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Do soil carbon sequestration and soil fertility increase by including a gramineous cover crop in continuous soybean?
Resumen
Cover cropping is a farming practice that may improve C sequestration and soil fertility, but these effects can vary under different edaphoclimatic conditions. The effects of including a winter gramineous cover crop (CC) in continuous soybeans were evaluated in three long-term experiments (8 yr) on one coarse-textured soil and two finetextured soils in the Pampas region of Argentina. The impacts of CC on soil C sequestration, soil nutrient availability,
[ver mas...]
Cover cropping is a farming practice that may improve C sequestration and soil fertility, but these effects can vary under different edaphoclimatic conditions. The effects of including a winter gramineous cover crop (CC) in continuous soybeans were evaluated in three long-term experiments (8 yr) on one coarse-textured soil and two finetextured soils in the Pampas region of Argentina. The impacts of CC on soil C sequestration, soil nutrient availability, soil organic C (SOC), and N contents of soil particle size fractions were also determined. The inclusion of CC only increased SOC stock by 3.1 Mg ha-1 in the coarse-textured soil (CTS). The labile C fraction in the 0–5-cm depth increased in both the CTS and the fine-textured soils (FTS) by 263% and 93%, respectively. Soil N also increased in the labile fraction by 119% and 112% when a CC was used in the CTS and FTS soils, respectively. Moreover, the inclusion of a CC decreased soil P availability in one experiment (4.9 kg ha-1) and increased soil manganese in two experiments (11 kg ha-1 on average). The inclusion of a gramineous CC in a soybean monoculture increased the C balance, particularly in coarse-textured soils. Considering that soil N was similarly affected, the C/N ratio was not impacted.
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Autor
Beltran, Marcelo Javier;
Galantini, Juan Alberto;
Salvagiotti, Fernando;
Tognetti, Pedro Maximiliano;
Bacigaluppo, Silvina;
Sainz Rozas, Hernan Rene;
Barraco, Miriam Raquel;
Barbieri, Pablo;
Fuente
Soil Science Society of American Journal (First published: 03 May 2021)
Fecha
2021-04-08
Editorial
Wiley
ISSN
1435-0661
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pdf
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artículo
Proyectos
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INTA/2019-PD-E3-I062-001/2019-PD-E3-I062-001/AR./Estrategias de producción que incrementen el secuestro de C en suelo para la mitigación del Cambio Climático
INTA/2019-PE-E2-I052-001/2019-PE-E2-I052-001/AR./Desarrollo y aplicación de tecnologías para el control de la erosión y degradación de suelos
INTA/2019-RIST-E1-I503-001/2019-RIST-E1-I503-001/AR./Red de ensayos de larga duración
INTA/2019-PE-E1-I011-001/2019-PE-E1-I011-001/AR./Intensificacion Sustentable de la Agricultura en la Region Pampeana
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