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Effect of cumulative nitrogen fertilization on sugarcane (Saccharum spp.) cropped soils

Grant number: 14/02604-3
Support type:Scholarships in Brazil - Master
Effective date (Start): June 01, 2014
Effective date (End): July 31, 2015
Field of knowledge:Agronomical Sciences - Agronomy
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Rafael Otto
Grantee:Thales Meinl Schmiedt Sattolo
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

Nitrogen fertilizers interpret an important role in nutrition and increased yield of various crops, especially for sugarcane. Nitrogen fertilizers application causes series of changes in the chemical and biological properties due to their participation in the various microbiological soil processes, mainly related to the C and N cycle. This work aims to evaluate the effect of accumulated fertilizer nitrogen, in the mineral and organic forms, in the long-term soil nitrogen transformation processes, and carbon and nitrogen stock. Soil samples set will be collected in two experiments carried out in 2010 and 2011, which was adopted in the statistical design in randomized blocks with 6 treatments and 4 replications. The treatments applied in the implementation of the experiments and annually reapplied were T1 (control, without N fertilizer), T2 fertilization with organic compound (100 kg ha-1 N), T3, T4, T5 and T6 with doses of 50, 100, 150 and 200 kg ha-1 N, respectively. Annual soil samplings were performed in these experiments in the layers 0-20 and 20-40 cm, in which will be analyzed the variation in parameters of soil fertility and the content of hydrolysable organic N (ISNT). To evaluate the nitrogen fertilization effects on the N transformation processes in soil, samples will be collected in 2014 to 1.0 m depth in detail, in which we will be determined the content of organic C, total N and mineral N (N-NH4+ and N-NO3- + N-NO2-), as well as soil density. These samples will also be used in the incubation experiment in laboratory, assessing the potential of N mineralization and soil microbial processes through assessments of microbial biomass and basal respiration. (AU)

Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SATTOLO, Thales Meinl Schmiedt. Nitrogen fertilization in sugarcane: effects on soil fertility, microbial transformations and stocks of carbon and nitrogen. 2016. Master's Dissertation - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz Piracicaba.

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