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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.)

Topsoil and subsoil C and N turnover are affected by superficial lime and gypsum application in the short-term

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Autor(es):
Barcelos, Jessica P. Q. [1, 2] ; Mariano, Eduardo [1, 2] ; Jones, Davey L. [1] ; Rosolem, Ciro A. [2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Bangor Univ, Sch Nat Sci, Bangor LL57 2UW, Gwynedd - Wales
[2] Sao Paulo State Univ, Dept Crop Sci, Sch Agr, Av Univ 3780, BR-18610034 Botucatu, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: SOIL BIOLOGY & BIOCHEMISTRY; v. 163, DEC 2021.
Citações Web of Science: 0
Resumo

Alleviation of subsoil acidity with lime or gypsum increases carbon (C) accumulation in deep layers by stimulating root growth and C and nitrogen (N) inputs at depth. However, the effects of these amendments combined with N fertilization on soil CO2 emissions remain controversial. We evaluated the effects of superficial lime and gypsum application and N-fertilizer on C and N dynamics and microbial C use efficiency (Mic(CUE)) in samples taken from the topsoil (0-10 cm) and subsoil (40-60 cm) of a no-till field experiment carried out in Brazil. We performed a short-term laboratory incubation with C-14-glucose and C-14-arginine to assess C and N mineralization dynamics. Liming increased topsoil pH but had no effect on subsoil acidity. A higher content of organic C, total N, and microbial biomass C and N were found in the topsoil. The addition of soil corrective (lime and gypsum) and N fertilizer had no effect on Mic(CUE) of added C-14-glucose. However, the Mic(CUE) of C-14-arginine was affected by the soil layer, and was higher in the subsoil. After the addition of arginine, net NH4+-N production was highest in the topsoil control, while net NO3--N content was highest with lime + gypsum plus residual N in the same layer. We conclude that while lime and gypsum ameliorate soil acidity, they have minimal effect on C cycling through the microbial biomass, particularly in the subsoil. (AU)

Processo FAPESP: 17/02517-1 - Dinâmica do nitrogênio em um sistema de produção usando braquiária como planta de cobertura
Beneficiário:Eduardo Mariano
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 15/50305-8 - A virtual joint centre to deliver enhanced nitrogen use efficiency via an integrated soil-plant systems approach for the UK & Brazil
Beneficiário:Ciro Antonio Rosolem
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 17/00398-5 - Nitrogênio no solo, planta e atmosfera após aplicação de calcário e gesso em sistema de semeadura direta
Beneficiário:Jéssica Pigatto de Queiroz Barcelos
Modalidade de apoio: Bolsas no Brasil - Doutorado