Decomposição e mineralização de nutrientes de fitomassa recalcitrante em função de probióticos, nitrogênio e fósforo.

• Ano de defesa: 2015
• Autor(a) principal: Lima, Lúcia de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Solos e Engenharia Rural; Programa de Pós-Graduação em Ciência do Solo; UFPB
• Palavras-chave em Português: Adubos verdes; Canavalia ensiformis; Recalcitrância; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/15574

For green manure meets the demand for nutrients, the consortium culture, there is the need for the decomposition and release of nutrients from plant residues added to the soil occur in synchronism with the nutrient absorption curve of commercial interest culture. The objective of this study was to evaluate the chemical characteristics of difficult to decompose materials and study the effect of N and P, and the influence of the action of specific microorganisms on the rate of decomposition of recalcitrant material. Six treatments plus the control were tested: T1: Witness (phytomass without inoculants and without the application and NP); T2: phytomass with inoculant Compost-Aid® + Soil Set®; T3: Inoculum EM-1; T4: Compost-Aid®; T5: Nitrogen Application (ammonium nitrate); T6: Match application (phosphate Monopotassium - MKP); and T7: Nitrogen and Phosphorus Application. All applications were made after 45 days of decomposition of the material in the field. The treatments were arranged in a randomized block design with four replications. Each experimental unit consisted of 2.8 x 0.7 x 0.8 m, containing 16 plants vines. The legume was sown by hand and in full bloom, approximately 90 days after plant emergence, were cut to 5 cm above the soil surface. Was removed from a sub-sample of biomass determining the fresh weight and shoot dry, chemical composition and the content and accumulation of nutrients. Since its biomass deposited on the vine planting line, where they were later put the bags of decomposition. To evaluate the decomposition and release of nutrients in situ, after cutting, 600 g samples of shoot residues were packed in 0.3 x 0.3 m nylon bags and disposed on the ground surface in the line of vine. In seven times (0, 8, 30, 45, 60, 60 and 75), which were taken from each bag 20 g of residue, which were dried in an oven at 65 ° C, where it was determined the amount of dry matter and the contents C, N, P, K, Ca, Mg, polyphenols, lignin, cellulose and hemicellulose remaining. The conditions under which the work was carried out it is concluded that: The application of probiotics favored the decomposition of recalcitrant material Canavalia ensiformis; Among the products tested the Compost-Aid® + Soil Set®, proved to be more efficient in the decomposition of recalcitrant material Canavalia ensiformis; The relationship lignin / nitrogen showed an increase due to the decomposition stage of biomass, which may have inhibited the effectiveness of organisms in the degradation of plant material and this suggests that the most highest lignin / nitrogen at the end of the experimental range is related to not 100% decomposition of the deposited biomass; The time has influenced the decomposition of recalcitrant material, as the mineralization of nutrients macronutrients of assessed biomass.