| Full text | |
| Author(s): |
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 |
| Abstract | |
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: | 11/14372-1 - Soil nitrogen mineralization as predictor of sugarcane n fertilizer requirements |
| Grantee: | Paulo Cesar Ocheuze Trivelin |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Regular Program Grants |
| 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 Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 08/56147-1 - Nitrogen nutrition of sugarcane with fertilizers or diazotrophic bacteria |
| Grantee: | Heitor Cantarella |
| Support Opportunities: | 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 Opportunities: | Research Projects - Thematic Grants |