Long-term N fertilization reduces uptake of N from fertilizer and increases the uptake of N from soil

Autor(es)

Joris, Helio Antonio Wood ^[1] ; Vitti, Andre Cesar ^[2] ; Ferraz-Almeida, Risely ^[3] ; Otto, Rafael ^[3] ; Cantarella, Heitor ^[4]

Afiliação do(s) autor(es)

^[1] ABC Fdn, Rodovia PR 151, BR-84166981 Castro, PR - Brazil

^[2] Agribusiness Technol Paulista Agcy APTA, Rua Sao Jorge, 283 Santana, BR-13411516 Piracicaba, SP - Brazil

^[3] Univ Sao Paulo, Dept Soil Sci, Luiz de Queiroz Coll Agr, Ave Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[4] Agron Inst Campinas, Ave Barao de Itapura, 1481 Botafogo, BR-13020902 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 10, n. 1 NOV 2 2020.
• Citações Web of Science: 0

Resumo

Long-term supply of synthetic nitrogen (N) has the potential to affect the soil N processes. This study aimed to (i) establish N response curves to find the best balance between inputs and outputs of N over four ratoons; (ii) use N-15-labeled fertilizer to estimate the N recovery efficiency of fertilizer applied in the current season as affected by the N management in the previous three years. Nitrogen rates (control, 60, 120, and 180 kg ha(-1) N) were applied annually in the same plots after the 1st, 2nd, 3rd, and 4th sugarcane cycles. Sugarcane yield, N uptake, and N balance were evaluated. In the final season, 100 kg ha(-1) of N-15 was also applied in the microplots to evaluate the effect of previous N fertilization on N derived from fertilizer (NDF) and N derived from soil (NDS). Sugarcane yields increased linearly with the N rates over the four sugarcane-cycles. The best balance between the input of N through fertilizer and N removal by stalks was 90 kg ha(-1) N in both the 1st and 2nd ratoons, and 71 kg ha(-1) N in both the 3rd and 4th ratoons. Long-term application of N reduced NDF from 41 to 30 kg ha(-1) and increased NDS from 160 to 180 kg ha(-1) N. A key finding is that long-term N fertilization has the potential to affect soil N processes by increasing the contribution of soil N and reducing the contribution of N from fertilizer. (AU)

• Processo FAPESP: 08/56147-1 - Nutrição nitrogenada de cana-de-açúcar com fertilizantes ou bactérias diazotróficas
• Beneficiário: Heitor Cantarella
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático
• Processo FAPESP: 17/25566-8 - Desenvolvimento de fertilizante nitrogenado para aumento da eficiência de uso do N em cana-de-açúcar
• Beneficiário: Rafael Otto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/20793-9 - Inibidores de nitrificação e urease como estratégias de mitigação das Emissões de N2O e volatilização de NH3 em áreas de cultivo de cana-de-açúcar com adição de resíduos orgânicos
• Beneficiário: Heitor Cantarella
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular