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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Barcelos, Jessica P. Q. [1, 2] ; Mariano, Eduardo [1, 2] ; Jones, Davey L. [1] ; Rosolem, Ciro A. [2]
Total Authors: 4
[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

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 - Nitrogen dynamics in a production system using Brachiaria as a cover plant
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 & Brazil
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 de Queiroz Barcelos
Support Opportunities: Scholarships in Brazil - Doctorate