| Texto completo | |
| 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 Barcelos Putti |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |