Data/hora: 06/06/2024 00:40:32

Provedor de dados: | 90
País: | Brazil
Título: | Incubation methods for assessing mineralizable nitrogen in soils under sugarcane
Autores: | Mariano,Eduardo; Trivelin,Paulo Cesar Ocheuze; Leite,José Marcos; Megda,Michele Xavier Vieira; Otto,Rafael; Franco,Henrique Coutinho Junqueira.
Data: | 2013-04-01
Ano: | 2013
Palavras-chave: | Saccharum spp.; Net N mineralization; Aerobic incubation; Anaerobic incubation.
Resumo: | Considering nitrogen mineralization (N) of soil organic matter is a key aspect for the efficient management of N fertilizers in agricultural systems. Long-term aerobic incubation is the standard technique for calibrating the chemical extraction methods used to estimate the potentially mineralizable N in soil. However, the technique is laborious, expensive and time-consuming. In this context, the aims of this study were to determine the amount of soil mineralizable N in the 0-60 cm layer and to evaluate the use of short-term anaerobic incubation instead of long-term aerobic incubation for the estimation of net N mineralization rates in soils under sugarcane. Five soils from areas without previous N fertilization were used in the layers 0-20, 20-40 and 40-60 cm. Soil samples were aerobically incubated at 35 ºC for 32 weeks or anaerobically incubated (waterlogged) at 40 ºC for seven days to determine the net soil N mineralization. The sand, silt and clay contents were highly correlated with the indexes used for predicting mineralizable N. The 0-40 cm layer was the best sampling depth for the estimation of soil mineralizable N, while in the 40-60 cm layer net N mineralization was low in both incubation procedures. Anaerobic incubation provided reliable estimates of mineralizable N in the soil that correlated well with the indexes obtained using aerobic incubation. The inclusion of the pre-existing NH4+-N content improved the reliability of the estimate of mineralizable N obtained using anaerobic incubation.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200016
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832013000200016
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.37 n.2 2013
Fonte: | info:eu-repo/semantics/openAccess