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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

INCUBATION METHODS FOR ASSESSING MINERALIZABLE NITROGEN IN SOILS UNDER SUGARCANE

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Author(s):
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]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Revista Brasileira de Ciência do Solo; v. 37, n. 2, p. 450-461, MAR-APR 2013.
Web of Science Citations: 9
Abstract

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)

FAPESP's process: 09/04691-2 - Nitrogen mineralization and availability in soils cropped with sugarcane
Grantee:Eduardo Mariano
Support type: Scholarships in Brazil - Master