Biomassa de tefr?sia como fonte de adubo nitrogenado no cultivo do maracujazeiro em sistema org?nico de produ??o

• Ano de defesa: 2021
• Autor(a) principal: Fogel, Jo?o Fernandes
• Orientador(a): Ara?jo, Ednaldo da Silva
• Banca de defesa: Ara?jo, Ednaldo da Silva, Rosa, Raul Castro Carriello, Xavier, Francisco Alisson da Silva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Rural do Rio de Janeiro
• Programa de Pós-Graduação: Programa de P?s-Gradua??o em Agricultura Org?nica
• Departamento: Instituto de Agronomia
• País: Brasil
• Palavras-chave em Português: Maracujazeiro; Aduba??o verde; Agricultura org?nica
• Palavras-chave em Inglês: Passion Fruit; Green Manure; Organic Agriculture
• Área do conhecimento CNPq: Agronomia
• Link de acesso: https://tede.ufrrj.br/jspui/handle/jspui/5847

Passion fruit is a crop of great economic importance for Brazil. The country present itself as the major world producer of the fruit and also the major consumer. Lately, it is observed the growth of studies with genetic materials cultivated under organic management of passion-fruit crop cultures, what equally indicates the necessity of works focusing over the following the fertilization with organic sources attending nutritional requirements of the culture. Tephrosia sinapou is a shrub legume with potential for green manure and it is being almost not explored in the country. In this study was evaluated 1) Tephrosia vegetable biomass capacity as fertilizer for attending the nitrogen (N) demand for the passionfruit culture in organic production system, and 2) the decomposing rate and nitrogen (N) release from it?s biomass. The experiment was conducted in the Fazendinha Agroecol?gica Km 47, in the Serop?dica region conditions. For the first evaluated parameter it was adopted the randomized block design (RBD) with 4 treatments, 3 blocks and 3 repetitions. Where: Treatment 1 (T1) ? witness (without fertilization); Treatment 2 (T2) ? castor bean pie (CBP); Treatment3 (T3) ? Tephrosia fresh biomass (TFB); Treatment 4 (T4) a combination of 50% castor bean pie + 50% Tephrosia fresh biomass (CBP +TFB). In the second evaluated parameter, in relation to the determination of vegetable biomass decomposing of different parts of the plant (leaf, stalk, leaf + stalk) using litter bag methodology. It was adopted RBD and each distinct material considered a treatment, being 3 treatments, 3 blocks and 10 repetitions. The obtained results in this study demonstrated that the distinct parts of the plant presented distinct nitrogen decomposing and release times in function of C/N relation, being that as greater the C/N relation, greater were half-life (t1/2) times of the dry matter, being the leaf fraction with the minor half life time (38 days), followed by the leaft + stalk material (66 days) and the stalk (150 days). The half-life time nitrogen release of the leaf was the minor (29 days), followed by leaf + stalk material (38 days) and stalk (102 days). The castor bean pie (T2), for being a small C/N relation compost and quick nitrogen release, was the treatment with major total productivity (13,37 t ha-1), producing around 14% more than the witness treatment (11,5 t ha-1), 27% more than the treatment with Tephrosia biomass (9,7 t ha-1) e 10% more than the treatment with the mixture of castor bean pie (CBP) with Tephrosia (T4). The fertilization with Tephrosia biomass (T3) obtained productivity reduction around 15%, when compared with the witness treatment (T1), suggesting a lack of nitrogen for the sour passion-fruit cultivar of this treatment with the leguminous biomass, maybe due to the nitrogen immobilization in soil. The fertilization did not influence in the soluble solids content (oBrix).