Mobilidade dos íons nitrato e amônio em área agrícola sob adubação com água residuária de bovinocultura de leite e torta de Mamona
Arquivos
Data
2017-08-07
Autores
Silva, Jonathas Batista Gonçalves
Martinez, Mauro Aparecido
Matos, Antônio Teixeira de
Pires, Carina Soares
Terração, Geuzimar
Título da Revista
ISSN da Revista
Título de Volume
Editor
Engenharia na Agricultura
Resumo
Objetivou-se, neste trabalho, avaliar a mobilidade dos íons nitrato e amônio em um Argissolo Vermelho-Amarelo, quando aplicado água residuária de bovinocultura de leite (ARB) e torta
de mamona. O experimento foi conduzido no Sistema Integrado de Produção Agroecológica, localizado no município de Seropédica, Rio de Janeiro. Na área utilizada nesse trabalho é
cultivada a figueira (Ficuscarica L.), variedade Roxo de Valinhos. Diferentes lâminas de ARB foram aplicadas no solo como fonte de adubação de nitrogênio (Adubação 1- 0% de ARB e adubação complementar com torta de mamona; Adubação2- 50% da dose de N recomendada fornecida pela ARB e os outros 50% com a torta de mamona; Adubação 3- 75% da dose de N recomendada fornecida pela ARB e os outros 25% fornecido pela torta de mamona; Adubação4- 100% da dose de N recomendada fornecida pela ARB). Nas parcelas experimentais foram instalados extratores a 0,15 e a 0,60 m de profundidade. As concentrações de nitrato obtidas foram muito elevadas, com valores de até 323 mg.L -1 . No entanto, os valores do amônio na solução do solo foram baixos, com valores abaixo de 0,44
mg.L -1 . Os resultados indicam a necessidade de um rigoroso monitoramento no uso de ARB e torta de mamona em áreas agrícolas.
The aim of this study was to evaluate the mobility of nitrate and ammonium ions in an Ultisol when applied dairy cattle wastewater (ARB). The experiment was conducted in the Agroecological Production Integrated System, located in Seropédica, Rio de Janeiro. Fig (Ficuscarica L.) crop of the variety Roxo de Valinhos is grown in the area used during this work. Different blades of ARB were applied to the soil as a source of nitrogen fertilization (T1-0% of ARB and additional fertilizers with castor bean cake, T2-50% of the recommended dose of N supplied by the ARB and the other 50% with the castor bean cake, T3-75% of the recommended dose of N supplied by the ARB and the other 25% provided by the castor bean cake, T4-100% of recommended dose of N provided by the ARB). In the experimental plots, extractors were installed at 0.15 and 0.60 m of depth. Nitrate concentrations obtained were very high, with values up to 323 mg.L - 1 . However, the values of ammonium in the soil solution were low, with values below 0.44 mg L -1 . The results indicate the need for close monitoring when ARB and castor bean cake are used in agricultural areas.
The aim of this study was to evaluate the mobility of nitrate and ammonium ions in an Ultisol when applied dairy cattle wastewater (ARB). The experiment was conducted in the Agroecological Production Integrated System, located in Seropédica, Rio de Janeiro. Fig (Ficuscarica L.) crop of the variety Roxo de Valinhos is grown in the area used during this work. Different blades of ARB were applied to the soil as a source of nitrogen fertilization (T1-0% of ARB and additional fertilizers with castor bean cake, T2-50% of the recommended dose of N supplied by the ARB and the other 50% with the castor bean cake, T3-75% of the recommended dose of N supplied by the ARB and the other 25% provided by the castor bean cake, T4-100% of recommended dose of N provided by the ARB). In the experimental plots, extractors were installed at 0.15 and 0.60 m of depth. Nitrate concentrations obtained were very high, with values up to 323 mg.L - 1 . However, the values of ammonium in the soil solution were low, with values below 0.44 mg L -1 . The results indicate the need for close monitoring when ARB and castor bean cake are used in agricultural areas.
Descrição
Palavras-chave
Deslocamento miscível, Disposição final de efluentes, Lençol freático