Publication Date:
2019
Description:
Abstract
Soybean (Glycine max (L.) Merr.) monoculture can lead to a decrease in labile fractions of soil organic carbon (SOC). This study sought to evaluate the effects of cover crops (CC), application of fertilizer, and crop rotation on SOC, particulate organic carbon (POC), and soil carbon input in soybean‐based crop sequences under a no‐till cropping system in the Argentinean Humid Pampa. Five crop sequences at two sites differing in initial SOC were evaluated: continuous soybean (Sb), continuous soybean fertilized with phosphorus (P) and sulfur (S) (Sbf), grass CC / PS‐fertilized soybean (CC/Sbf), nitrogen (N)‐fertilized CC / PS‐fertilized soybean (CCf/Sbf) and NPS‐fertilized crop rotation with high intensification sequence index (ISI) (Rot). At 0‐5 cm, SOC and POC were higher (p〈0.05) in the sequences with higher residue‐C supply (CC/Sbf; CCf/Sbf and Rot) at both sites. Changes in SOC at 0‐20 cm simulated by AMG model closely tracked measured results at 0‐20 cm. Findings from this study suggest that, the inclusion of CC or crop rotation with high ISI improved C balance in soils under crop sequences with soybean predominance.
Print ISSN:
0266-0032
Electronic ISSN:
1475-2743
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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