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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

INCUBATION METHODS FOR ASSESSING MINERALIZABLE NITROGEN IN SOILS UNDER SUGARCANE

Texto completo
Autor(es):
Mariano, Eduardo [1] ; Ocheuze Trivelin, Paulo Cesar [2] ; Leite, Jose Marcos [1] ; Vieira Megda, Michele Xavier [1] ; Otto, Rafael [2] ; Junqueira Franco, Henrique Coutinho [3]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Sao Paulo, CENA, BR-13416000 Piracicaba, SP - Brazil
[3] Brazilian Ctr Res Energy & Mat, Brazilian Bioethanol Sci & Technol Lab, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Revista Brasileira de Ciência do Solo; v. 37, n. 2, p. 450-461, MAR-APR 2013.
Citações Web of Science: 9
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 degrees C for 32 weeks or anaerobically incubated (waterlogged) at 40 degrees C 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. (AU)

Processo FAPESP: 09/04691-2 - Mineralização e disponibilidade de nitrogênio em solos cultivados com cana-de-açúcar
Beneficiário:Eduardo Mariano
Linha de fomento: Bolsas no Brasil - Mestrado