaluated, and its largest concentration observed in the presence of Estilosantes. Organic acids and shikimic isobutyric were detected in shoots of spontaneous vegetation and manure + Calopogonio respectively. In general, the species was Estilosantes that the present improvement in chemical and biological attributes of soil, and its use is recommended for rural Pernambuco.