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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.)

Soil nitrogen availability indices as predictors of sugarcane nitrogen requirements

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Mariano, Eduardo ; Otto, Rafael ; Montezano, Zaqueu F. ; Cantarella, Heitor ; Trivelin, Paulo C. O.
Total Authors: 5
Document type: Journal article
Source: EUROPEAN JOURNAL OF AGRONOMY; v. 89, p. 25-37, SEP 2017.
Web of Science Citations: 6

Nitrogen recommendation systems for sugarcane (Saccharum spp.) generally does not consider the N supply from soil. Identifying a reliable soil test for estimating N availability is crucial to avoid yield losses or environmental pollution. Therefore, the objective of this study was to correlate and calibrate N availability indices with field based measures of soil N supply. Between 2006 and 2013, 15 trials for rate-response to N fertilizer by sugarcane ratoons were performed in sao Paulo, the main sugarcane-producing state in Brazil. The following indices were tested: KMnO4 oxidizable C, hot KCl extractable N, phosphate borate buffer distillable N, NaOH distillable N, Illinois Soil N Test, organic C, total N, mineral N, anaerobic incubation, soil respiration, substrate induced respiration, microbial biomass C, metabolic quotient, microbial quotient, and gross N mineralization. The indices were then correlated with sugarcane yield (Y-0N) and N content of the crop (N-0N) in N unfertilized plots, relative yield (RY), and the N rate predicted to achieve 90% of the RY (NR 90%RY). Although weak correlations were found between Y-0N with anaerobic incubation, total N, and soil respiration, as well as between NON and anaerobic incubation, no index correlated with RY or NR 90%RY. Grouping sites based on soil texture or byproduct management did not improve prediction of RY. Therefore, we concluded that none of the fifteen laboratory indices is a reliable predictor of soil N supply, and hence could not be used to adjust N fertilization rate for sugarcane. (AU)

FAPESP's process: 11/07955-0 - Predicting nitrogen fertilizer needs for sugarcane and reactions of dissolved organic and mineral nitrogen in straw and soil from sugarcane fields
Grantee:Eduardo Mariano
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 11/14372-1 - Soil nitrogen mineralization as predictor of sugarcane n fertilizer requirements
Grantee:Paulo Cesar Ocheuze Trivelin
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 08/56147-1 - Nitrogen nutrition of sugarcane with fertilizers or diazotrophic bacteria
Grantee:Heitor Cantarella
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 02/10534-8 - Sugar cane yield in subsequent cycles associated to the residual effect of N and S and their transformations in the soil, on conservation system
Grantee:Paulo Cesar Ocheuze Trivelin
Support type: Research Projects - Thematic Grants