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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effect of previous soil management on sugarcane response to nitrogen fertilization

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Autor(es):
Otto, Rafael [1] ; Mariano, Eduardo [2] ; Mulvaney, Richard Lesley [3] ; Khan, Saeed Ahmad [3] ; Boschiero, Beata Nastaro [2] ; Tenelli, Sarah [1] ; Ocheuze Trivelin, Paulo Cezar [2]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, ESALQ, Dept Ciencia Solo, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Sao Paulo, CENA, Lab Isotopos Estaveis, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil
[3] Univ Illinois, Dept Nat Resources & Environm Sci, 1102 S Goodwin Av, Urbana, IL 61801 - USA
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Scientia Agricola; v. 76, n. 1, p. 72-81, JAN-FEB 2019.
Citações Web of Science: 0
Resumo

N Fertilizer recommendations must be improved to optimize N use efficiency (NUE) for bioenergy crops. A study was conducted to test the hypothesis that sites varying in historical usage of by-product differ in soil N-supplying power and sugarcane (Saccharum spp.) responsiveness to N fertilization. Our aim was to quantify soil N availability and N fertilizer rates, sources, and application timings for their effects on sugarcane yield and NUE. Three N response trials, each involving 0 to 200 kg N ha(-1), were conducted in the state of Sao Paulo, Brazil, at sites varying historically in the usage of vinasse. Before fertilizer application and at harvest, soil inorganic N content was quantified and potential N mineralization estimated by the Illinois Soil Nitrogen Test (ISNT); stalk yield and sugar content were measured at harvest and used to estimate NUE. Sugarcane showed significant response to N fertilization only at the sites with no history of vinasse usage. Reducing the N rate from 120 to 80 kg N ha(-1) showed limited potential for lowering yield (similar to 1 %), while increasing the NUE by 54 %, which was far better than the 14 % increase achieved by modifying the N source or application timing. Monitoring inorganic N and ISNT levels over time to estimate soil N-supplying power has potential for predicting the responsiveness of sugarcane to N fertilization; however, ISNT interpretations must consider factors that impede mineralization or crop N utilization, such as soil acidity or a limitation on the availability of Ca or P. Soil N testing can help optimize NUE for sustainable bioenergy production. (AU)

Processo FAPESP: 11/22660-7 - Avanços metodológicos no estudo das transformações do nitrogênio do solo para a produção de cana-de-açúcar
Beneficiário:Rafael Otto
Linha de fomento: Bolsas no Brasil - Pós-Doutorado