Influence of Nitrogen Form Supply on Soil Mineral Nitrogen Dynamics, Nitrogen Uptake, and Productivity of Sugarcane

Autor(es)

Mariano, Eduardo ^[1] ; Leite, Jose M. ^[1] ; Megda, Michele X. V. ^[2] ; Torres-Dorante, Luis ^[3] ; Trivelin, Paulo C. O. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Soil Sci, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Lab Stable Isotopes, Ctr Nucl Energy Agr, BR-13400970 Piracicaba, SP - Brazil

^[3] Yara Int ASA, Res Ctr Hanninghof, D-48249 Dulmen - Germany

• Tipo de documento: Artigo Científico
• Fonte: AGRONOMY JOURNAL; v. 107, n. 2, p. 641-650, MAR-APR 2015.
• Citações Web of Science: 14

Resumo

Current limitations on the use of conventional N fertilizers on sugarcane (Saccharum spp.) in Brazil require the search for alternative sources with adequate N use efficiency. Field experiments were conducted in Typic Hapludox (TH) and Typic Eutrustox (TE) soils in Sao Paulo State, Brazil, to evaluate the dynamics of soil mineral N, N uptake, and sugarcane yield in response to N amendments including Ajifer-8, ammonium chloride, ammonium nitrate, calcium ammonium nitrate (CAN), and urea applied on sugarcane ratoon at 100 kg N ha(-1). The experiments were arranged in randomized complete block design, with four replications. The treatments were applied at 105 and 122 days a after harvest of plant cane (DAH) in the TH and TE soil. Ajifer-8 exhibited higher NH4+-N availability in the 0- to 20-cm soil layer 139 DAH in the TH soil. Ammonium nitrate and CAN resulted in the highest NO3--N values in the soil within the same period. In the TE soil, the soil mineral N content remained unaltered during all of the sampling dates. The high values of accumulated N uptake by sugarcane in both soils indicates that a good portion of the soil mineral N was take up by the plants. The Ajifer-8 and CAN fertilizers resulted in higher sugarcane yield in both experiments, and may be used as replacement for conventional N sources. In contrast, the use of ammonium chloride resulted in low values of soil mineral N and accumulated N uptake. (AU)

• Processo FAPESP: 09/10192-9 - Eficiência agronômica de fontes nitrogenadas aplicadas em soqueira de cana-de-açúcar colhida mecanicamente
• Beneficiário: Michele Xavier Vieira Megda
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/12537-3 - Acúmulo de fitomassa e de nutrientes em cana-de-açúcar (cana soca) relacionados a fontes de nitrogênio no sistema sem queima
• Beneficiário: José Marcos Leite
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 09/04691-2 - Mineralização e disponibilidade de nitrogênio em solos cultivados com cana-de-açúcar
• Beneficiário: Eduardo Mariano
• Modalidade de apoio: Bolsas no Brasil - Mestrado