| Full text | |
| Author(s): |
Barcelos, Jessica P. Q.
[1, 2]
;
Mariano, Eduardo
[1, 2]
;
Jones, Davey L.
[1]
;
Rosolem, Ciro A.
[2]
Total Authors: 4
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | SOIL BIOLOGY & BIOCHEMISTRY; v. 163, DEC 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 17/02517-1 - Dinâmica do nitrogênio em um sistema de produção usando braquiária como planta de cobertura |
| Grantee: | Eduardo Mariano |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 15/50305-8 - A virtual joint centre to deliver enhanced nitrogen use efficiency via an integrated soil-plant systems approach for the uk & brasil. (fapesp-bbsrc) |
| Grantee: | Ciro Antonio Rosolem |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 17/00398-5 - NITROGEN IN SOIL, PLANT AND ATMOSPHERE AFTER LIMESTONE AND GYPSUM APPLICATION ON NO-TILLAGE SYSTEM |
| Grantee: | Jéssica Pigatto Barcelos Putti |
| Support Opportunities: | Scholarships in Brazil - Doctorate |